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PostPosted: Thu Apr 11, 2013 8:24 pm 
Dirt Disciple

Joined: Fri May 20, 2011 9:22 pm
Posts: 95
Location: Devon
I have recently bought a tatty old 92 stump jumper that I plan to build up as a single speed!
As I bought it as a frame only I'm not quite sure what length steerer I need for the forks.

I know the forks i need are 1" and the steerer tube of frame is 90mm!

Any help would be appreciated!!

I'm after some forks in the correct length (or longer that I can cut down) and also a suitable heaset if anyone knows of any?


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PostPosted: Sat Apr 20, 2013 4:09 pm 
Old School Grand Master
User avatar

Joined: Wed Feb 20, 2008 12:21 pm
Posts: 5784
Location: Lost in Translation
rjg123 wrote:
I have recently bought a tatty old 92 stump jumper that I plan to build up as a single speed!
As I bought it as a frame only I'm not quite sure what length steerer I need for the forks.

I know the forks i need are 1" and the steerer tube of frame is 90mm!

The steerer of the original fork from my 19" '92 Stumpjumper Comp measures 125mm.

In general, you can work out the steerer length you need (for a threaded fork) by adding the head tube length to the stack height of the headset:

http://www.parktool.com/blog/repair-hel ... and-sizing

Your frame will have been made for JIS cups:

http://sheldonbrown.com/cribsheet-headsets.html

If you can't find a suitable JIS fork, you can have the head tube reamed and fit an ISO headset.


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PostPosted: Mon Apr 22, 2013 7:54 pm 
Dirt Disciple

Joined: Fri May 20, 2011 9:22 pm
Posts: 95
Location: Devon
Cheers For that one eyed Jim!!!

Think i might have found some forks now!


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