Advertise on Bikeforums.net



User Tag List

Results 1 to 3 of 3
  1. #1
    Composed Mainly of Beer
    Join Date
    Nov 2005
    Location
    South Austin, Texas
    My Bikes
    Surly CrossCheck, Centurion CompTA, Schwinn Mirada
    Posts
    186
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    38 tooth 130mm BCD chainring drags chain?

    I read on lickbike.com that with a 38t 130mm BCD chainring, the chain may drag on the crank spider.
    Is this really the case? I haven't seen it mentioned anywhere else.

    Thanks y'all,

    Lambo
    1984 Centurion Comp TA
    2001 Surly Cross Check - bean green, baby
    1985 Schwinn Mirada beater/commuter

  2. #2
    Senior Member
    Join Date
    Aug 2004
    Posts
    736
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Depends on the spider design. In theory 39T is the limit, in practice there are a number of 38T 130mm BCD rings out there, and they work on at least *some* cranks. Measure the distance from BB axis to the chain on the 39T (this should be the same number on any 39T), take off 2.6% of that (38/39), and check that there is nothing on your crank spider that intrudes in this area.

  3. #3
    Bottecchia fan
    Join Date
    Aug 2003
    Location
    Colorado Springs, CO
    My Bikes
    1959 Bottecchia Professional (frame), 1966 Bottecchia Professional (in progress...), 1971 Bottecchia Professional (frame), 1973 Bottecchia Gran Turismo, 1974 Bottecchia Special (in progress...), 1977 Bottecchia Special (frame), 1974 Peugeot UO-8
    Posts
    3,419
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I've run a 38t chainring on a TruVative Elita and an old late '80's vintage Shimano crank without any problems.

Posting Permissions

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