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Retheading a fork?(6 posts)

Retheading a fork?Mike Prince
Jan 25, 2004 12:25 PM
Long story short -- I have a very nice 20-yr old Trek lugged frame (531) that is the basis for my winter singlespeed project. As build-up prep, disassembled the original headset (Stronglight Bernard Hinault model) and found that there are a few stripped threads on the steerer tube, about 1/4" down the tube. Probably ruined the hs getting the top cup off (no big deal, I have a replacement somewhere) but the threads on the steerer are definitely damaged. Can a good LBS fix this?

Can't remember the last time I've had a shop work on any bike I've owned. Any d-i-y suggestions from the board experts before I go in search of a decent shop to re-thread the steerer?

re: Retheading a fork?Rusty Coggs
Jan 25, 2004 1:37 PM
Most shops should be able to chase and cleanup threads. I've also been the victim of incompetents that buggered things even worse. If you have a good local frame builder,that might be a better bet.
re: Retheading a fork?Mike Prince
Jan 25, 2004 1:46 PM
Thanks. I guess that's the risk of buying from ebay...fortunately that's the worst of the work that needs to be done.

Depends.Spoke Wrench
Jan 25, 2004 2:07 PM
How are the threads buggered? It's certainly possible to run a die down the fork to clean up the threads, but that isn't going to add any metal to them. Sometimes you can add or subtract a spacer under the lock nut so that it screws onto different threads. Otherwise this may be your opportunity to upgrade to a new carbon fork.
Do it your self methodflakey
Jan 25, 2004 2:25 PM
If you dont trust a shop, and dont have access or want to pay a framebuilder to fix it, try this: find a chromed steel threaded top cup from a cheap headset, and use that as a die to restore the threads so you can thread your good headset onto it. The chromed steel is pretty hard and works as a good D-I-Y method. Thread it down to the damaged section and carefully start threading a bout a half turn and then back it off and repeat until you have made the threads useable again.
Depends.Mike Prince
Jan 25, 2004 3:02 PM
Looks like part of one thread is flattened a bit. What was raised is mashed down and widened. If I get a chance tonight I'll take a picture of it and see if that shows the detail.

Lock nut is one concern, but I still need to get the threaded cup of the new headset over this section of steerer. I may have an old steel locknut around, I'll have to check and maybe that will help too.

New carbon fork may be tough - the bike is sized for 27" wheels, so I'll try to salvage this one before I go that route.