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Ahead or quill stem?If it's Ahead, 1" stems aren't common; far easier to use a 1 1/8" stem with a shim to reduce it to 1".If it's a quill stem, OS clamps aren't common (if available at all) and he'll need new handlebars that fit the stem, which will be either 26.4mm, 26.0mm or 25.4mm.
Alternatively, you can use a threaded-to-threadless converter as described above.
Do you already have a quill stem?
Scilly.Suffolk
@Dropped.Bars
Hi everyone,
I'm rebuilding a bike for a friend, the frame requires a 1 inch stem but the handlebars he has given me need a 31.8mm clamp. How can I resolve this for him?
Thanks in advance