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HY/RD Flat Mount Disc Brake Caliper

5 out of 5 stars
1 Review

Style & Size:


Adapt to the times.

Times were that a new standard in cycling tech warranted an entirely new bike. That's still the case with some things (axle types, we're looking at you), but TRP's HY/RD Flat Mount Disc Brake Caliper bumps a standard set of cable brake levers up to hydraulic disc functionality. The caliper is compatible with most current generations of cable-actuated Shimano and SRAM shift/brake levers, so chances are good that it already works with your current drivetrain.

The calipers relocate the hydraulic reservoir from the levers to the brake itself, reducing cockpit clutter and keeping the hoods nice and sleek. The HY/RD features automatic pad wear adjustment so braking is always consistent and it uses pads that are compatible with Shimano M525/M515 brakes, so replacements are always easy to find.

The HY/RD comes with semi-metallic pads that work well in dry conditions but may wear quickly in wet/muddy conditions. If you plan on CX riding an upgrade to full metallic is recommended, but they will be slightly louder. You can chose 160mm or 140mm rotors, though TRP recommends always running 160 up front.


  • Disc brake calipers that keep cable levers relevant
  • Flat-mount design better suited to road, 'cross, and gravel
  • Compatible with all existing cable-actuated systems
  • Hydraulic mechanism located at the caliper
  • Automatic pad wear adjustment
  • Uses pads compatible with Shimano M525/M515 brakes
  • Item #TRP000H
cable-actuated hydraulic disc
Mount Type
Rotor Size
140mm, 160mm
Claimed Weight
[single] 7.2oz (205g)
Recommended Use
cycling, cyclocross, gravel
Manufacturer Warranty
2 years

Overall Rating

5 based on 1 ratings

Review Summary

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5 Stars - 1 reviews

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5 out of 5 stars

December 27, 2022

These brakes are the truth

I've put it through the wringer

I have been using Hy/Rd since I bought a 2013 cross bike with mechanical disc brakes. A few races later, I knew I wanted better. So I bought a set of Hy/Rd (that set was post-mount, not direct mount). They are maybe 80% of the way there to hydraulic all the way through, and anyway better than any bleed I can accomplish on my own with a whole-hydraulic setup. You may need that extra 20%. I descend confidently in and around Seattle on mine (two different sets on two different bikes). This set is my third or fourth pair of them. Given the chance to build a road bike from scratch, I chose mechanical brake lines over these. And I am still happy. Because happiness is the truth.

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