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Brand: Form

Form MTB Leg-Length Cleat Shim Kit

Form MTB Leg-Length Cleat Shim Kit

Regular price £20.00 GBP
Regular price £21.00 GBP Sale price £20.00 GBP
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Leg Length Shims, such as the Form MTB Shim, can serve the purpose of correcting asymmetries and reducing excessive load. This can solve saddle pain, improve pedalling efficiency, and improve performance.

These sit under the cleat, between the outer sole of the shoe. It’s important to have these recommended to you by your Physiotherapist & Bike Fitter, as if applied incorrectly, can further exacerbate asymmetries, load and cause injury.


Used to compensate for leg length discrepancies, these are often clinically indicated for those with (one leg, shorter than the other). Signs of this include overreaching on one side at the bottom of the pedal stroke or increased saddle pressure to one side. A Leg Length discrepancy is most accurately diagnosed with an X-ray, however a Specialist Physiotherapist will be expert in utilising a combination of saddle pressure mapping and physiotherapy assessment to determine the need during a fit.

We as bike fitters use the Form Universal 3-hole, as its discrete and curved to match the shape of the sole of a cycling shoe. A chamfered front makes it easier to clip in, when compared to other shims.


Manufacturer information

FORM’s patent pending MTB shims are the only “walkable” MTB shim on the market, and were developed specifically to overcome the issues inherent in traditional MTB shim designs, those being;

- a difficulty when walking or clipping in

- a wobbly and unstable connection to the pedals

These shims are ideal for gravel, cyclocross or cross country MTB riding where a relatively high amount of time is spent in seated pedalling, and are best suited to traditional MTB, gravel, or touring shoes utilising an MTB style (2-hole) cleat.

Assuming a rider has been assessed to have a discrepancy, the issues above could be solved with the use of leg length shims. Shimming will create a more equal leg extension, stabilise the pelvis and lead to a smoother and more controlled pedal stroke.

* The V2 shim is compatible with all MTB style cleats, including SPD, Time ATAC, Crank Bros and Look X-Track.

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