Advertise on Bikeforums.net



User Tag List

Results 1 to 6 of 6
  1. #1
    car dodger norskagent's Avatar
    Join Date
    Aug 2005
    Location
    garner/raleigh nc
    Posts
    3,285
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)

    vintage bottom bracket quizzz

    According to this: http://www.campyonly.com/history/1974/chainlines.pdf
    There is a 1mm difference between a 68-SS-120 BB chainline, and a 68-P-120 BB chainline.
    I have the 68-SS-120 bottom bracket. So the question now is, where would a campy pista chainring line up on the spindle, closer to the inner or outer chainring, or "centered" at 43.5mm?
    1989 Schwinn Paramount OS
    1980 Mclean/Silk Hope Sport Touring
    1983 Bianchi pista
    1976 Fuji Feather track
    1979 raleigh track
    "I've consulted my sources and I'm pretty sure your derailleur does not exist"

  2. #2
    Old fart JohnDThompson's Avatar
    Join Date
    Nov 2004
    Location
    Appleton WI
    My Bikes
    Several, mostly not name brands.
    Posts
    12,608
    Mentioned
    9 Post(s)
    Tagged
    0 Thread(s)
    The 68-SS-120 is a road spindle, intended for use with double chainrings. If you're using a road crank, running the chainring on the inner plateau should give you a good chainline. If you're using a track crank, you'll want the 68-P-120 spindle (unless you have an old frame with 110mm rear dropout spacing, in which case you'll want the 68-P-110).

  3. #3
    car dodger norskagent's Avatar
    Join Date
    Aug 2005
    Location
    garner/raleigh nc
    Posts
    3,285
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    I want to use a track crank on a road spindle. The link above indicated that the 2 chainlines are only ~1mm different, assuming my track chainring is at the 43.5 road chainline. I don't want to spend big $ for a track bottom bracket just to perfect my chainline by a millimeter.
    1989 Schwinn Paramount OS
    1980 Mclean/Silk Hope Sport Touring
    1983 Bianchi pista
    1976 Fuji Feather track
    1979 raleigh track
    "I've consulted my sources and I'm pretty sure your derailleur does not exist"

  4. #4
    Old fart JohnDThompson's Avatar
    Join Date
    Nov 2004
    Location
    Appleton WI
    My Bikes
    Several, mostly not name brands.
    Posts
    12,608
    Mentioned
    9 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by norskagent View Post
    I want to use a track crank on a road spindle. The link above indicated that the 2 chainlines are only ~1mm different, assuming my track chainring is at the 43.5 road chainline. I don't want to spend big $ for a track bottom bracket just to perfect my chainline by a millimeter.
    If you already have the parts you're proposing to use, you have nothing to lose by trying it.

  5. #5
    car dodger norskagent's Avatar
    Join Date
    Aug 2005
    Location
    garner/raleigh nc
    Posts
    3,285
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    I did - I think it's pretty close. I measured a hair over 43mm at the chainring, and right at 43mm at the rear cog. I put a 0.5mm spacer between the cog and hub. I haven't ridden it yet but hopefully it will run smooth and silent. Also, there was only ~2mm clearance between the chainring and chainstay. Here's a pic, taken just a few minutes after I finished.
    1989 Schwinn Paramount OS
    1980 Mclean/Silk Hope Sport Touring
    1983 Bianchi pista
    1976 Fuji Feather track
    1979 raleigh track
    "I've consulted my sources and I'm pretty sure your derailleur does not exist"

  6. #6
    Senior Member BoozyMcliverRot's Avatar
    Join Date
    Jan 2007
    Location
    bradenton FL
    My Bikes
    06 Motobecane SS/FW, early 90's Specialized Sirrus fixie
    Posts
    941
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Very nice ride.But i wouldnt worry at all about a 1 or 2mm diff.
    http://t2.gstatic.com/images?q=tbn:A...RVDGNYp-tthdQY How do hotdogs survive in the wild with no eyes or legs??

Posting Permissions

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