Crank / chainstay clearance- Mtbr.com
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  1. #1
    mtbr member
    Reputation: cockroach's Avatar
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    Jun 2009
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    Crank / chainstay clearance

    Recently finished building a Genesis IO, and I'm a bit concerned about the clearance between the left crank & the chainstay, it's only 2.5 to 3mm, it just looks dangerously close.
    The right crank has plenty of clearance, and I've got a good chainline with the chainring in the middle position, and the rear sprocket towards the outer end of it's range.
    I'm using a Hope SS cassette rear hub, Middleburn cranks, and a square taper BB.

    Is this tight gap a problem or not?
    If I used a longer BB axle, it would solve the problem with the left crank, but cause me problems with the right one.
    Have I missed something obvious?




  2. #2
    one chain loop
    Reputation: fishcreek's Avatar
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    Apr 2007
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    are you using 68mm bb on a 73mm bb shell? it wont hurt buying a next size longer bb too since you have the chainline adjustability on the rear.
    everything sucks but my vacuum cleaner.

  3. #3
    mtbr member
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    Fishcreek, you're a genius, that's exactly what I've done.
    Doh!
    Am I right in thinking that a 73mm BB with the same axle length will in effect move both cranks 2.5mm over? If so, that would be perfect.

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