Reviving this rather than creating a new thread but has anyone tried shimming a 1" (25.4mm) steerer for a 1 1/4 (31.8mm) stem? I know that 1"-1 1/8 exists so surely you can do the same just with a thicker shim to accommodate the stem?
I spoke to a mechanic who was very unkeen on the idea but I've got a stem and bar combo I had planned to use and would quite like to stick with...
As steerer shims are single piece slotted, the problem is going to be compressing the shim in order to clamp everything up.
28.6mm (1 1/8”) - 25.4mm (1”) is a difference of 3.2 so shim wall thickness will be 1.6mm.
At 31.8mm - 25.4mm the difference is doubled to 6.4mm so shim wall thickness would be 3.2mm.
You may exceed the torque rating of the stem before you reach a satisfactory clamping force.
As shims to do the job don’t actually (afaik) exist and you’ll be having to make/have one made then you could go for a two piece design but poor alignment of the pieces may cause issues.
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