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How to move my crank away from the bottom bracket?

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How to move my crank away from the bottom bracket?

Old 06-24-14, 08:51 PM
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adlai
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How to move my crank away from the bottom bracket?

I have a square taper BB in a Mtn bike frame.

Crank I have is like a 46t.

It is too close to the frame. The teeth rub up against the frame.

How do I space it out?
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Old 06-24-14, 08:59 PM
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this, or google "bottom bracket spacer". of course it will shorten the other side.
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Old 06-24-14, 08:59 PM
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Originally Posted by adlai View Post
I have a square taper BB in a Mtn bike frame.

Crank I have is like a 46t.

It is too close to the frame. The teeth rub up against the frame.

How do I space it out?
You need a longer spindle on the bottom bracket. Square taper bottom brackets are cheap so it shouldn't break the bank.
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Old 06-24-14, 09:22 PM
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Originally Posted by cyccommute View Post
You need a longer spindle on the bottom bracket. Square taper bottom brackets are cheap so it shouldn't break the bank.
ah, yup, figured it out. I had installed a 110mm bracket.

Just ordered a 122.5 mm bracket.
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Old 06-26-14, 08:03 PM
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As an additional option you can also shim it out a very small amount with paper thin metal shim stock bent to cover two sides of the spindle. At the very shallow angle it has insignificant impact on concentric but can push outward the crank by a sixteenth or two. You cannot shim it nearly as much as changing spindle though. Our tandem crank was shimmed his way and we did not even know it until we took it apart for maintenance. We assembled initially without the shim and derailleur was out of adjustment. We reassembled with the shim and it was in tune again. I'd say the shim moved it out about 3/32 but that is just a guess as we never measured

Last edited by dwmckee; 07-08-14 at 09:17 PM.
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Old 06-28-14, 06:04 AM
  #6  
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Also the number of teeth of your big chain wheel, can make it tough to get the crankset close to the frame. With some MTB frames, the chainstays really flare outward. Don't forget to adjust the front derailer when done. Chris
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