Advertise on Bikeforums.net



User Tag List

Results 1 to 9 of 9
  1. #1
    Junior Member
    Join Date
    Jun 2011
    Posts
    15
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Eighthinch crankset with Shimano BB

    I've settled on the Eighthinch Crankset for my Bridgestone Single Speed conversion.
    On the Eighthinch site they suggest the 68 x 107 JIS style BB. The Bridgestone has a 73mm BB shell. I wrote Eighthinch and asked if the Shimano UN54 73 x 107 would work and their response was they've never seen one of their cranks used with a 73mm bottom bracket and if I can find a 73x107mm it should work. Which I did.

    They said it would still fit the 73 x 110 fine but the cranks would be farther out from
    the frame which may start messing with the chainline. They suggested I try to browse
    some forums and see if anyone else was trying to do the same compatibility.

    Should I go with the 73 x 110 and just adjust the rear chainline?
    Thanks for any and all help!

  2. #2
    Foward Leaning Attitude rithem's Avatar
    Join Date
    Mar 2005
    Location
    RHODE-MF-ISLAND
    Posts
    851
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    110 is all I see ... for a SS the 1.5mm of difference won't matter much unless you run your chain super tight, which you shouldn't anyway, the 1/8th drive train should tolerate the slight deflection, I wouldn't suggest this on fixed, some might and it might work fine. I hate noisy drivetrains and dropping chains is for numbnuts

  3. #3
    Member
    Join Date
    May 2011
    Posts
    49
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    73 is the width of the bb shell and doesnt have anything to do with the length of the spindle. if you can get the 73x107, do that. or get the 73x110 and mount the chain ring on the other side of the spider. also, there are all kinds of little tricks you can do to adjust the chain line (spacers, redishing).

  4. #4
    Junior Member
    Join Date
    Jun 2011
    Posts
    15
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Cool, Thanks for the info.
    Found this one on Ebay for $15 shipped.
    http://cgi.ebay.com/Shimano-BB-UN54-...01853083825326

  5. #5
    Veteran Bastard Scrodzilla's Avatar
    Join Date
    May 2009
    Location
    San Diego, CA
    My Bikes
    EAI Bare Knuckle / Leader 725 / 1975 Raleigh Professional Track
    Posts
    23,815
    Mentioned
    22 Post(s)
    Tagged
    2 Thread(s)
    Perfect.

  6. #6
    Senior Member Steev's Avatar
    Join Date
    Jul 2005
    Location
    Backwoods of Ontario
    Posts
    2,121
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by cocchiarell View Post
    73 is the width of the bb shell and doesnt have anything to do with the length of the spindle. if you can get the 73x107, do that. or get the 73x110 and mount the chain ring on the other side of the spider. also, there are all kinds of little tricks you can do to adjust the chain line (spacers, redishing).
    I had typed a reply saying something like that, but I did a quick check around the garage before posting and noted that the clearance between the BB flange and the inside of the crank is sometimes barely 2.5mm.
    The best thing the OP could ask is if somebody who is running this crankset on a 107mm spindle could measure the gap between the crank inside face to the BB flange to see if there's 2.5mm to spare to go to a wider shell.

  7. #7
    Veteran Bastard Scrodzilla's Avatar
    Join Date
    May 2009
    Location
    San Diego, CA
    My Bikes
    EAI Bare Knuckle / Leader 725 / 1975 Raleigh Professional Track
    Posts
    23,815
    Mentioned
    22 Post(s)
    Tagged
    2 Thread(s)
    My wife had an EighthInch crankset for a while and found that with the chainring on the outside of the spider, she actually needed a 103mm spindle for a straight chainline. A 107 may put your chainline off by a few mm (which is no big deal) but solve any clearance issues.
    Last edited by Scrodzilla; 06-29-11 at 08:15 PM.

  8. #8
    Junior Member
    Join Date
    Jun 2011
    Posts
    15
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Awesome. Thanks for the input. Just got my frame back from the powder coater and looking to get started on the build!

  9. #9
    old legs
    Join Date
    Aug 2009
    Posts
    953
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Scrodzilla View Post
    My wife had an EighthInch crankset for a while and found that with the chainring on the outside of the spider, she actually needed a 103mm spindle for a straight chainline. A 107 may put your chainline off by a few mm (which is no big deal) but solve any clearance issues.
    This........... I have a 103mm spindle on my Dawes SST and I'm running an Eightinch Crankset...... it works

Posting Permissions

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