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Help replacing 1" Fork

Old 03-27-10, 08:01 PM
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Help replacing 1" Fork

Got a used 99 Litespeed Ti frame and fork. Current setup is threaded, 43mm rake and 140mm steerer tube. Since I'm replacing the fork I learned there are 2 ways to go.

1. Get the Nashbar 1" carbon fork. The shortest steerer tube listed is 160mm. I think this will be the cheapest and easiest way to do it. Can I cut it to be 140mm?

2. Replace the threaded headset with a threadless setup and install a 1" full carbon fork. More $$$ but will have a more modern and lighter setup. If I go this route what type of headset will I need?

I have built a bike from the frame up so I am confident I can do this. I just need some help in getting the correct parts.
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Old 03-27-10, 08:08 PM
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There's usually enough thread on new threaded forks to cut off 20mm, but the best option is to email the seller and ask the height of the lowest thread, or the length of the thread measured from the top, and compare it to the height of your threaded headset cup.

If the fork is still in the bike, measure from the outside to the lip of the cup. It's isn't perfect, but hopefully you won't be right on the line, so the rough measure will tell you what you need. If it's borderline, you'll have to remove the fork to be sure.

If you opt to go threadless, you'll need both a headset and stem. Any standard 1" threadless headset will work, you can't use any integrated or "hidden" headsets.

Good luck whichever way you go.
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Old 03-27-10, 08:31 PM
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1" headset cups come in 30mm and 30.2mm diameters. So not every 1" headset will work; you need to measure inside spec of your headtube.
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Old 03-27-10, 08:35 PM
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If your old cups are good you can just move it over to the new fork also as mentioned above will need to be cut the new fork down to correct length and if you use another headset you need to make sure you cut for it, as it may change the length if different.
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Old 03-27-10, 08:40 PM
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Originally Posted by Drakonchik
1" headset cups come in 30mm and 30.2mm diameters. So not every 1" headset will work; you need to measure inside spec of your headtube.
Yes, I should have been clearer and said "Campy standard or 30.2mm" His 99 Litespeed will not be the comparatively rare in the USA 30.0mm JIS standard.
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Old 03-27-10, 09:28 PM
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From the top edge to the lip is about 25mm. The fork description in Nashbar says the threads go down 50mm. If I cut off 20mm there should be 30mm thread left which I guess will be adequate.

If I decide to go the threadless route I will measure the inner diameter of the headtube to make sure I get the right size.

Thanks guys. You have been very helpful.
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