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Do BMX crank arms fit on sealed bearing BB?

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Do BMX crank arms fit on sealed bearing BB?

Old 09-17-18, 01:01 AM
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AtNjineer
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Do BMX crank arms fit on sealed bearing BB?

my Electra super delux has a sealed bearing. The chainring is pressed on the crank arm. I want to change the chainring gear size. Will a bmw crank arm set fit my bottom bracket?
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Old 09-17-18, 06:25 AM
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rhenning
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Maybe. Is it a square taper bottom bracket? Is it a square taper crankarm? Is the new crankarm the same length as the old one? If all of these are the same then yes. If any are different then no. Roger
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Old 09-17-18, 11:18 AM
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Yes I think mentioned they’re both square tapered the Bb and crank arms. You didn’t ask me if I knew what size square tapering they had. My real concern was if the bmx crank arms have a larger square tapered hole than the originals and would sit loose on the bb even when tightened down. Should I worry about that? The bmx arms I want to use are 140mm. The originals arm idk 165mm maybe I’m losing length but I feel like I’m getting the torque I lost back with a 34 tooth chainring.

Last edited by AtNjineer; 09-17-18 at 11:21 AM.
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Old 09-17-18, 06:01 PM
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rhenning
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I do not see you mention square taper any place in your first post. Go up and you can see for yourself. If the crank will not tighten up do not use it period. Short crank arms will loose a lot of your leg power and 2 different lengths will never work right. No more answers from me as you apparently know everything already. Roger
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Old 09-18-18, 12:30 AM
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Lol I did see in fact that I don’t not mention it. I did not take the opportunity to edit my reply afterwards sorry I didn’t know we were playing with sticks and stones. You can use two different lengths sometimes people have two different length of legs. As for loss of power I’ll let you know like I said I’m gearing down.

Last edited by AtNjineer; 09-18-18 at 12:34 AM.
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