Advertise on Bikeforums.net



User Tag List

Results 1 to 3 of 3
  1. #1
    Road Runner DougG's Avatar
    Join Date
    Sep 2003
    Location
    Rochester Hills, MI
    My Bikes
    Specialized Sequoia, Specialized Crosstrail, Cannondale Synapse Carbon
    Posts
    974
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    BB/Crank question

    I'm planning on replacing my Sora/Tiagra-based 3x8 speed drivetrain with 105 3x10 components this winter. Yeah, I know it would be more cost-effective to buy a new bike, but I'm doing it mostly for the fun and learning experience.

    Anyway, the one component that I have never worked on so far is the BB/crankset. My current bike (Specialized Sequoia) has a Sugino BB/crank that is listed as having a "68mm axle". Is this a standard size and can I expect that the BB for the 105 crank will install with no problems in my frame?

    Also, my current crank has 172.5mm arms. Is there any reason not to get the same length with the 105 crank? I'm strictly a recreational rider and have no particular issues with the current crank setup.

  2. #2
    Elitist Troglodyte DMF's Avatar
    Join Date
    Jun 2006
    Location
    Dallas
    My Bikes
    03 Raleigh Professional (steel)
    Posts
    6,896
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Read up on bottom brackets on Sheldon's site. The Sugino BB is not a good example for the others. The old and new (105) crank/BBs are significantly different — the 105, for instance, doesn't really have a BB.
    Stupidity got us into this mess - why can't it get us out?

    - Will Rogers

  3. #3
    Road Runner DougG's Avatar
    Join Date
    Sep 2003
    Location
    Rochester Hills, MI
    My Bikes
    Specialized Sequoia, Specialized Crosstrail, Cannondale Synapse Carbon
    Posts
    974
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by DMF View Post
    Read up on bottom brackets on Sheldon's site. The Sugino BB is not a good example for the others. The old and new (105) crank/BBs are significantly different the 105, for instance, doesn't really have a BB.
    Thanks for responding, but I probably wasn't entirely clear with my question. The bike currently has the Sugino BB & crank. I will be replacing it with a FC-5603 crankset and SM-FC5600 BB from Shimano, and was just trying to ensure that it was compatible with my frame, which I have since determined it is.

Posting Permissions

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