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FORM MTB Leg Length Shim – Walkable V2
$39.50
In stock
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.
Why Standard MTB Leg Length Shims Cause Problems
- Difficulty when walking or clipping in
- A wobbly and unstable connection to the pedals
Key Features of the Walkable V2 Shim
- 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
When and Why to Use a Mountain Bike Leg Length Shim
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.
Curious how cleat adjustments and shim placement can work together? Check out our guide on cycling cleat positioning and adjustments for more context.
Neill Says...
Benefits of Using the FORM MTB Leg Length Shim
- Create a more equal leg extension
- Stabilize the pelvis
- A smoother and more controlled pedal stroke
- Increase efficiency
- Reduce Pain
What's Included in the V2 Shim Kit?
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 to the bulk option for fitters? Only the packaging and quantity.
Stack Height Options for the V2 Shim
The base height is 3mm, which can be increased to 6mm with the addition of a 1mm spacer and 2mm stacker. For a shim height greater than 6mm and up to 14mm, purchase the optional Extra Height Stacker kit in addition to this V2 shim.
- 3mm (main body only)
- 4mm (main body 1mm spacer)
- 5mm (main body 2mm stacker)
- 6mm (main body 1mm spacer & 2mm stacker)
- 7-10mm - using the optional Extra Height Stacker Kit
- 11-14mm - using the optional Extra Height Stacker Kit
Cleat Types that Work with the V2 MTB Shim
- All MTB cleats, including:
- Shimano SPD
- Time ATAC
- Crank Bros.
- Look X-Track
Which MTB Shoes are Compatible with the V2 MTB Shim?
Although the V2 Mtb shim works with many brands and models of MTB shoes, it does not work with absolutely everything. Sometimes the shoe or shim can be modified with careful removal of interfering material and be made to work, and sometimes it doesn't. Shoes at the small end of the size range present more challenges than larger shoes, due to the reduced length of the sole and shape and position of the lugs.
The dimensions of the shim that go between the treads are 37.5mm wide x 62mm long, and you want a flat surface for this area to sit on.
If you find the shim kit is not compatible with your MTB shoes, contact us to request a return and refund.
Installation Instructions
Click here for installation instructions
45 reviews for FORM MTB Leg Length Shim – Walkable V2
Customer photos and videos
FORM MTB Leg Length Shim - Walkable V2
FAQs
Q. I had to tighten the cleat bolts considerably before they would stop slipping. The hard plastic piece that comes in contact with the 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.
Yes. They are compatible with almost all mountain bike cleats including but not limited to
- Shimano SPD
- Time ATAC
- Crank Bros.
- Look X-Track
All MTB-style cleat systems, including Shimano SPD, Crank Bros, and Time ATAC.
The MTB Leg Length Shim is designed to fit most MTB shoes. However, there’s a slight chance of encountering compatibility issues in rare cases. There may be fit issues with shoes that have a very narrow cleat mounting area (around 36mm). Contact us with questions.
Between 3mm – 6mm in 1mm increments, depending on how you stack the various pieces.
You can get even more height with the Form Extra Height Stacker for the V2 MTB Shim.
Q. I torque the cleat to 5 nm but I’ve had several riders have them get loose again. Do you have any experience or thoughts on this? It seems like it’s much more frequent on the MTB model than the road shims, which makes sense with all of the moving parts and layers in the MTB model.
A. Yes, more moving parts in the sense that there is more material to bed down and snug together so what seems tight enough initially wont be after a few rides. I would nto hesitate to go 6 – 8nm with those.
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.
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Just what I needed
Definitely helping! Coming back from a left TKR and L3-4 back surgery this past year, so have a lot going on I am tying to dial in. As a big MTB guy I can say this is giving me more power climbing with much less pain in my good knee, which a year ago was not the case. Definitely re-ordering when this set wears out.
I was suffering with hip and back pain due to hip stability issues associated with a leg length discrepancy. I’ve only used the leg length shim for a few rides and I can already see an improvement. The shim is stable on my off-road rides.
Amazing product. Was a game changer for me.