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tightening cranks(4 posts)

tightening crankscameron1
Apr 3, 2002 11:51 AM
I was just wondering if cranks need to be tightened to a certain torque to the bottom bracket or if it is not that imporatant, and if a special grease needs to be used on the spindle of the bottom bracket.
the easy answer is... it depends!floatch
Apr 3, 2002 1:23 PM
I don't know about the new-ish splined crank systems (shimano and truvativ style), but many manufacturers recommend a light coat of grease on the square spindle before crank installation. Then again, some manufacturers recommend dry spindles. Every crank and bottom bracket I've ever installed had a torque rating to use with a torque wrench when installing. As far as special grease, I'd avoid white grease, as it turns into nasty powdery stuff after some time. Personally, I use Phil Wood grease for just about everything that needs to be greased on my bikes. It's just about the best out there. If I were you, I'd check the manufacturer's page and see what their recommendation is. I've always used a light coat of grease on my spindles before crank installation, because I've gotten the squeaks every time I've installed dry cranks. Good luck!
re: tightening cranksTJeanloz
Apr 3, 2002 1:31 PM
Yes, there is a specific torque, and it is important: 50 Nm for splined Shimano, 38 Nm for square taper.

No grease on square tapers, very light grease on splined.
YupSpoke Wrench
Apr 4, 2002 6:38 AM
Cranks and stems are two things that I recommend using a torque wrench on. I think that most people undertorque crank arms and I think that most people overtorque stem bolts.