Torque For Shimano BB-UN55 Bottom Bracket?
12-26-12, 05:55 PM
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Torque For Shimano BB-UN55 Bottom Bracket?
Replacing the spindle on my 80s UNIVEGA with a Shimano BB-UN55 cartridge - All going well but the instruction, yes occasionally I do read them, calls for 50-70 Nm (435-608 in/lbs) torque - This seems kind of much for that little non drive side aluminum collar - Am I missing something...
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12-27-12, 02:33 AM
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Nope, all the Shimano cartridge BB have the same torque values; plastic or alloy,fixed side or lock ring/collar.
12-27-12, 08:20 AM
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Since there are really no forces playing with the NDS cup, I just make 'em good and snug. Now the drive side gets spec, as that's where it needs it. YMMV.
12-27-12, 08:30 AM
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French and Italian threaded fixed cups have a way of unscrewing themselves while you ride. English threading doesn't have that problem. So... whatever the recommended torque, if your fixed cup goes in with a right-handed thread, make sure it's good and tight.
12-27-12, 08:40 AM
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I always tighten cartridge BBs until I think it seems the prongs on the tool are ready to break off. I also put anti-seize or high quality grease on the threads before I thread them on.
12-27-12, 08:47 AM
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I just tighten the thing how I see fit paying no mind to the torque specs.
Hrmm? This is the tool I use for Shimano cartridge BBs.
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12-27-12, 08:52 AM
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12-27-12, 08:54 AM
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I figured you were referring to a pin spanner and had not yet had your coffee.
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12-27-12, 08:59 AM
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(The OP's ? was about the NDS cup)
12-27-12, 09:17 AM
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Thanks guys - On goes the cartridge and I'll add that torque spec to my list of common bicycle torques...
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