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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 09-26-06, 02:24 AM   #1
mcoomer
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Bottom Bracket Size???

I'm sure that the info is in here somewhere but my searches have returned so many hits I can't dig it out. I have an '06 Specialized Tarmac and I want to find the size and thread for the bottom bracket. Where can I find that? Is it printed on the bearing shells somewhere or do I need to measure?

Thanks in advance,
Mike
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Old 09-26-06, 03:56 AM   #2
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Forgot to ask one final question. Does the fact that I seem to be unable to determine the BB size for my bike reflect poorly on my mental capacity?
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Old 09-26-06, 07:43 AM   #3
TallRider
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In all likelihood your frame has a 68mm English-threaded bottom bracket shell. It's the standard on nearly all modern bikes, and certainly on anything made by specialized.

The type of bottom bracket (square-taper, integrated, or Octalink/ISIS) and the length of its spindle depends on the crank you're using it with and the spacing of your rear hub in order to get proper chainline. If you're just replacing a current bottom bracket and the chainline is good as-is, then just get one of the same size.

I won't comment on your mental capacity because I have very little information to go on. You mught just know relatively little about bikes.
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