Aluminum drivers are 54mm diameter, ID is 16mm (.63″).
Please see my other listings for headset presses, crown race setting tools and other bike tools and parts. I can supply custom machined parts as well.
BB24 (24mm drivers), BB30 (30mm drivers), BB90/95 (24mm drivers with a 36.5mm OD), GXP (22mm driver and 24mm driver)
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