FORM MTB Leg Length Shim – Walkable V2

(14 customer reviews)


Brand: Form Bike Fitting

Form MTB Walkable Leg Length Shims help cyclists compensate for leg length discrepancies. They reduce pain and allow cyclists with leg length discrepancies to ride uninhibited.

In stock

SKU: 230712 Categories: , Tags: , ,
GTIN: 731716552728


FORM’s patented MTB Leg Length shims are the only “walkable” MTB shim on the market and were developed specifically to overcome the issues inherent in traditional MTB shim designs.  These shims are ideal for gravel, cyclocross or cross-country MTB riding where a relatively high amount of time is spent in seated pedaling, and are best suited to traditional MTB, gravel, or touring shoes utilizing an MTB or SPD style (2-hole) cleat.


Inherent issues in Traditional MTB or SPD Leg Length Shim Designs:

  • Difficulty when walking or clipping in
  • A wobbly and unstable connection to the pedals

Walkable MTB Leg Length Shim V2 Problem Solving Features

  • 2 parallel tread areas to protect the cleat and add clipped-in stability
  • Chamfered front feet which facilitate easy cleat engagement
  • Two sets of posts/tabs which protrude into the shoe to resist rotation

FORM MTB Leg Length Shim Usage Criteria

Leg length shims are used to increase the effective leg length of a shorter leg in cases where a cyclist suffers from a leg length discrepancy. Signs of a discrepancy can be:

  • Overreaching on one side at the bottom of the pedal stroke
  • Pelvis tilted or rider leaning to one side of the saddle to retain connection with the pedals (many times this is apparent in saddle wear on one side more than the other)
  • One leg feeling under-extended whilst the other feels just right

Assuming a rider has been assessed to have a discrepancy, the issues above could be solved with the use of leg length shims.


  • Create a more equal leg extension
  • Stabilize the pelvis
  • A smoother and more controlled pedal stroke
  • Increase efficiency
  • Reduce Pain

What’s in the Box?

A single shim for one shoe, comprised of:

  • 3mm main body
  • Cleat Plate
  • 1mm spacer
  • 2mm stacker
  • Longer screws, with Torx head.
    • requires Torx T25 driver to install

What’s different from the single kit bulk option for fitters?  Only the packaging.  This one features a hang tag for pegging on a wall.  Contents are the same.

Cleat Shim Stack Height Options

The base height is 3mm which can be increased to 6mm with the addition of a 1mm spacer and 2mm stacker:

  • 3mm (main body only)
  • 4mm (main body 1mm spacer)
  • 5mm (main body 2mm stacker)
  • 6mm (main body 1mm spacer & 2mm stacker)

V2 MTB Shim Compatibility

  • All MTB cleats including:
    • Shimano SPD
    • Time ATAC
    • Crank Bros.
    • Look X-Track

Additional information

Weight0.15 lbs
Dimensions6 × 2 × 1 in

14 reviews for FORM MTB Leg Length Shim – Walkable V2

Customer Images

Image #1 from dominic cordima
Image #1 from dominic cordima

dominic cordima

This is the best shim kit for two bolt style pedals on the market. If you're experiencing a leg length discrepancy you know that the pontoons on the sides of the cleat are not in contact with the pedal surface. This fixes that problem 100%. After five rides I am feeling power and some soreness from the quads and hamstrings like I haven't before. Before all my power was from the calf muscles. I am now able to ride longer and generate more power. I attribute that to this product. I own three sets for the three different pairs (gravel, MTB and wet/winter) of shoes. When I buy a new pair of shoes this is a must own product.

(1) (0)
Image #1 from dominic cordima
4.5 Rating
1-5 of 14 reviews
  1. Verified reviewVerified review - view originalExternal link

    These have solved the problem of fitting a walkable shim to SPD shoes. The shim worked great with my Dromarti shoes. Easy to install and when walking, I don’t know they’re there. Great product!

    (0) (0)
  2. Verified reviewVerified review - view originalExternal link

    Could not clip in.

    (0) (0)
  3. Verified reviewVerified review - view originalExternal link

    My fitter recommended this shim to compensate for a leg length discrepancy. Once on the shoe, it’s still easy to clip in and out, and still reasonably easy to walk around. More importantly, my longer leg can now extend farther, which translates into more power. Wish I had discovered these years ago!

    (1) (0)
  4. Verified reviewVerified review - view originalExternal link

    Great product. Finally feeling a pedal stroke that feels well balanced and competitive now that I’ve used the SPD cleat shim for my LLD issue. Back on the bike and even better no saddle sores. Have used a few other solutions but this is top notch. Absolutely best so far. 2 thumbs up!

    (0) (0)
  5. Verified reviewVerified review - view originalExternal link

    (0) (0)
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Yes. They are compatible with almost all mountain bike cleats including but not limited to

  • Shimano SPD
  • Time ATAC
  • Crank Bros.
  • Look X-Track

Q.  I had to tighten the cleat bolts considerably before they would stop slipping. The hard plastic piece that comes in contact with spd cleat was then bent.

A. There are 3 long fins on the cleat plate which match 3 slots in the main body. The fins should fit snugly into the slots. If they don’t the entire cleat plate with remain in an elevated position. Tightening the cleat down will then cause the plate to bend. When fitted correctly, the 3 fins go through the main body and contact the sole of the shoe. This prevents the plate from bending/warping.

Incorrectly seated cleat plateIncorrectly seated cleat plate

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