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Once and for all: Grease the spindle or no?(9 posts)

Once and for all: Grease the spindle or no?cory
Jul 5, 2002 9:07 PM
I don't grease the BB spindle before installing the crank. That's how I learned it 25 years ago; it's always worked; no problems. But lately I've read a couple of pretty convincing arguments about why you SHOULD grease it. Anybody got any strong feelings one way or the other (I'm talking standard taper, Shimano kinda BB)?
Thanks
re: Once and for all: Grease the spindle or no?rwbadley
Jul 5, 2002 9:44 PM
I have heard for/against this way:

The reason to grease is to prevent problems in removal of crank at later time due to corrosion at joining surfaces of two disimilar metals.

The reason not to grease is to avoid damage to crank tapers. Greasing will allow the 300 inch pounds torque applied to the crankarm bolt to possibly cause the spindle to deform the crankarm taper. I guess because the too slippery grease allows the crank to travel too far onto the taper.

I have greased in the past, and have not seen a problem yet.

I guess a good compromise would be to grease just two sides of the tapers, or one side of the spindle. Or maybe grease, then throw sand on it so it's not so slippery. ;-)

Anyone else?

RW
re: Once and for all: Grease the spindle or no?Walter
Jul 6, 2002 3:02 AM
I've been working on bikes for a long time too and I never greased. The dissimilar metal argument does have some validity and I routunely grease anything else, like seatposts, where there's 2 different metals.

OTOH I've never had a bit of trouble with either a BB spindle or a crank not releasing when the right tool is used. Seatposts tend to be "set and forget" wheras cranks are broken down regularly so maybe the corrosion just never has a chance to form.

Again OTOH (it's nice to have 3 hands :-) ) I've taken apart BBs for friend's bikes that have sat for years w/o trouble. This is all a long way of saying "beats me" though I can't see where not greasing is particularly harmful.
re: Once and for all: Grease the spindle or no?4bykn
Jul 6, 2002 5:20 AM
I've seen a friend who greased his actually crack/split his crankarm at the corners of the holes. And I've never had trouble removing mine, even though I don't grease.
Absolutely not.High Gear
Jul 6, 2002 7:32 AM
By greasing the tapered spindle you will cause the aluminum crank arm to ride up the steel spindle making it stretch in the long run,damaging the arm. Campy / Shimano cranks and BB shouldn't be used with one an other due to differences in the tapers also.
splined BB ?DERICK
Jul 6, 2002 9:03 AM
How about greasing a splined BB? Is that ok?
yes4bykn
Jul 6, 2002 11:41 AM
In fact, I think Shimano recommends it.
nopexcandrew
Jul 7, 2002 12:48 AM
It only rides up if you retighten the crank bolt after you initially install the crank properly. See the rec.bicycles.tech FAQ for a good explanation:
here's the linkxcandrew
Jul 7, 2002 12:52 AM
http://draco.acs.uci.edu/rbfaq/FAQ/8f.11.html