GRX BL-RX812 Sub Brake Lever
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GRX BL-RX812 Sub Brake Lever
For the unexpected obstacles of gravel riding, Shimano’s GRX BL-RX812 Sub Brake Lever has your back. Designed as an auxiliary brake lever, it’s mounted on the upper tops and is connected to your bike’s hydraulic brake system. With this option, you’ll get fast braking in an upright position that is safe and more easily accessible from multiple positions.
This in-line brake lever brings greater control to the rider on mixed terrain with category-leading stopping power. The hydraulic disc sub brake offers quick access riding upright on the tops of the handlebars so nothing catches you off-guard. Thanks to the easy accessibility of this lever, you’ll see less fatigue on long tours and a greater range of motion on your ride.
Details
- Accessible lever for in-line braking on gravel tours
- Hydraulic brake lever for drop bars
- Fast braking in an upright position and less fatigue on long rides
- Front mount with reach adjustment for easy maintenance
- Item #SHIU197
- Type
- disc
- Adjustability
- reach
- Includes
- 2 olives and barbs, 1 brake hose section
- Claimed Weight
- 2.9oz (82g)
Reviews
Q&A
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Overall Rating
5 based on 2 ratings
Review Summary
Fits True To Size
Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.View
Selecting an option will reload the available reviews on the pageOctober 29, 2025
Every gravel bike should have these
- Familiarity:
- I've put it through the wringer
On long rides it's all about hand position and being able to make changes while maintaining control. These sub brakes allow you to place your hands several inches from the stem and yet maintain braking control. They work perfectly with the original brakes, and do not cause any loss of function or feel in the primary levers. While not as strong as the primary lever, they are much stronger than you might think. However, will not work on flat bars, that I can tell.
Originally reviewed on Competitivecyclist.com
October 3, 2024
Better braking!!
- Familiarity:
- I've used it several times
these are a game changer! no need to break in the drops on downhills means much more control on descents and less likelihood of endos.
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