Advertise on Bikeforums.net



User Tag List

Results 1 to 3 of 3
  1. #1
    Senior Member
    Join Date
    Jul 2005
    Location
    Charleston, SC
    Posts
    672
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    BB question (about measuring, etc.)

    So I measured my bottom bracket. The width of the BB on the frame is 68mm. The spindle length is *approximately* 132mm.

    My front chainline is about 47-48mm. My rear chainline is about 46 mm.

    I heard the Sugino RD cranks go well with a 103mm BB (From Shants). Where does this 103mm come in? Does this mean spindle length...??

    Does my spindle right now just seem abnormally long? I was sure not to measure the screw parts, just to the end of the trapezoidal parts.

    How are the Sugiono RD cranks going to fit? Should I get a new BB?

    Thanks!

  2. #2
    greatest man alive moz138's Avatar
    Join Date
    Mar 2006
    Location
    oneco
    My Bikes
    basso track, rossin track, diamond and ruby studded pocket bike.
    Posts
    224
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    what kind of bottom bracket? someone might correct me here but this might be a case of iso verse jis?
    "besides me, everyone else in sarasota florida with a "fixed gear bike" can get f*cked.. this includes but is not limited to, ringling art nerds, new college hippies, nathan fabian, and the dude that lives down street.

  3. #3
    jack of one or two trades Aeroplane's Avatar
    Join Date
    Jun 2005
    Location
    Suburbia, CT
    My Bikes
    Old-ass gearie hardtail MTB, fix-converted Centurion LeMans commuter, SS hardtail monster MTB
    Posts
    5,636
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by moz138
    what kind of bottom bracket? someone might correct me here but this might be a case of iso verse jis?
    That has nothing to do with this at all. He is talking about spindle length.

    The OP's BB is pretty long, but it's nothing that can't be fixed. For each mm that you want the chainline moved in, subtract 2mm from your existing spindle length. I'm assuming you already have the RD cranks set up on the 132mm spindle, and have a 48mm chainline. If so, then since you probably want to lose about 6mm (for the fabled 42mm chainline), you should use a 120mm spindle, if at all possible.

    That said, I have RD's too and I have them on a 110mm spindle with no problems. Are you sure you're measuring things right?
    Quote Originally Posted by Dr Irwin Goldstein
    Men should never ride bicycles. Riding should be banned and outlawed. It is
    the most irrational form of exercise I could ever bring to discussion.

Posting Permissions

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