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Bottom Bracket Compatibility

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Old 12-27-11 | 10:05 PM
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Bottom Bracket Compatibility

My bike's bottom bracket width is 73mm, would a 68mm shimano 105 5700 external bottom bracket work? I have 105 cranks.
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Old 12-27-11 | 10:07 PM
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Old 12-27-11 | 10:23 PM
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1) unless it's a triple, the spindle wouldn't be long enough
2) 73mm frame usually means MTB and MTB style bowed chainstays which don't work with road sized rings.
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Old 12-28-11 | 02:13 AM
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Two different animals. That isn't saying you can't get the stuff in there, and with some effort not make it work, it's probably not worth the expense. OTOH I'm not sure that the 105 spindle has enough length to fit a MTD BB sucessfully. Why fiddle with it? Get the right parts.
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Old 12-29-11 | 06:01 PM
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So it turns out my bike BB width of 68mm, would a shimano 105 5700 external bracket work with a shimano 105 5600 crankset?
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Old 12-29-11 | 06:27 PM
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well what sort of frame is it?
a road bike? CX? MTB?
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Old 12-29-11 | 06:38 PM
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Cycling News says this:

the 5700 bottom bracket is compatible for use with all the Shimano Hollowtech II road cranksets.
Just gotta hope your frame likes the setup.
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Old 12-29-11 | 07:14 PM
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needs 73 mm compatle bb
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Old 12-29-11 | 10:18 PM
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i have an '87 Trek 1000 road bike.
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Old 12-29-11 | 10:24 PM
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yes, it should work.

one thing you might want to consider for that type of bottom bracket is to get the BB shell faced if it isn't already.
it's not absolutely necessary, but it does save wear and tear on the crank axle.
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Old 12-29-11 | 10:26 PM
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Originally Posted by jah5z6
i have an '87 Trek 1000 road bike.
Well, that bike should have a 68mm English threaded bottom bracket shell. I think you're saying you want to use a 5600 crankset with 5700 bearing cups (English thread). The answer is yes, it will work. You might want to take it to a bike shop and ask them to check and see if your bottom bracket shell faces need to be faced before installing the outboard bearing cups. Parallel faces of the shell are fairly critical with this type of bottom bracket bearings.
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