Light Makes Right
Join Date: Apr 2005
Location: Green Mountain, Colorado
Bikes: Gianni Motta Criterium, Dean Hardtail
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Oh, I know your problem. A lot of threadless forks have a butted steerer. That is, the wall thickness changes along it's length, usually getting thicker as it get closer to the crown. I'll bet that's your issue. Threading a threadless steerer is not at all recommended. Even if it's not butted, the inside is not designed to take a stem and probably has an uneven finish. You could have a machine shop machine the inside of the steerer to an even diameter but that's DEFINITELY a BAD idea.
Get a fork with a threaded (from the factory) steerer.
edit: getting it machined/reemed wouldn't be a bad idea - it's be a HORRIBLE idea. Feasible - but only if you don't value your own life.
Last edited by GV27; 02-19-09 at 07:34 PM.