If you are a right above-knee amputee and need to adapt your rear brake for hand operation, you’ve likely considered using a thumb-operated brake. However, many riders find that the twin-lever system is a more efficient and flexible alternative.
A common issue with thumb brakes is limited clearance between the left switch cluster and the fuel tank, especially on bikes with compact handlebar layouts. You might be considering options such as choosing another bike, fitting different handlebars, or adding a steering stop limiter to create space — but before going that route, it’s worth exploring other brake control systems.
In practice, twin-lever units (such as the K-Lever2 or PFM twin-lever systems) are generally more efficient, easier to use, and more popular among adaptive riders. These units can be installed on short or long handlebars, on either side, and can be configured for hydraulic or cable systems. They also typically eliminate clearance problems, since they don’t protrude toward the fuel tank like many thumb brakes do.
If you still prefer a thumb-operated brake, make sure that the model you choose is capable of operating the brake system to MOT standard. Some units are designed mainly for track use and may not meet the requirements for road legality.
Finally, if you need financial assistance with the cost of adaptations, the NABD Adaptation Grant system may be able to help.
