Go Back  Bike Forums > Bike Forums > Touring
Reload this Page >

need help on where to purchase a 121 square taper JIS axle

Notices
Touring Have a dream to ride a bike across your state, across the country, or around the world? Self-contained or fully supported? Trade ideas, adventures, and more in our bicycle touring forum.

need help on where to purchase a 121 square taper JIS axle

Old 10-30-13, 05:04 PM
  #1  
jgscisum 
Senior Member
Thread Starter
 
Join Date: Aug 2004
Location: Central Kentucky
Posts: 122
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Likes: 0
Liked 1 Time in 1 Post
need help on where to purchase a 121 square taper JIS axle

Hey everyone. Doing a 1970's Italian touring frame build up. I can't seem to find a 121mm JIS spindle/axle, square taper anywhere. I have a perfectly good loose bearing BB that is the correct 70mm but the axle is 115mm double and to go to a triple I need a 121 according to SB website. The crank is a Shimano Exage LX 500 or same as the later 105 cranks. Can someone steer me in the right direction, PLEASE.
jgscisum is offline  
Old 10-30-13, 05:33 PM
  #2  
djb
Senior Member
 
Join Date: Jul 2010
Location: Montreal Canada
Posts: 11,722
Mentioned: 32 Post(s)
Tagged: 0 Thread(s)
Quoted: 2146 Post(s)
Liked 544 Times in 463 Posts
I'd suggest putting this up also in the bike mechanics section, as there will be a number of knowledgeable mechanic or store guys with experience who may have an answer more quickly than here. Good luck.
djb is offline  
Old 10-31-13, 05:27 AM
  #3  
rcschafer
Senior Member
 
rcschafer's Avatar
 
Join Date: Feb 2008
Location: New Orleans, LA, USA
Posts: 269

Bikes: '59 Raleigh Lenton, '86 Peugeot PSN-10 Triathalon, '84 Peugeot PGN-10, 8? Peugeot UE-18, Peugeot NS-540, '86 Giant Iguana (Xtracycle), Holdsworth Gemini tandem, Surly Cross Check fixie, '86 Centurion MV Ironman

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Bike co-ops often have a bin of used spindles lying around...
rcschafer is offline  
Old 10-31-13, 11:35 AM
  #4  
robow
Senior Member
 
robow's Avatar
 
Join Date: Aug 2005
Posts: 3,568
Mentioned: 14 Post(s)
Tagged: 0 Thread(s)
Quoted: 435 Post(s)
Liked 131 Times in 93 Posts
Consider also posting in the "Classics and Vintage" forums here. They've always been very helpful.
robow is offline  
Old 10-31-13, 11:37 AM
  #5  
fietsbob
Banned
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 43,599

Bikes: 8

Mentioned: 197 Post(s)
Tagged: 0 Thread(s)
Quoted: 7607 Post(s)
Liked 1,322 Times in 832 Posts
Whats wrong with a mm shorter , say 120? or 2 mm 119, and a washer under the fixed Cup?
fietsbob is offline  
Old 10-31-13, 12:04 PM
  #6  
Doug64
Senior Member
 
Doug64's Avatar
 
Join Date: Mar 2009
Location: Oregon
Posts: 6,143
Mentioned: 29 Post(s)
Tagged: 0 Thread(s)
Quoted: 1031 Post(s)
Liked 434 Times in 258 Posts
I'd double check Sheldon Brown's recommendations by making some easy measurements. It does not cost anything, and easy to do.

Using your existing BB spindle install the new drive side crank arm. Measure your chainline from the center of the seat tube to the center of the middle chainring. Using calipers to measure the seat tube, divide the measurement in half and add it to the distance from the center chainring to the outside edge of the seat tube. This is an easy and accurate way of measuring chainline. If you are using road shifters and front derailleur, you will likely want a chainline close to 45 -46 mm. If the chainline with your present BB is shorter than that, add the distance needed to find the correct BB length.

example: Chainline with present bottom bracket spindle and new triple crank= 42mm.

46 mm (desired CL) - 42 mm (measured CL) = 4 mm , 4mm x 2= 8mm, 115mm + 8mm= 123mm. A 122.5 mm would work well in this case.

This exercise also works well when going from road cranks to Mtn bike cranks which require a shorter BB axle.

You can get a new Italian threaded, sealed bearing BB, for 70 mm BB shell from Universal Cycles for $13. I'd be a little leary of using a new spindle in BB cups made by a different manufacturer, even if you could find one.

https://www.universalcycles.com/shopp...2&category=347

Good luck!
Doug64 is offline  
Old 10-31-13, 07:32 PM
  #7  
Tourist in MSN
Senior Member
 
Join Date: Aug 2010
Location: Madison, WI
Posts: 8,495

Bikes: 1961 Ideor, 1966 Perfekt 3 Speed AB Hub, 1994 Bridgestone MB-6, 2006 Airnimal Joey, 2009 Thorn Sherpa, 2013 Thorn Nomad MkII, 2015 VO Pass Hunter, 2017 Lynskey Backroad, 2017 Raleigh Gran Prix, 1980s Bianchi Mixte on a trainer. Others are now gone.

Mentioned: 38 Post(s)
Tagged: 0 Thread(s)
Quoted: 2354 Post(s)
Likes: 0
Liked 597 Times in 492 Posts
Can you use a different spindle length? I recently built up a new bike from a frame and decided that I would intentionally have the chainline off by about 5mm because I did not want my Q factor to differ too much from my other bikes. Thus, my spindle is about 10mm shorter than it would be if I had a perfect chainline.
Tourist in MSN is online now  
Old 10-31-13, 10:17 PM
  #8  
hybridbkrdr
we be rollin'
 
hybridbkrdr's Avatar
 
Join Date: Oct 2009
Location: Quebec, Canada
Posts: 1,849
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 148 Post(s)
Liked 14 Times in 14 Posts
Shimano BB-UN55 square taper bottom bracket 70x122mm
https://www.niagaracycle.com/categori...e-taper-70x122
hybridbkrdr is offline  
Old 10-31-13, 10:26 PM
  #9  
hybridbkrdr
we be rollin'
 
hybridbkrdr's Avatar
 
Join Date: Oct 2009
Location: Quebec, Canada
Posts: 1,849
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 148 Post(s)
Liked 14 Times in 14 Posts
Originally Posted by fietsbob View Post
Whats wrong with a mm shorter , say 120? or 2 mm 119, and a washer under the fixed Cup?
From what I read in the mechanics forum, it depends on the bottom bracket. Shimano bottom brackets can have a lip on the non-drive side cup that prevents it from going further into the frame. Of course, there are non-drive side cups you can buy (can't remember but I think it was from Problem Solvers or Wheels Manufacturing and some by Shimano). There are also Stronglight bottom brackets that don't have the lip on the non-drive side cup.

The reason why I'm mentioning the non-drive side cup is because people have said with the BB-UN55, if someone uses a spacer they say they can't get the other side tight enough (my understanding from what I read in the BB-UN55 thread).
hybridbkrdr is offline  
Old 11-01-13, 06:29 PM
  #10  
jgscisum 
Senior Member
Thread Starter
 
Join Date: Aug 2004
Location: Central Kentucky
Posts: 122
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Thanks everyone! As luck would have it I ran across a 118mm axle and it put the chainline within 1mm. Go figure. I guess you should always check and measure yourself instead of relying on SB specs. No disrespect to SB. The info on his site is invaluable. Again Thanks to all who took the time to respond. Joe
jgscisum is offline  
Old 11-02-13, 10:48 AM
  #11  
fietsbob
Banned
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 43,599

Bikes: 8

Mentioned: 197 Post(s)
Tagged: 0 Thread(s)
Quoted: 7607 Post(s)
Liked 1,322 Times in 832 Posts
different crank arms have a different relative fit,

+ there is the stretching/ compression of the aluminum.

in older parts..
fietsbob is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Kapusta
Bicycle Mechanics
4
10-05-18 03:48 AM
whipcream103
Bicycle Mechanics
4
04-08-17 08:58 PM
atalamark
Classic & Vintage
11
06-05-16 08:10 PM
vintagerando
Bicycle Mechanics
10
09-13-15 04:16 PM
jgscisum
Bicycle Mechanics
4
10-30-13 08:07 PM

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


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.