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Threaded fork to threadless fork(8 posts)

Threaded fork to threadless forkOB1
Jul 10, 2001 4:11 PM
I have an uncut Kinesis 2 fork that is threaded, is it advisable to cut the threads off to go threadless? What is the fork length equation so I don't cut off too much? Thanks.
re: Threaded fork to threadless forkgrz mnky
Jul 10, 2001 4:42 PM
Off hand I don't see why not as long as you're clear of any threads or alignment groove (keyway). You'll have to ask yourself just what you're trying to achieve since you won't save much weight (steel steerer) and you have to buy/modify your headset and buy a new stem, and some spacers. Personally I like the threadless since it does give you the ability to reduce weight (approx 1/2 lbs. w/carbon steerer), and reduce flex between the stem and steerer. Plus, I like the looks.

The "best" way to get the cut in the right place is to wait until *all* parts are on hand (stem, headset, spacers) assemble everything, measure the excess - twice, and then cut it in the morning (when the brain is functioning correctly) using a guide. You can always make it shorter, but you can't make it longer.
re: Threaded fork to threadless forkOB1
Jul 10, 2001 6:43 PM
Thanks, as you can tell, I'm moving from the MTB arena to Tri's. Besides weight, are they're any other disadvantages to threaded?
re: Threaded disadvantage....Rusty Coggs
Jul 10, 2001 7:38 PM I see mentioned alot is if it loosen while riding, you probably won't have a headset wrench to tighten it,wheras, you may more likely have or be able to borrow the typical 5m hex wrench to tighten/adjust a threadless one. However, I have never had a properly installed and adjusted threaded one loosen and that has invloved LOTS of bikes.So maybe it's a non issue?
re: Threaded disadvantage....OB1
Jul 10, 2001 7:59 PM
Sir, if I'm doing tri's and it seems to be important, how much average weight savings could be expected, assuming you have a carbon fork, Al frame, and light race wheels? I'm just wondering if I should sell it to go with the masses to threadless. Thanks for your time.
Probably won't workSpoke Wrench
Jul 11, 2001 11:49 AM
Threadless forks steer tubes have to be quite a bit longer than threaded ones because they have to extend nearly all the way through the stem (don't forget to allow for enough spacers to raise the handlebar to the preferred height).

The fork makers say you shouldn't use a threaded fork in a threadless system. They are afraid the steer tube might snap off at the threads.
The only way it will workKerry Irons
Aug 23, 2001 7:24 PM
Is if the fork is for a very large frame, and you're using it on a very small frame. IOW, when you cut the steerer tube off at the last thread, there is enough protruding from the head tube for a couple of spacers and the stem clamp. Not likely.
The only way it will workOB1
Jul 11, 2001 8:45 PM
Thanks for all of your help, guys. Right tool for the right job. Going to stay threaded for awhile.