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MountainBikeReview.com's Forum Archives - General Discussion
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Q about Bottom Bracket Installation, (7 posts)
|  Q about Bottom Bracket Installation, | PeepeePoopoo
Apr 25, 2003 1:30 PM | | I'm having a bit of a problem with installing my RF Turbines onto my SHimano UN-72 square BB. Seems that the crankarms go halfway onto the BB spindle, then stop. Am I supposed to force it on the rest of the way, or is it supposed to stop there? Thank you.
4P |
| re: Q about Bottom Bracket Installation, | MegaDumpFlusher
Apr 25, 2003 2:15 PM | | Clean and grease your square taper spindles, slide your Turbine crank arms on and torque the crank bolts to spec. Your torque spec should be somewhere in the neighborhood of 25-30 Foot Pounds.
Torquing to spec does effictively "force" the crankarms onto the BB spindle but you must force with the proper tool...a torque wrench! |
| re: Q about Bottom Bracket Installation, | PeepeePoopoo
Apr 25, 2003 2:16 PM | | Ok, thank you:)
4P |
| Don't grease BB shaft... | gorse
Apr 25, 2003 3:14 PM | | or the crank will be forced to far on the slippery taper, splaying the sides and they will loosen more quickly. Shaft and crank should be clean and dry, IMO. |
| Much debate regarding this issue.... | MegaDumpFlusher
Apr 25, 2003 6:04 PM | | ....My opinion is that when you put something together dry, especially something exposed to the elements, you're probably going to be dealing with some degree of corrosion when trying to disassemble later. As you said, with grease applied the arm will be "sucked on" or go on a bit farther.
I'd rather deal with suck-on then corrosion anyday. |
| It's not supposed to go on all the way. | truant8
Apr 25, 2003 2:16 PM | | The spindle is tapered so It's impossible to tighten it all the way. Just follow the torque specs for the BB. If you don't have a torque wrench, just tighten til it's snug. |
| re: Q about Bottom Bracket Installation, | Tom Mtn. E
Apr 25, 2003 4:16 PM | | Square or taper bottom brackets as they are known. Need to be pressed on by tightening the bolts until the crank arms are seated on the spindle. This is why you need a crank arm puller to take them off. It takes about fifty foot pounds of torque to achive a tight crank arm. If you don't do this they will come lose and damage the spindle. tom |
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