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Old 09-22-11, 07:42 PM   #1
shortshorts
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Upgrading an old road bike's fork to threadless.

Can you swap out a 1" threaded fork with a 1 1/8" threadless fork?
I know I'd have to use a different stem and headset, but would the small increase in diameter matter at all? Would it still fit inside the head tube of the frame?
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Old 09-22-11, 07:48 PM   #2
thirdgenbird
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it wont fit inside the frame.

you could upgrade to 1in threadless but there wouldnt be any real benefit unless you planned to get a full carbon fork for the sake of weight savings.
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Old 09-22-11, 10:10 PM   #3
irclean
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FWIW, one of my bikes had a threaded headset labeled "25.4", which I originally assumed mean the headset diameter. It turns out that it instead referred to the stem diameter that would fit into the steerer tube. I was therefore able to swap a 1-1/8" threadless fork & headset for my quill stem, headset, and suspension fork. If in doubt, use Sheldon Brown's quarter method to check stem diameter.

http://sheldonbrown.com/headsets.html#size
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Old 09-23-11, 01:31 AM   #4
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Quote:
Originally Posted by irclean View Post
FWIW, one of my bikes had a threaded headset labeled "25.4", which I originally assumed mean the headset diameter. It turns out that it instead referred to the stem diameter that would fit into the steerer tube...
http://sheldonbrown.com/headsets.html#size
I think it's more likely the "25.4" referred to threading (French), not diameter.
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Old 09-23-11, 05:42 AM   #5
goatalope
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Won't fit. There are a limited number of threadless 1" forks out there. I believe Ritchey makes a carbon one, which I'd consider an upgrade over a lot of forks. I've only ever seen one full carbon 1" threadless...a colnago. Don't know if anybody makes such a thing any longer.
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Old 09-23-11, 06:14 AM   #6
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Easton 1in full carbon forks are around. I've got one sitting on the shelf.
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Old 09-23-11, 11:28 AM   #7
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Nashbar has 1" threaded ( in some lengths) and 1" threadless forks that have alloy crowns and steerers. I bought a threadless one to go on a 91 Paramount (Oversea made). The Paramount had the non-lugged crown on the stock steel fork. I like the looks of the Nasbar fork with the new stem and spacers. The carbon legs have a similar swept look as bikes of that era. Marginal weight difference between the original Paramount fork and the Nashbar carbon/alloy fork. I do like the feel with the new fork, but I like the feel of old steel bikes with any fork.
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