Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 02-12-09, 02:40 PM   #1
sunstealth
Membre Québécois
Thread Starter
 
sunstealth's Avatar
 
Join Date: Jun 2008
Location: montreal, Quebec
Bikes: shwinn mountain bike,nakamura touring bike,and some others
Posts: 212
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
elongating tread on a suspension fork

found a good deal on a RST suspension (brand new, still in th air tight wrap) for only 45$

It may not be the best of suspension fork but for my spare bike it is enough (reason im changing the surrent one is it does bottom out and its a non servicable fork)

theres only a little problem, the treaded part isnt long enough for the head tube lenght, would i be better to retread the fork, add spacers on top of the upper headset cup or verify if i can use my curent for treaded tube ?

im at a loss here
sunstealth is offline   Reply With Quote
Old 02-12-09, 03:10 PM   #2
daintonj
Senior Member
 
daintonj's Avatar
 
Join Date: Apr 2008
Bikes:
Posts: 372
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Can we have some pictures of this as I've never heard of a threaded suspension fork. I thought they there all either 1 /18" or 1 1/2" threadless.
daintonj is offline   Reply With Quote
Old 02-12-09, 03:21 PM   #3
CCrew
Older than dirt
 
CCrew's Avatar
 
Join Date: May 2008
Location: Winchester, VA
Bikes: Too darn many.. latest count is 11
Posts: 5,343
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by daintonj View Post
Can we have some pictures of this as I've never heard of a threaded suspension fork. I thought they there all either 1 /18" or 1 1/2" threadless.
I've seen several.
CCrew is offline   Reply With Quote
Old 02-12-09, 03:40 PM   #4
CACycling
Senior Member
 
CACycling's Avatar
 
Join Date: Feb 2008
Location: Oxnard, CA
Bikes: '08 Fuji Roubaix RC; '07 Schwinn Le Tour GS; '92 Diamond Back Ascent EX
Posts: 4,565
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Assuming you mean that the threads don't go far enough down the steerer, you need to have threads cut. There is no good way to space a threaded headset that I've ever encountered.
CACycling is offline   Reply With Quote
Old 02-12-09, 05:02 PM   #5
frankenmike 
mechanically sound
 
frankenmike's Avatar
 
Join Date: Jan 2007
Location: Dover, NH
Bikes: rigid 29er moto, s-works stumpjumper fsr,black fixie,masi roadbike, ugly old hardrock commuter
Posts: 1,364
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Quote:
Originally Posted by CACycling View Post
Assuming you mean that the threads don't go far enough down the steerer, you need to have threads cut. There is no good way to space a threaded headset that I've ever encountered.
+1- try to locate a shop that can do this- no big deal, if they have the proper tool.
frankenmike is online now   Reply With Quote
Old 02-12-09, 05:23 PM   #6
daintonj
Senior Member
 
daintonj's Avatar
 
Join Date: Apr 2008
Bikes:
Posts: 372
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by CCrew View Post
I've seen several.
Must have been before my time then. Learn something new everyday.
daintonj is offline   Reply With Quote
Old 02-12-09, 06:42 PM   #7
CACycling
Senior Member
 
CACycling's Avatar
 
Join Date: Feb 2008
Location: Oxnard, CA
Bikes: '08 Fuji Roubaix RC; '07 Schwinn Le Tour GS; '92 Diamond Back Ascent EX
Posts: 4,565
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
One other issue. You might run into a problem getting the keyway cut as I'm assuming it only goes to the bottom of the existing threads.
CACycling is offline   Reply With Quote
Old 02-12-09, 07:09 PM   #8
Retro Grouch 
Senior Member
 
Retro Grouch's Avatar
 
Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Catrike 559, Merin Bear Valley (beater bike).
Posts: 26,535
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 58 Post(s)
I've got hand dies for cutting additional threads onto fork steerers so I've actually done it. Adding additional threads isn't too technical but it is physical work. How much additional threaded length do you need?

After you get the additional threads cut you'll probably want to cut the excess length off of your steerer. Measure twice and cut once. The only bike mechanics I know who won't claim having cut at least 1 steerer too short are all liars. And don't be tempted to cut it to length before you get the additional threads cut. Extending a thread is one thing, starting a new thread is something else entirely.

I wouldn't worry about extending the key way if your fork has one. Just use a headset washer without the tongue and hold the upper race with a headset wrench while you tighten the lock nut.
Retro Grouch is offline   Reply With Quote
Old 02-12-09, 09:14 PM   #9
CCrew
Older than dirt
 
CCrew's Avatar
 
Join Date: May 2008
Location: Winchester, VA
Bikes: Too darn many.. latest count is 11
Posts: 5,343
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by daintonj View Post
Must have been before my time then. Learn something new everyday.
Naa, just not that common, so you prolly just haven't come across one. My LBS has two used RockShox ones hanging on the wall though, so I know they're out there. That said, even I can't recall seeing one on a bike anytime recently. And I prolly have a few years on ya

-R
CCrew is offline   Reply With Quote
Old 02-12-09, 11:46 PM   #10
sunstealth
Membre Québécois
Thread Starter
 
sunstealth's Avatar
 
Join Date: Jun 2008
Location: montreal, Quebec
Bikes: shwinn mountain bike,nakamura touring bike,and some others
Posts: 212
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
just for a little information I got the bike when i was in 6th grade so back in 1998 maybe it explains the treaded fork

I got a price for a die , they are hella expensive almost 40$ while getting it done by a machine shop is less than 10$

oh yeah and about cutting it, ill measure the old one, install in frame, measure again, install the bolt which holds it in place, re measure than cut

past experience with exhaust and adapter plates and roll cage cut too short on my old rally car made me aware of the measure twice cut once saying!
sunstealth is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 05:16 PM.