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I was asking more about using a shim on a carbon steerer
That's fine; if you want to play safe:
1.Make sure you thoroughly deburr and chamfer all the edges which contact the steerer
2.Use a shim that's slightly taller than the stem with some 1ā " spacers covering the projecting ends
3.Use a turned and milled shim in preference to a stamped and rolled one
gbj_tester
Iām not really worried about the steerer, just looks pretty tiny after riding with a tapered head tube.
I was asking more about using a shim on a carbon steerer.