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 08-19-08, 12:12 AM   #1
thirdin77
Senior Member
Thread Starter
 
Join Date: Jul 2007
Location: San Jose, Ca
Bikes: 09 Specialized Tricross Sport
Posts: 1,213
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
MTB crankset + 130mm hub = bad chainline?

Hello all,
I'm looking into doing a build of a light touring road bike and I want to have lower gearing but I also want close ratios and higher end components. My initial thought has been to get a road cassette for the close ratios and an MTB crankset for effectively lower gears, namely 48/36/26 rings.

So I viewed a recent QBP catalog and in it was listed Ultegra 9-speed shifters, and Ultegra 9-speed cassette and an Ultegra 9/10-speed rear derailleur. For a crankset, I was thinking about getting a Shimano XT 48/36/26 crankset. All 9-speed Shimano stuff so I shouldn't have any chain compatibility issues.

Now the problem, as cited from BTI-USA:
Includes 4-bolt 22/32/44t (M770) or 26/36/48t (M771) chainrings and BB set for 50mm chainline (135mm rear spacing)

Uh oh. I was going to use 130mm hubs with a 130mm rear-spaced road frame.

Can I just use a different bottom bracket that will give me a chainline more compatible with my road hub?

Last edited by thirdin77; 08-19-08 at 12:17 AM.
thirdin77 is offline   Reply With Quote
Old 08-19-08, 01:04 AM   #2
JiveTurkey
Low car diet
 
JiveTurkey's Avatar
 
Join Date: Aug 2007
Location: Corvallis, OR, USA
Bikes: 2006 Windsor Dover w/105, 2007 GT Avalanche w/XT, 1995 Trek 820 setup for touring, 201? Yeah single-speed folder, 199? Huffy tandem.
Posts: 2,407
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by thirdin77 View Post
Can I just use a different bottom bracket that will give me a chainline more compatible with my road hub?
Edit: the M771 uses a 2-piece crankset in which the spindle is permanently attached to the drive-side crank. You cannot swap spindles. Go with an older version or with another crankset that uses an Octalink, ISIS, or square-taper bottom bracket.

Last edited by JiveTurkey; 08-19-08 at 01:17 AM.
JiveTurkey 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 07:16 PM.