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FORM SRX Leg Length Shim for RX910
FORM’s SRX leg length shim kit has been designed to match the unique configuration of Shimano’s groundbreaking SPhyre RX910 gravel racing shoe. Based on a lightweight road shoe, the RX910 includes a separate walkable pontoon, making it lightweight, stiff, and walkable. FORM’s SRX shim system matches this uniquely designed platform which is aimed at fast gravel racing.
Available in kits for 3-6mm and 7-10mm of stack height.
Please note: this shim is compatible ONLY with the Shimano S-Phyre RX910 shoe. No other gravel or MTB shoes will work with this product.
$34.00
FORM Leg Length Shims are designed specifically for cyclists who have a true or functional leg length discrepancy and need to increase the effective length of one leg. These shims install between the shoe and cleat to help restore symmetry, reduce discomfort, and improve pedaling control when one leg consistently feels shorter or under extended.
Leg length shims are not general comfort accessories. They are a corrective tool used when a rider has been assessed to have a measurable difference in leg extension, either structural or functional. When used appropriately, they can dramatically improve balance, stability, and efficiency on the bike.
Benefits of FORM Universal Leg Length Shims
- Creates a more equal leg extension between left and right sides
- Helps stabilize the pelvis during the pedal stroke
- Produces a smoother and more controlled pedal stroke on the shorter side
- Reduces pain, discomfort, and asymmetrical loading
- Supports long term comfort and consistency across rides
Key Features
- Modular and stackable design using 1 mm and 2 mm shims, with a 3mm shim in the low height kit and a 7mm shim in the higher height kit
- Curved shape for easier fitment to the shoe sole
- Chamfered front edge to improve clip in engagement, especially when stacking shims
- Cleat position markers to help maintain accurate cleat alignment
- Constructed from tough, impact resistant nylon to withstand repeated clip-ins
- Designed to resist scuffing and hard impacts
Compatibility
- Shimano S-Phyre RX910 shoe only
What's in the Box?
- 1 x 1mm shim
- 1 x 2mm shim
- 1 x 3 OR 7mm shim (depending on kit height selection)
- Longer screws (2 each of 2 different lengths)
FORM SRX Leg Length Shim for RX910
FAQs
A cleat wedge cants the entire foot whereas a cleat shim such as a leg length shim increases the effective leg length of a shorter leg in cases where a cyclist suffers from a leg length discrepancy.
Yes, the 3-hole shims and 3-hole wedges are compatible and can be pinned together to create a “stack.” Always remember to place the wedges closest to the cleats, and shim closest to the shoe.
Yes, they are. There are quite a few different shaped cleats on the market but the shims will work with all 3-hole systems even if the shape is slightly different.
2mm and 3mm which can combine to add up to any desired thickness in 1mm increments.
You can stack 3 in the staggered configuration, and multiples in the vertical configuration limited only by the length of the pin. An alternative is 3 staggered and any above that in the vertical position. Please see the image below:
Shipping. In stock items ship within 3 to 5 days of your order. You get a tracking email when your order ships. Shipping is calculated at checkout by box size and weight.
Returns. Free 30 day returns for US customers: 30 days from purchase on unused, undamaged items with proof of purchase. We provide the return shipping label on request and approval of your return; packaging is your responsibility. Outside the US, shipping costs both ways are your responsibility. Sale items are non-returnable.
Wedges
Cleat Shims
Cleat Fitting Tools and Kits
Cycling Insoles
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