My partner uses a 5mm SPD shim and a 5mm orthotic on her SPD shoes. The shim isn’t perfect but it is walkable enough. https://shop.cyclefit.co.uk/products/leg-length-shim-mtb-walkable
She previously used cranks with 5mm different lengths without issues on 1200km brevets.
I have used them before and I found that the cleat will move over time. Speedplay use to do mountain bike pedal that dealt with leg length discrepancy but they stopped making them. It is a huge gap in the spd market for a solution to this issue
@omash27 started
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My partner uses a 5mm SPD shim and a 5mm orthotic on her SPD shoes. The shim isn’t perfect but it is walkable enough.
https://shop.cyclefit.co.uk/products/leg-length-shim-mtb-walkable
She previously used cranks with 5mm different lengths without issues on 1200km brevets.