Bicycle Mechanics - upgrading old road bike, fork/headset and BB
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07-19-11, 03:47 AM
I want to convert a threaded to a threadless fork system. Is it just buy all 1-1/8" parts?
Can I put a mega exo or shimano exo on a older frame? Just need to get the width right?
07-19-11, 03:58 AM
For the threadless fork conversion you'll need - new fork, headset and stem.
As far as the BB goes, are you using the same cranks? Is the crank square taper ( you stated it's for an older frame )?
07-19-11, 04:07 AM
yes, 1-1/8th right?
NO I already know the cranks have to match the new BB.
07-19-11, 08:56 AM
If the bike is pretty old, like before the early '90s, then you will want 1" fork/headset/spacers/stem. The best thing to do is to measure the steerer tube outer diameter, but if you have a quill stem now, you'll want 1". I'd stay with threaded, personally. Nothing wrong with threaded headset/forks/stems, and it looks more period correct. But there are a couple of different standards for 1" threaded headset- ISO, JIS and French, each with slightly different parameters.
As far as the bottom bracket goes, measure the shell width- if it's 68 mm and the bike isn't French then you're golden- use British standard. Otherwise, there are Swiss, French, Italian, Raleigh Proprietary, Ashtabula, Thomson, all kinds of other standards that each require a different solution.
I guess the question is: What year and brand of bike is it?
+10. Without knowing which bike, there are a multitude of bb threading. Just finished with a bike that had Swiss threads, bike before that was French, bike before that was British standard. Next in line is Ashtabula.
07-19-11, 11:14 AM
The probability of your older frame having a 1-1/8" headtube is low. Have it measured but I expect you will need a 1" fork and headset. Most 1-1/8" stems come with a 1-1/8" to 1" reducing shim so that should be ok.
07-19-11, 09:42 PM
its definitely a 1 inch.
raliegh r700. not sure the year but it has Down Tube shifters and easton program 3 maintubes.
raliegh pursuit. 80's
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