Shimano
Rear P/D Disc Brake Adaptor (140)
Best choice for cyclists upgrading to 140mm rear disc rotors.
Enhance your bicycle's braking performance with the Shimano Rear P/D Disc Brake Adaptor, engineered for 140mm rotors. This genuine Shimano component ensures precise alignment for your rear brake caliper, delivering reliable and safe stopping power. It's an essential part for an effective disc brake setup, boosting your confidence and control on every ride. Optimize your rear disc brake system with this crucial upgrade for superior performance and a smoother cycling experience.
$21.45
Owner Satisfaction
4.7
/ 5
Category Rank
68
/ 2100
#68 in Components
Price vs Category Average
-79%
Below average
Model Number
140
/ ISMMARPDH
Who it's for
- Cyclists mixing and matching different brake and frame standards
- Riders seeking perfect alignment and silent braking performance
- Mechanics prioritizing long-term structural reliability and safety
Who should skip it
- Minimalists wanting to reduce hardware and potential maintenance points
- Weight-conscious racers chasing every gram of bike savings
- Cyclists planning future upgrades to larger rotor sizes
Performance breakdown
Alignment Precision
Engineered tolerances ensure the caliper sits perfectly over the rotor.
Build Integrity
Robust construction withstands high-torque braking forces without flexing.
Installation Simplicity
Straightforward mounting process makes upgrading your brake system hassle-free.
Component Compatibility
Seamless integration with Shimano ecosystems guarantees reliable, consistent performance.
Weight Efficiency
Minimalist design keeps your rear end light without sacrificing structural strength.
Stopping Reliability
Provides the stable foundation necessary for confident, predictable braking power.
Key Specs
Model Number
ISMMAR140PDH
Rotor Size Compatibility
140mm
Component Type
Rear Disc Brake Adaptor
Brand
Shimano
Features
- Ensures proper rear brake caliper alignment
- Designed for 140mm rotors
- Facilitates reliable disc brake function
- Genuine Shimano quality
- Crucial for disc brake mounting
- Enhances stopping power
- Improves ride control
- Optimizes brake setup
What customers say
Customers overwhelmingly praise this Shimano adaptor for its exceptional quality and flawless functionality. Reviewers consistently highlight the impeccable fit, noting it integrates seamlessly into brake systems without misalignment or rub, unlike lesser alternatives. Installation is simple, often described as a set and forget component that works perfectly immediately. The robust construction assures long term reliability, which is crucial for safety related parts. While the initial cost is noted, the consensus confirms excellent value due to the superior, consistent braking performance and peace of mind it delivers. This dependable component upholds Shimano's commitment to excellence, significantly enhancing the overall riding experience.
Know before you buy
This adapter is specifically designed for post-mount (P/D) calipers. It is intended for use with 140mm rotors, so ensure your specific caliper model is compatible with that rotor size before installation.
No, this adapter is engineered exclusively for 140mm rotors. Using it with a larger rotor will result in improper caliper alignment and will prevent the brake pads from contacting the braking surface correctly.
Yes, this is a genuine Shimano component and typically includes the required bolts to secure the adapter to your frame and the caliper to the adapter.
No, this is specifically a rear disc brake adapter. Front and rear adapters have different geometries to account for the mounting standards on the fork versus the frame.
You do not need to bleed your brakes simply to install the adapter, provided you do not disconnect the hydraulic lines. However, you will need to re-center your caliper over the rotor once the adapter is installed to prevent rubbing.
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