BikeFit Leg Length Shims

If you experience persistent knee or hip pain on one side, or if a professional bike fitter has identified a functional or structural leg length discrepancy, these shims can help. They are designed to level your pelvis and improve biomechanical alignment, which often resolves uneven strain during your pedal stroke.

Yes, you can stack these shims, but you will need to ensure your cleat bolts are long enough to accommodate the extra thickness. If you are stacking more than two shims, it is highly recommended to consult with a professional bike fitter to ensure your cleat engagement remains safe and secure.

These shims are designed for standard three-hole road cleat systems, including Look, Time, and Shimano SPD-SL. They fit directly between your shoe and the cleat, matching the curvature of most road cycling soles for a stable interface.

In most cases, a single 3mm shim will work with your existing cleat bolts. However, if you are stacking multiple shims, you will likely need longer bolts to maintain a secure connection between the cleat and the shoe.

While the shim adds 3mm of height, it does not change the engagement mechanism of your pedal system. You may need to slightly adjust your saddle height to compensate for the added stack height on one side, ensuring your leg extension remains consistent.