Top 10 Best 160mm Brake Rotor Deals You Can’t Miss!

Choosing the right brake rotor can make a big difference in your bike’s performance and safety. When your current rotors wear out or don’t provide enough stopping power, finding a reliable replacement becomes a priority.

This product is ideal for those who need a balance between effective heat dissipation and strong braking force on various types of bikes, including mountain and road models. You can expect improved control and reduced brake fade without adding unnecessary weight.

This review will cover the features, compatibility, and build quality of several leading 160mm brake rotors on the market. It will help you make a well-informed decision based on your specific riding needs and conditions.

Top Picks to Maximize Your Bike’s Stopping Power and Performance

Image	Product	Price
Our Recommended 1	Teyssor 140mm 160mm 180mm 203mm Bike Disc Brake Rotor with	Check Price
Our Recommended 2	Teyssor 140mm 160mm 180mm 203mm Bike Disc Brake Rotor with	Check Price
Our Recommended 3	2Pcs 160mm Disc Brake Rotor Stainless Steel Bike Disc Brake	Check Price

1. Teyssor 140mm 160mm 180mm 203mm Bike Disc Brake Rotor with

Experience precision and reliable stopping power with the Teyssor Bike Disc Brake Rotor. Designed to provide smooth braking performance, this rotor is perfect for riders seeking efficient control on varied terrains.

Offering multiple size options, including the 160mm diameter, this rotor fits a wide range of bike models. The vibrant, colorful design adds a touch of style while maintaining high functionality for daily rides and demanding conditions.

The Teyssor 160mm Bike Disc Brake Rotor comes complete with six screws, making installation straightforward. Measuring 160mm in outside diameter with a 44mm center distance, it strikes a balance between responsiveness and heat dispersion. Its

Its 9mm thickness helps maintain structural integrity while keeping weight low at just 122 grams per piece.

Crafted by Teyssor, a recognized name in bike accessories, this rotor caters well to casual cyclists and serious riders alike. Its colorful finish not only provides aesthetic appeal but also resists corrosion and wear under different weather conditions.

Fitting seamlessly with most disc brake systems, this rotor ensures easy compatibility and quick replacement. Compared to heavier or simpler rotors, the Teyssor model offers improved heat dissipation, which reduces brake fade during long rides. Riders looking for a reliable, durable upgrade will find value here in both performance and build quality.

Pros

• Lightweight design at 122g promotes agility on the bike.
• Includes six screws for hassle-free installation.
• Durable colorful finish protects against corrosion and wear.

Cons

• May not suit some high-performance or downhill-specific braking setups.

Reliable braking combined with a durable, lightweight design makes the Teyssor 160mm rotor a practical choice. It stands out for smooth performance and easy fitting, delivering consistent stopping power for most riders’ cycling needs.

2. Teyssor 140mm 160mm 180mm 203mm Bike Disc Brake Rotor with

The Teyssor 160mm Bike Disc Brake Rotor offers reliable stopping power with excellent durability. Designed to meet the demands of mountain biking and trail riding, this rotor ensures smooth braking performance in diverse conditions.

Crafted with precision, it combines lightweight construction with robust materials to provide consistent control. Riders seeking dependable brake rotors will appreciate its balance of strength and efficiency.

Featuring a 160mm outside diameter and 9mm thickness, this brake rotor fits a wide range of bike setups. The center distance of 44mm allows for easy compatibility with most disc brake calipers.

The center distance of 44mm allows for easy compatibility with most disc brake calipers. Each package includes six attachment screws, making installation straightforward and complete.

Weighing just 122 grams, it adds minimal weight to your bike without compromising strength. The rotor’s colorful design stands out while offering corrosion resistance for lasting use. It maintains sharp braking power even under intense riding conditions or variable weather.

It maintains sharp braking power even under intense riding conditions or variable weather.

Designed by Teyssor, a trusted manufacturer in cycling components, this rotor consistently ranks highly in the bike brake category. Its smooth braking action and dependable heat dissipation enhance rider control and safety.

This rotor suits riders who demand durability and precise braking for trail, mountain, or casual cycling.

Pros

• Lightweight yet durable design at just 122g
• Comes with screws for complete installation package
• Reliable braking performance in various riding conditions

Cons

• Limited availability of size options within single purchase

The Teyssor 160mm Bike Disc Brake Rotor delivers steady braking power suitable for multiple biking styles. Its combination of lightweight construction and solid build makes it a practical upgrade or replacement for existing rotors. This rotor offers great value without sacrificing performance.

This rotor offers great value without sacrificing performance.

3. 2Pcs 160mm Disc Brake Rotor Stainless Steel Bike Disc Brake

Enhance your biking control with the 2Pcs 160mm Disc Brake Rotor set designed for reliable stopping power. Crafted for cyclists seeking consistent performance, these rotors balance durability and lightweight construction. Upgrade your bike’s braking system for safer rides on varied terrains.

Engineered from high-quality stainless steel, the rotors resist wear and high temperatures effectively. Their precise 160mm size fits most road, mountain, BMX, and MTB bikes, ensuring broad compatibility. The polished surfaces promote smooth braking and help prevent rust over time.

The polished surfaces promote smooth braking and help prevent rust over time.

The aerodynamic design features hollowed-out sections and large ventilation holes for efficient heat dissipation. This reduces the risk of brake fading during long rides, enhancing overall performance.

Each rotor measures 2mm in thickness and weighs 110 grams, offering a great balance of strength and lightness.

Installation is straightforward with the included six fixing bolts, making it user-friendly for riders who prefer quick upgrades. The sturdy build minimizes deformation, allowing for consistent braking force even under heavy usage. Suitable for riders who want a smooth, responsive braking experience without compromising on durability.

Suitable for riders who want a smooth, responsive braking experience without compromising on durability.

Pros

• Durable stainless steel construction resists wear and heat.
• Hollow design improves ventilation and reduces weight.
• Easy installation with included fixing bolts.

Cons

• May require periodic alignment to maintain optimal braking.

This brake rotor set offers a solid mix of strength, lightweight design, and ease of use. It delivers reliable stopping power suited for various biking styles without compromising on build quality.

4. Teyssor 140mm 160mm 180mm 203mm Bike Disc Brake Rotor with

Experience reliable stopping power with the Teyssor 160mm Bike Disc Brake Rotor. Designed to provide consistent braking performance, this rotor offers durability and precise control.

Perfectly suited for a range of cycling needs, this rotor ensures smooth braking in various conditions. Its lightweight design keeps your bike agile without compromising strength.

The Teyssor 160mm rotor comes with six mounting screws, making installation straightforward and secure. Featuring a

9mm thickness and a 44mm center distance, it balances robustness with efficient heat dissipation. Weighing just 122 grams, it helps maintain overall bike performance without adding unnecessary bulk.

Constructed from high-quality materials, the rotor withstands intense braking forces and resists warping over time. The colorful finish not only enhances appearance but also provides corrosion resistance, extending the rotor’s lifespan.

Ease of use is highlighted by the included screws and standardized design, allowing quick replacement or upgrades. Compared to other rotors in its class, the Teyssor delivers excellent value by combining performance and durability at a competitive level.

Pros

• Durable construction resists warping under heavy use
• Lightweight design maintains bike agility
• Includes six screws for easy installation

Cons

• Limited color options compared to other rotors

The Teyssor 160mm brake rotor offers a reliable and robust braking solution for cyclists who demand durability and consistent performance. Its thoughtful design and included hardware make it a practical upgrade for various biking styles.

5. Teyssor 140mm 160mm 180mm 203mm Bike Disc Brake Rotor with

Upgrade your bike braking system with the Teyssor 160mm Bike Disc Brake Rotor, designed to deliver reliable stopping power and durability. Crafted for a smooth and consistent performance, this rotor matches the demands of both casual riders and serious cyclists alike.

Combining precision engineering with lightweight construction, the rotor offers efficient heat dissipation and stable braking under varied conditions. It includes six screws for secure attachment, ensuring easy installation and a firm fit on your bike. With a thickness of

With a thickness of 9mm and a center distance of 44mm, it fits most standard disc brake setups without compromising strength or responsiveness.

Constructed by Teyssor, this rotor balances weight and durability at 122 grams for the 160mm size. The colorful design not only improves aesthetics but also adds corrosion resistance for long-lasting performance. Its compatibility with multiple rotor sizes (140mm, 160mm, 180mm, 203mm) offers flexible options based on your braking needs.

Its compatibility with multiple rotor sizes (140mm, 160mm, 180mm, 203mm) offers flexible options based on your braking needs.

The rotor maintains smooth rotation and reduced noise, thanks to its precise manufacturing standards. Ideal for mountain, road, and hybrid bikes, it enhances control and safety on various terrains.

Compared to other models in its category, the Teyssor rotor stands out for combining quality materials with competitive feedback from thousands of users. It’s especially suitable for riders seeking dependable brakes without increasing weight dramatically, thereby improving overall bike performance and ride confidence.

Pros

• Durable and lightweight design enhances braking efficiency
• Includes screws for straightforward installation
• Versatile size options suitable for different bike types

Cons

• May require careful alignment to avoid rotor rub on some bikes

The Teyssor 160mm Bike Disc Brake Rotor combines quality craftsmanship with user convenience, offering consistent and effective stopping power. Its balance of weight, durability, and ease of use makes it a smart choice for upgrading bike braking systems.

6. BlueStars 160mm Disc Brake Rotor Stainless Steel Bike Disc Brake

Experience consistent and reliable braking performance with the BlueStars 160mm Disc Brake Rotor. Crafted from stainless steel, it offers durability and excellent heat resistance needed for smooth bike rides.

This rotor balances strength and lightweight design, making it suitable for varied riding environments. Its dimensions and build quality assure compatibility and long-lasting use, enhancing overall bike control.

Installation is straightforward, allowing quick upgrades or replacements.

The BlueStars 160mm rotor measures 160mm in diameter, 44mm center distance, and 9mm thickness with a weight of 122g. These precise specifications ensure perfect fitment on compatible hubs for smooth operation.

It supports six mounting bolts, securing the rotor firmly in place during aggressive braking.

Constructed entirely from corrosion-resistant stainless steel, the rotor withstands harsh weather and road debris without deterioration. The precision-cut braking surfaces promote even pad contact, reducing vibrations and noise. Such design prevents warping and maintains braking consistency over time.

Performance-wise, it delivers stable stopping power suitable for various terrains and riding styles. Whether tackling city streets or light trails, the rotor enhances control and safety.

Ideal for cyclists needing a dependable, easy-to-install brake rotor, it fits replacements or upgrades with assurance. Compared to similar rotors, this model offers a balance between durability and weight, promoting efficient braking without adding excess mass. A solid choice for riders valuing performance and reliability.

A solid choice for riders valuing performance and reliability.

Pros

• Durable stainless steel construction resists corrosion and heat.
• Precision-cut braking surface reduces noise and vibration.
• Compatible with 6-bolt hubs, ensuring secure and stable fitment.

Cons

• Limited to 6-bolt hub systems; not suitable for center-lock setups.

The BlueStars 160mm Disc Brake Rotor offers durable, consistent braking performance with easy installation. Its carefully engineered design supports enhanced control and longevity, making it a reliable choice for everyday cyclists upgrading their brake system.

7. 160mm Disc Brake Rotor with 6 Bolts Stainless Steel Bicycle

Upgrade your bike’s braking system with the 160mm Disc Brake Rotor featuring a durable 6-bolt stainless steel design. This rotor delivers consistent stopping power and excellent heat management for smoother rides.

Designed for compatibility with Shimano Alivio and Deore disc brakes, it provides reliable performance on various terrains. Installation is straightforward, making it suitable for riders seeking improved braking response.

The rotor measures 160mm in diameter with a thickness of 9mm, offering a precise fit for disc brake-ready frames and forks. Its stainless steel (SUS410) construction guarantees resistance against corrosion and extended service life.

Its stainless steel (SUS410) construction guarantees resistance against corrosion and extended service life.

Heat dissipation is a strong point, preventing brake fade during intense cycling sessions. The 6-bolt pattern ensures secure mounting, enhancing durability and safety when braking.

Included in the package are two rotors and twelve screws, covering replacement needs in one purchase. This setup supports consistent braking performance, suitable for commuters, mountain bikers, and casual riders alike.

Compared to other options in this size, the sturdy build and thoughtful design of these rotors stand out. Their balance of toughness and lightweight materials helps in maintaining bike agility while improving control.

Installation requires basic tools and can be done quickly, even by those with moderate mechanical experience. Overall, these rotors offer excellent value by combining reliable braking with quality materials and easy setup.

Pros

• Strong stainless steel construction for long-lasting use
• Efficient heat dissipation to maintain brake performance
• Comes with all necessary mounting screws for convenience

Cons

• May produce slight noise during initial use until properly bedded in

This 160mm disc brake rotor combines quality material with proven design for dependable braking. Its versatility and easy installation make it a practical choice for upgrading or replacing your bike’s rotors, enhancing safety and ride control.

8. SRAM Paceline CenterLock Brake Rotor 160mm Rounded | bike-brake-rotors

Upgrade your bike’s braking system with the SRAM Paceline CenterLock Brake Rotor 160mm Rounded. Engineered specifically for road cycling, this rotor combines durability and quiet operation for smooth rides.

Its sleek design ensures consistent brake performance while maintaining lightweight efficiency.

The internal tooled lockring provides secure attachment, reducing maintenance hassles. At 60 mm thickness, the rotor balances heat dissipation and longevity.

60 mm thickness, the rotor balances heat dissipation and longevity. The Paceline brake track is optimized to minimize noise, delivering a calm and responsive braking feel on every ride.

Designed by SRAM, a trusted brand in cycling components, this brake rotor is perfect for road bike riders seeking reliable stopping power. The construction uses high-quality materials, enhancing both strength and wear resistance.

Its 160mm size suits a variety of road bikes without sacrificing performance.

Installation is straightforward thanks to the included locking ring and CenterLock system. The rotor’s light weight of just

Users report excellent compatibility with many disc brake setups, making it a versatile choice.

Compared with other brake rotors, the SRAM Paceline offers quieter braking due to its special track design. This enhances overall riding comfort, especially on longer journeys.

Pros

• Quiet brake operation thanks to Paceline brake track
• Secure fit with internal tooled lockring and CenterLock mount
• Durable 1.60 mm thickness designed for road cycling

Cons

• Limited color options available

The SRAM Paceline CenterLock Brake Rotor 160mm Rounded is a strong candidate for riders desiring reliable, quiet braking. It fits well with many road bike setups and offers features that enhance durability and rider comfort.

9. TEKTRO TR180-52 Bicycle Disc Brake Rotor For Maximum Control |

Experience enhanced braking performance with the TEKTRO TR180-52 Bicycle Disc Brake Rotor. Designed to offer maximum control and reliable stopping power, this rotor is ideal for riders seeking precision and durability.

Built with a 8mm thickness, the rotor provides optimal heat dissipation and resists warping during intense rides. Compatible with 6-bolt mounting systems, installation is straightforward and secure.

Compatible with 6-bolt mounting systems, installation is straightforward and secure. Whether you’re cruising through urban streets or tackling rugged trails, the TR180-52 delivers consistent braking power for a safer ride.

TEKTRO’s disc brake rotor boasts a sturdy build that balances strength and lightweight design. Crafted from high-quality materials, it withstands frequent use and harsh conditions without compromising performance.

Performance-wise, it provides a smooth and precise braking experience. Its 160mm diameter offers ample surface area for efficient heat dispersion, reducing brake fade during prolonged use. Installation is user-friendly thanks to the standard 6-bolt setup, making replacement or upgrades hassle-free for most bicycles.

Installation is user-friendly thanks to the standard 6-bolt setup, making replacement or upgrades hassle-free for most bicycles.

The rotor’s value lies in its combination of durability, reliable control, and ease of use. Suitable for casual riders and daily commuters, it enhances safety without requiring constant adjustment. While it stands strong among similar rotors, its consistent customer ratings highlight satisfaction in both form and function.

While it stands strong among similar rotors, its consistent customer ratings highlight satisfaction in both form and function.

Pros

• Durable construction with 1.8mm thickness for longevity
• Efficient heat dissipation reducing brake fade
• Easy installation via standard 6-bolt mounting system

Cons

• Limited to 2-piston brake caliper compatibility

Offering dependable braking and sturdy build quality, the TEKTRO TR180-52 rotor is a solid choice. It balances performance and ease of installation, making it a practical upgrade for many bicycle setups.

10. 160mm Bicycle Brake Rotor, Stainless Steel Threaded Hubs Brake Disc

Experience reliable stopping power with the 160mm Bicycle Brake Rotor designed for a variety of bike types. Crafted to deliver stable and consistent braking, this rotor perfectly balances durability and performance for any ride.

Its versatile compatibility spans mountain bikes, road bicycles, and BMX models, making it a practical upgrade or replacement. The 160mm diameter and precise hole spacing ensure a secure fit on suitable hubs, enhancing braking response.

Constructed from premium stainless steel, this brake rotor resists deformation, corrosion, and wear to maintain peak performance over time. Its thoughtful design includes curved, fanned, and hollow patterns along with cross-drilled cooling holes, which effectively dissipate heat during intense use.

The rotor’s ventilation features help avoid brake fade and improve sensitivity, contributing to safer stops across varying conditions. Installation is straightforward as it fits threaded hubs using the included flange adapter, eliminating the need for extra tools or complex adjustments.

Its strong build quality ensures stable braking power, even in challenging weather and terrain. Ideal for riders seeking a dependable, easy-to-fit brake disc that withstands regular use without compromising performance or reliability.

Pros

• Durable stainless steel resists wear and corrosion effectively
• Innovative design enhances cooling for consistent braking performance
• Simple installation with included flange adapter for threaded hubs

Cons

• Compatibility limited to bikes with threaded hubs only

This brake rotor presents a solid choice for riders needing long-lasting and efficient disc brakes. Its reliable construction and advanced ventilation design make it stand out in its category without requiring complicated setup.

Top 160mm Brake Rotors: Ultimate Buying Guide 2024

Performance and durability factors

The best 160mm brake rotor plays a significant role in maintaining smooth and reliable stopping power for bicycles. When exploring options, focusing on how well the rotor dissipates heat can greatly impact performance, as rotors designed with effective cooling features help prevent brake fade during prolonged or intense rides. Materials and surface treatments also contribute to wear resistance, extending the rotor’s lifespan even under challenging conditions.

Additionally, paying attention to noise and vibration characteristics can improve overall riding comfort; rotors engineered to minimize squealing and vibration enhance the cycling experience by providing quieter and more stable braking. Considering these aspects will help select a brake rotor that balances durability with consistent performance for various riding styles and environments.

Weight and design considerations

Choosing the best 160mm brake rotor involves understanding how weight and design impact your bike’s performance and handling. Lightweight rotors tend to be favored in racing scenarios where reducing overall bike weight can enhance speed and maneuverability, allowing for quicker acceleration and more responsive control. On the other hand, heavier rotors are often preferred for their durability and heat dissipation in demanding or extended rides, such as aggressive trail riding or downhill courses.

On the other hand, heavier rotors are often preferred for their durability and heat dissipation in demanding or extended rides, such as aggressive trail riding or downhill courses. Different design features like slotting and drilling play a role in improving braking efficiency by helping to dissipate heat and channel away water or debris, which can lead to more consistent stopping power. It is helpful to balance these factors based on your typical riding style—those prioritizing agility might lean toward simpler, lighter rotors, while riders focused on strength and longevity might select robust designs with additional slots or drilled holes.

Ultimately, the right rotor impacts your bike’s weight and handling characteristics, so choosing one that aligns with your riding needs will enhance safety and overall ride quality.

Compatibility with your bike and brakes

When selecting a 160mm brake rotor, ensuring that it matches your brake caliper setup is necessary for smooth function and safety. Different calipers require rotors with specific thicknesses and designs to avoid uneven wear or poor stopping power. Attention to how the rotor mounts to your wheel hub can make a significant difference.

Two common mounting standards include the 6-bolt pattern, which uses six bolts to attach the rotor securely, and centerlock, which employs a splined lockring system allowing for quicker installation and removal. It is equally important to verify that your wheel and hub accommodate the rotor size and mounting style you choose, as some hubs may only support one standard or rotor diameter.

Proper fitment guarantees that the rotor sits correctly within the braking system, preventing rubbing or clearance issues during rides. Taking these factors into account helps you pick a rotor that integrates seamlessly with your existing components and enhances braking performance on varied terrains.

Understanding 160mm brake rotors

When choosing a 160mm brake rotor, it helps to think about how the size fits your bike’s braking system since compatibility is key to smooth performance and safety. Rotors in this size come mainly in two types: solid and vented.

Solid rotors are straightforward and durable, often preferred for commuting or casual riding, while vented rotors have grooves or holes that help dissipate heat more effectively, which is useful for longer descents or more intense braking. The material of the rotor influences its weight, durability, and heat management. Steel is commonly used because it is strong and reliable, providing consistent stopping power.

Aluminum variants tend to be lighter and sometimes paired with steel braking surfaces, resulting in better heat dispersion and reduced weight. Composite materials might offer a balance between weight and strength but can vary in price and availability.

Riders should consider how they plan to use the brakes—whether for casual riding, mountain biking, or more aggressive downhill riding—to choose a rotor that balances heat resistance, durability, and weight according to the demands of their style and terrain.

Price and brand reputation

When choosing the best 160mm brake rotor, keeping in mind the balance between budget and premium rotor options can make a big difference in performance and longevity. Affordable rotors often provide reliable stopping power suitable for casual riding and lighter use, while premium rotors tend to offer enhanced durability, better heat dissipation, and improved resistance to warping under heavy braking conditions.

Trusted brands frequently have a history of producing high-quality components and a solid reputation supported by positive user reviews, which can give confidence in the rotor’s durability and overall value. Paying attention to feedback from other riders can reveal insights about real-world performance and any potential issues, making it easier to choose a rotor that matches your riding style and needs.

Combining thoughtful research on rotor features with brand reliability and after-sales service will help in picking the best 160mm brake rotor suited for your bike.

Installation and maintenance tips

When putting in a 160mm brake rotor, following the proper installation procedures helps maintain braking performance and safety. Start by cleaning the rotor surface to remove any manufacturing oils before attaching it firmly to the hub using the correct torque settings on the bolts.

Ensuring the rotor sits evenly prevents wobbling and uneven wear. Regular maintenance plays a big role in extending the life of the rotor. This includes checking for dirt and debris that can accumulate between the rotor and brake pads as well as inspecting for signs of warping or glazing on the rotor surface.

Rotors tend to wear down over time due to heat and friction, so keeping an eye out for thinning metal or noticeable performance changes will indicate when replacement is necessary. Typically, replace the 160mm brake rotor if there are deep grooves, cracks, or if braking efficiency diminishes despite pad replacement. Taking these steps provides smoother rides and consistently reliable stopping power.

People Also Asked

Which Materials Are Best For 160Mm Brake Rotors In Terms Of Durability And Performance?

For 160mm brake rotors, high-quality stainless steel is best for durability and consistent performance due to its corrosion resistance and thermal stability. Additionally, rotors with a ceramic or carbon-infused coating can enhance heat dissipation and reduce wear for improved braking efficiency.

What Are The Benefits Of Using A 160Mm Brake Rotor On A Bike?

A 160mm brake rotor provides a good balance of effective stopping power and lightweight performance, making it ideal for cross-country and trail riding. It offers reliable heat dissipation while adding minimal weight, enhancing overall bike handling and control.

How Do Different Brands Compare When It Comes To 160Mm Brake Rotors?

Different brands of 160mm brake rotors vary in terms of material quality, heat dissipation, and durability, with premium brands often offering better performance and longer lifespan. Additionally, some brands provide specialized designs for improved cooling and weight reduction, catering to various riding styles and conditions.

What Factors Should I Consider When Choosing A 160Mm Brake Rotor For Mountain Biking?

When choosing a 160mm brake rotor for mountain biking, consider compatibility with your bike’s brake system and caliper size, rotor material for durability and heat dissipation, and the type of terrain you’ll be riding to ensure adequate stopping power. Additionally, check the rotor’s weight and design for optimal performance and weight savings.

How Do 160Mm Brake Rotors Affect Braking Performance On Road Versus Off-Road Bikes?

160mm brake rotors provide adequate stopping power for road bikes by offering a balance between weight and heat dissipation, ensuring smooth braking in typical conditions. However, for off-road bikes, they may deliver less braking force and heat management compared to larger rotors, which are preferred for handling rough terrain and extended descents.

Conclusion

Choosing the best 160mm brake rotor involves balancing durability, heat dissipation, and braking performance. While some models offer excellent stopping power and long-lasting materials, others may be heavier or pricier, which could matter depending on your specific needs.

Those concerned about compatibility should verify fit with their braking system before purchase. Overall, the best 160mm brake rotor delivers consistent performance and dependable braking without unnecessary bulk, making it a solid choice for many everyday riders seeking effective stopping control without overinvesting in larger, heavier components.