Results 1 to 4 of 4
  1. #1
    mtbr member
    Reputation: RossJamis's Avatar
    Join Date
    Aug 2013
    Posts
    382

    Bottom bracket size.

    My bottom bracket has a lot of side to side play, so I figure better replace it. Its a shimano bb51 on a Jamis Dakar xc pro. My question is this,
    I have read about different sizes so how do I know what size I need?
    When you've seen someone rupture their scrotum on a bike you won't take the standards for top tube clearance lightly!

  2. #2
    Trail Tire TV on blogger
    Reputation: thomllama's Avatar
    Join Date
    Oct 2007
    Posts
    3,979
    I believe that's a standard external BB? the only real difference in your case is if you need to use spacers or not.... most externals now will do both 68 and 73mm just with the 68 you need a few spacers...

    as long as it's a standard shimano crankset just get a new BB and look at the spacers when you take the old one off.. note where and how many.. replace the new one with the same set up and you're good to go.
    Going to try and bring Trail Tire TV back. go take a look... http://trailtiretv.blogspot.com/

  3. #3
    Plays with tools
    Reputation: customfab's Avatar
    Join Date
    Jun 2008
    Posts
    4,207
    Quote Originally Posted by thomllama View Post

    as long as it's a standard shimano crankset just get a new BB and look at the spacers when you take the old one off.. note where and how many.. replace the new one with the same set up and you're good to go.
    Better to read the instructions and install per those. Too many bad mechanics out there to just put it back together the way it came apart.

  4. #4
    Trail Tire TV on blogger
    Reputation: thomllama's Avatar
    Join Date
    Oct 2007
    Posts
    3,979
    Quote Originally Posted by customfab View Post
    Better to read the instructions and install per those. Too many bad mechanics out there to just put it back together the way it came apart.
    true, very true
    Going to try and bring Trail Tire TV back. go take a look... http://trailtiretv.blogspot.com/

Similar Threads

  1. 98 FSR Bottom Bracket Size?
    By Dads Taxi in forum Specialized
    Replies: 2
    Last Post: 10-11-2012, 03:14 PM
  2. Bottom Bracket size
    By Markleo in forum Beginner's Corner
    Replies: 8
    Last Post: 09-25-2012, 03:10 PM
  3. Bottom Bracket Size help please
    By njl1992 in forum Frame Building
    Replies: 0
    Last Post: 03-21-2012, 11:54 AM
  4. Bottom bracket size
    By adam60191 in forum Drivetrain - shifters, derailleurs, cranks
    Replies: 3
    Last Post: 03-25-2011, 06:57 AM
  5. Bottom Bracket Size
    By marxcamaro in forum GT
    Replies: 1
    Last Post: 01-05-2011, 05:04 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •