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 12-01-06, 03:33 PM   #1
bfloyd
Senior Member
Thread Starter
 
Join Date: Apr 2006
Location: Ohio
Bikes: vintage Raleigh
Posts: 654
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
BB spindle lengths

I just aquired a new road bike from a friend which has a triple chain ring front. I am wanting to change it to a double that I have laying around and need to know if I should change to a shorter BB spindle length. I currently have a 118 with the triple. What length would be suitable for the double (older Shimano 105)? Thanks.
bfloyd is offline   Reply With Quote
Old 12-01-06, 03:43 PM   #2
acape
Senior Member
 
acape's Avatar
 
Join Date: Jul 2005
Location: Raleigh, NC
Bikes:
Posts: 662
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I don't think you can use that bottom bracket with a double. I just purchased a 105 double crank and bottom bracket, and the spindle length for the double is 109.5 mm.
acape is offline   Reply With Quote
Old 12-01-06, 05:24 PM   #3
operator
cab horn
 
Join Date: Jun 2004
Location: Toronto
Bikes: 1987 Bianchi Campione
Posts: 28,306
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You most likely will have to change the bb to something like a 107. The specific lenght depends on which crankset you buy.
operator is offline   Reply With Quote
Old 12-01-06, 06:46 PM   #4
DMF 
Elitist Troglodyte
 
DMF's Avatar
 
Join Date: Jun 2006
Location: Dallas
Bikes: 03 Raleigh Professional (steel)
Posts: 6,924
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Is it a square taper BB? Have you measured the front chain line? Nominal on a triple is 45mm. Nominal on a double is about 42mm. But if it's a square taper, it's hard to predict how a different crank set will fit.
__________________
Stupidity got us into this mess - why can't it get us out?

- Will Rogers
DMF is offline   Reply With Quote
Old 12-01-06, 07:25 PM   #5
capwater
Senior Member
 
capwater's Avatar
 
Join Date: Dec 2004
Location: Quahog, RI
Bikes: Giant TCR Comps, Cdale R5000, Klein Q-Pro, Litespeed Siena, Piasano 105, Redline Conquest Pro, Voodoo Bizango, Fuji Aloha
Posts: 1,509
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
If the cranks are square taper, pick up a Shimano UN-53 107mm spindle length which is proper for a double crankset.
capwater is offline   Reply With Quote
Old 12-01-06, 10:31 PM   #6
bfloyd
Senior Member
Thread Starter
 
Join Date: Apr 2006
Location: Ohio
Bikes: vintage Raleigh
Posts: 654
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Yes, it is a square taper. I'll look into the UN-53 107, thanks.
bfloyd 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 06:57 AM.