Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
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22.2 (7/8") is the long time standard quill diameter for 1" forks. If your current quill has a 25.4mm (1") OD then it's for a threaded 1-1/8" fork. There were a number of these made in the early days of mtb, before threadless became dominant.
If you need an adapter for to use a threadless stem on the same fork you need to find one with a 1" OD in the section that fits into the fork. (assuming you do, in fact, have a 1-1/8" threaded fork)
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