Technical & Reference Section > Tech and Restoration

Fork thread Die size

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mivvi:
Hi All, my recently purchased GT performer has the same old fork thread problem. Threads damaged from the headset being too loose. So I am getting the damaged threads welded up on the weekend but need to know what size the thread (Well more importantly the diameter size) is? I can then get a Die to re-thread it. I could work it out by measuring the diameter and I have a thread guage but don't want to get it wrong as the Die will be quite expensive to buy, I would have thought? Any one got the size? Cheers!

stidds:
I can't help on the thread size, but if the die is going to be really expensive why not take it to a bike frame repair workshop?  My local repair shop charges £15 per inch re-thread.

mivvi:
Hey Stidds, I didn't know that bike shops done that kind of thing? I might just ask in mine but im sure they would just look at it and say "God, that's an old pair of forks, they use thread less head sets these days, you want to buy a new bike! We have a special on this week!" Might give it a go though, cheers!  ;)

ash:
OK HERE GOES :D
 THREAD ON MK2 RALEIGH BURNER FORKS ???
THREAD O/D IS 25.3 MM (0.996") SO SAY 1"
THE PITCH IS APPROX 1 MM (.039")......25.6 TPI
I'M NOT AT WORK 2MORO OTHERWISE I'D GO IN AND CHECK IT ON THE SHADOWGRAPH FOR YOU
THE THREAD IS NOT IN THE ZEUS BOOK SO ITS PROBABLY A SPECIAL
HOPE THIS HELPS
ASH

stidds:
Mivvi, not many bike shops will do this service, but Argos Cycles in Bristol will, but they do make their own frames so that is probably why.  They are also predominantly a road bike manufacturer so they will not be frightened of 1" threaded as that is what road bikes still use.

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