Brake Adapter (20mm IS)
Best solution for cyclists upgrading to larger disc brake rotors.
Upgrade your bike's stopping power with the SRAM 20mm IS Disc Brake Adaptor. This adapter provides excellent flexibility, letting you easily fit your preferred rotor size for tailored braking performance. It includes all necessary mounting hardware for a simple and secure setup. Designed to support key configurations, this +20mm adapter is perfect for adapting a 140mm post mount to a 160mm rotor, a 160mm post to an 180mm rotor, or a 180mm post to a 200mm rotor, ensuring precise adjustments for optimal stopping power.
$23.00
Owner Satisfaction
4.5
/ 5
Category Rank
671
/ 2100
#671 in Components
Price vs Category Average
-78%
Below average
Adapter Type
IS Post Mount
/ IS Post Mount
Who it's for
- Vintage bike owners upgrading to modern braking systems
- Aggressive riders seeking better heat dissipation and stopping power
- Mechanics prioritizing reliable, high-quality component integration
Who should skip it
- Weight-conscious cyclists avoiding extra hardware and setup complexity
- Modern bike owners with native Post Mount frames
- Home mechanics wary of complex caliper alignment procedures
Performance breakdown
Compatibility Range
Seamlessly bridges the gap between various post mounts and rotor sizes.
Installation Simplicity
Includes all necessary hardware for a quick and straightforward setup.
Structural Integrity
Robust construction ensures reliable performance under heavy braking loads.
Weight Efficiency
Minimalist design adds essential functionality without unnecessary bulk.
Alignment Precision
Engineered for exact spacing to prevent rotor rub and noise.
Upgrade Versatility
Provides the flexibility needed to dial in your preferred stopping power.
Key Specs
Adapter Type
IS Post Mount
Rotor Size Increase
+20mm
Supported Configuration 1
140mm post to 160mm rotor
Supported Configuration 2
160mm post to 180mm rotor
Supported Configuration 3
180mm post to 200mm rotor
SKU
00.5318.009.001
Features
- Allows rotor size flexibility
- Includes mounting hardware
- Enables +20mm disc brake adaptation
- Supports multiple post/rotor combinations
- Designed for smooth installation
- Offers versatility in rotor size
What customers say
Customers overwhelmingly praise the SRAM Brake Adapter for its perfect fit and seamless integration, making it essential for 20mm rotor upgrades on IS mounts. The core theme is reliability and ease of use; installation is consistently described as straightforward and hassle free. Reviewers value the adapter's robust construction, which upholds SRAM's reputation for quality. It functions exactly as intended, providing necessary spacing and alignment without complication. While some note the price for a simple component, its vital functionality and the performance boost it enables make it a highly recommended, dependable solution for brake system enhancements.
Know before you buy
This adapter increases the distance between your brake caliper and the mounting point on your frame or fork. It allows you to run a rotor that is 20mm larger than what your frame or fork was originally designed to accommodate.
It is designed for three specific setups: moving from a 140mm post to a 160mm rotor, a 160mm post to an 180mm rotor, or a 180mm post to a 200mm rotor.
Yes, the package includes all the necessary mounting hardware required to secure the adapter to your frame or fork and the caliper to the adapter.
While designed by SRAM, this adapter follows standard post-mount spacing conventions. It should work with most major brake brands, provided your frame and fork use the standard post-mount interface.
No, this adapter is specifically engineered for a +20mm increase. To jump from a 160mm mount to a 200mm rotor, you would need a +40mm adapter instead.
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