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FORM Extra Height Stacker for V2 MTB Shim
Need more lift than the standard Form MTB V2 Leg Length Shim allows? The FORM Extra Height Stacker adds up to 11–14mm of total stack height, providing a clean, secure solution for cyclists managing significant leg length discrepancies.
$22.50
Cyclists dealing with significant leg length discrepancies often need more than the standard 3mm shim. That’s where the FORM Extra Height Stacker for V2 MTB Shim comes in.
If you’re already using the FORM V2 Walkable MTB Shim and need more stack height beyond the usual 3–6mm range, this add-on kit gives you a clean, stable way to increase lift without compromising walkability or cleat position. It replaces the 2mm stacker that ships with the base V2 shim and includes a taller stacker plus an optional clip-on spacer to further increase height.
Two versions of the kit are available depending on the target lift range:
- 4/6 mm kit for total stack heights of 7–10 mm
- 8/10 mm kit for total stack heights of 11–14 mm
See below for the full contents of each.
Features & Benefits
- Extend your stack height range: Tackle leg length discrepancies by adding more height to your FORM V2 MTB Shim.
- Modular and adjustable: Choose between two kits depending on how much lift you need, with the ability to fine-tune using the clip-on spacer set.
- Secure cleat placement: Includes extended cleat plate and longer mounting hardware to ensure everything stays tight and aligned under real-world riding loads.
- Walkable and practical: Maintains the walkable design of the original V2 shim. No bulky hacks or DIY foam stackers here.
- Built for durability: High-quality materials, CNC machined and molded in the UK.
What’s in the Box?
4/6 mm Kit (Total Stack Height: 7–10 mm)
- 4mm extended stacker
- 2mm clip-on spacer set
- Cleat plate
- Shim screws
- Cleat screws
8/10 mm Kit (Total Stack Height: 11–14 mm)
- 8mm extended stacker
- 2mm clip-on spacer set
- Cleat plate
- Shim screws
- Cleat screws
Note: This kit does not include the base 3mm shim. You’ll need to purchase the FORM Walkable MTB Shim V2 separately.
Made in the United Kingdom
5 reviews for FORM Extra Height Stacker for V2 MTB Shim
FORM Extra Height Stacker for V2 MTB Shim
FAQs
With the base V2 shim (3–6mm) plus the 8/10mm stacker kit, you can achieve up to 14mm of total stack height. The 2mm clip-on spacer included in each kit lets you fine-tune within the range.
No. The kit includes an extended cleat plate and longer mounting hardware to accommodate the added height. Your existing SPD, Time ATAC, Crank Bros, or other 2-hole MTB cleats will work fine.
No, the kits aren’t designed to stack on top of each other. Choose the 4/6mm kit for 7–10mm total stack height, or the 8/10mm kit for 11–14mm total. If you need more than 14mm of correction, other interventions may be more appropriate. Reach out to us or talk to your local professional bike fitter.
No. The Extra Height Stacker is designed exclusively for the FORM V2 Walkable MTB Shim. The mounting geometry and hardware are different between versions, so the stacker won’t fit the V1.
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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The only reason I don’t have a 5 star review is that the heads on the screws were not big enough and fell right through the plates for my cleats. Luckily my PT had plates with smaller holes that are holding the screws in place.
Very easy to install. I noticed a difference right away!
I experience moderately severe low back pain and hip pain due to limb length inequality. My pelvis and hip would rock from side to side and come off the saddle while riding due to the inequality.
Your shim has significantly lessened my discomfort and has restored my hip and pelvis mechanics to near normal. I am quite grateful for your products. As a retired health care professional, I saw many people with limb length inequality. I suspect your products are vastly underutilized and hope that your products become more widely used.
Many thanks!