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@colm
I have the hidden bolt 600 stem made by Nitto, just like the Dura Ace AX stem. its stamped 25.8mm and I'd like to use 25.4mm Nitto bars with it.
Ive used the nitto 25.4-26mm shim with a 26mm stem and that should also work with traditional quill stem clamps that are 25.8mm,but the Shimano 600 stem fit isnt simply a hole that is squeezed tight
an I worrying about nothing, will the tolerances be fine for .2mm difference?