Light Makes Right
Join Date: Apr 2005
Location: Green Mountain, Colorado
Bikes: Gianni Motta Criterium, Dean Hardtail
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You've got your ends mixed I think. The mix of units is the clue. A MTB bar clamp may be exactly 1 inch, but it is specified as 25.4mm to contrast with the 26mm road clamp size.
So I'm guessing you're looking at adapting a threadless-type stem to a 1" threaded fork? 22.2mm is the INSIDE diameter of a 1" threaded steer tube. So a quill-type stem, or the bottom of a threadless adaptor is 22.2mm to slide down into the tube. Then the part of the adaptor will be 1-1/8" to fit a 1-1/8" threadless stem. Threadless steer tubes don't have a standard inside diameter. It just doesn't matter. Not sure what the inside diameter of an 1-1/8" threaded steerer is. I'd measure but can't find my calipers in the garbage pit I call a garage!
First figure out what you have. Measure the O.D. and determine if its threadless or threaded. If it's threadless, it'll most likely be 1-1/8" and just get a standard 1-18" stem. If it's threaded, get a standard 1-1/8" stem and one of these to match your measured O.D.:
Don't get blown out into the weeds with the measurements. Your stuff IS standard - I guarantee it. So just get stuff that says it matches the standard. An MTB stem in whatever length and rise you want to fit you, then the adaptor you need - either an adaptor for 1-1/8" or 1".
The only complication with a threadless stem is if it's Oversized or not. This just refers to the bar clamp and just means if you get an O/S stem, you'll need an O/S bar.
Last edited by GV27; 06-04-05 at 10:07 AM.