Advertise on Bikeforums.net



User Tag List

Results 1 to 9 of 9
  1. #1
    Senior Member
    Join Date
    Aug 2005
    Posts
    371
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    how to move bb axle, for fixed gear.

    I am trying to build a fixed gear. How do you adjust the bb axle?
    thanks in advance

  2. #2
    cyclist/gearhead/cycli... moxfyre's Avatar
    Join Date
    Oct 2004
    Location
    DC / Maryland suburbs
    My Bikes
    Homebuilt tourer/commuter, modified-beyond-recognition 1990 Trek 1100, reasonably stock 2002-ish Gary Fisher Hoo Koo E Koo
    Posts
    4,182
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Adjust the BB axle... what do you mean? Are you trying to clean and regrease it? Are you trying to move it side to side (adjust the chainline)?
    My bikes | Linux and Python stuff | Photo gallery

    Sheldon Brown, I miss you. Thanks for the advice, ideas, humor, and infectious enthusiasm for everything bikes...

  3. #3
    Senior Member
    Join Date
    Aug 2005
    Posts
    371
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I am trying to move it from side to side to adjust chainline. It is a nonsealed 3 piece bb

  4. #4
    cyclist/gearhead/cycli... moxfyre's Avatar
    Join Date
    Oct 2004
    Location
    DC / Maryland suburbs
    My Bikes
    Homebuilt tourer/commuter, modified-beyond-recognition 1990 Trek 1100, reasonably stock 2002-ish Gary Fisher Hoo Koo E Koo
    Posts
    4,182
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by fadetoblack6902
    I am trying to move it from side to side to adjust chainline. It is a nonsealed 3 piece bb
    Ah, okay. Well, unfortunately, there's basically only one bit of side-to-side adjustment that you can do with a standard cup-and-cone BB: you can remove the spindle and flip it around. That will typically move the chainrings 5 mm closer to the frame, and of course it will move the left crank 5 mm further away too.

    If you need to adjust the chainline precisely, you'll probably have to get a new BB spindle (cheap these days, most LBSes would probably give you one for $5 or something). The other option is to get a spacer which sits in between the BB cup and the frame on the right side... but that will only allow you to move the chainrings further OUT, not further IN.
    My bikes | Linux and Python stuff | Photo gallery

    Sheldon Brown, I miss you. Thanks for the advice, ideas, humor, and infectious enthusiasm for everything bikes...

  5. #5
    Senior Member
    Join Date
    Aug 2005
    Posts
    371
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    thanks, i'll try a spacer. I only need to move the chainwheel slightly to the right.

  6. #6
    cyclist/gearhead/cycli... moxfyre's Avatar
    Join Date
    Oct 2004
    Location
    DC / Maryland suburbs
    My Bikes
    Homebuilt tourer/commuter, modified-beyond-recognition 1990 Trek 1100, reasonably stock 2002-ish Gary Fisher Hoo Koo E Koo
    Posts
    4,182
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by fadetoblack6902
    thanks, i'll try a spacer. I only need to move the chainwheel slightly to the right.
    Sounds good. If the change you're talking about is 1 mm or so... you can flip the chainring over Most chainrings have the teeth slightly off-center, allowing you to change their position by flipping the ring.
    My bikes | Linux and Python stuff | Photo gallery

    Sheldon Brown, I miss you. Thanks for the advice, ideas, humor, and infectious enthusiasm for everything bikes...

  7. #7
    Senior Member
    Join Date
    Aug 2005
    Posts
    371
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I think it may need a bit more than that. What do you recommend using as a spacer?

  8. #8
    Has opinion, will express
    Join Date
    Jun 2003
    Posts
    11,701
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by fadetoblack6902
    thanks, i'll try a spacer. I only need to move the chainwheel slightly to the right.
    The one problem in adding a spacer on the driver side with a cup-and-cone system is ensuring you still have enough thread on the adjustable cone on the left side to fit the lockring. If you can't thread on the lockring with at least two threads, your adjustment won't work.

  9. #9
    cyclist/gearhead/cycli... moxfyre's Avatar
    Join Date
    Oct 2004
    Location
    DC / Maryland suburbs
    My Bikes
    Homebuilt tourer/commuter, modified-beyond-recognition 1990 Trek 1100, reasonably stock 2002-ish Gary Fisher Hoo Koo E Koo
    Posts
    4,182
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by fadetoblack6902
    I think it may need a bit more than that. What do you recommend using as a spacer?
    You can buy a BB spacer from www.loosescrews.com for about $1. Do note Rowan's point: if you have to move the BB more than a couple mm to the right, you'll likely not have enough adjustable cup threads sticking out on the left side to secure the lockring to. Personally, I would probably just by a $15 cartridge BB from Nashbar at that point

    I'm a bit surprised that you have to move the chainrings AWAY from the frame. With most converted fixies, I find that the chainrings need to be moved CLOSER to the frame to match up with the chainline of typical track cranks.
    My bikes | Linux and Python stuff | Photo gallery

    Sheldon Brown, I miss you. Thanks for the advice, ideas, humor, and infectious enthusiasm for everything bikes...

Posting Permissions

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