the adaptors are for use with a threaded headset, (22.2 or 1inch for road) they allow you to then use an A-head stem, some are 1" but most are 1 1/8".
@rpm started
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the adaptors are for use with a threaded headset, (22.2 or 1inch for road) they allow you to then use an A-head stem, some are 1" but most are 1 1/8".