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PostPosted: Fri Feb 22, 2013 1:55 pm 
retrobike rider
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Joined: Thu Apr 28, 2011 11:36 am
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Was about to fit some new square taper cranks which I have done a few times in the distant past, when I thought do I grease the tapers or not? A quick google search opened a huge can of worms and I am now none the wiser, opinions seem split 50/50 on the subject, anybody any advice???


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PostPosted: Fri Feb 22, 2013 1:58 pm 
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Location: Somerset
You wouldn't grease a morse (circular) taper on a machine tool.


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PostPosted: Fri Feb 22, 2013 2:07 pm 
retrobike rider
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nope, grease would encourage movement as you are introducing something into a tolerance


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PostPosted: Fri Feb 22, 2013 2:10 pm 
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I've always put a smear of grease, or coppa slip on mine and haven't had any problems, but as you say, it seems impossible to find a definitive answer.


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PostPosted: Fri Feb 22, 2013 2:13 pm 
MacRetro rider
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I also put a smear on them. But no more than that. And I think it may be more psychological than practical.


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PostPosted: Fri Feb 22, 2013 2:15 pm 
retrobike rider
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I think because the camp is so divided it proves it doesn't make any difference if you do or not, cleanliness may be more important that lubrication


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PostPosted: Fri Feb 22, 2013 2:19 pm 
retrobike rider / Gold Trader
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Location: Getting fitter, I will beat the Surrey Hills....
Nowt wrong with a small spot of copper slip, but I don't think it is essential. Put a tiny touch of thread lock in the crank bolts and I would bet money you wouldnt have a loose crank. My two pence.


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PostPosted: Fri Feb 22, 2013 2:24 pm 
retrobike rider
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agree with just a smear of any lube, even a tiny squirt of WD40. you see, it's more about helping the taper push up tight and bed-in quick. in the same way you may lubricate a spoke thread prior to building a wheel, helps get the nipple tension correct.


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PostPosted: Fri Feb 22, 2013 2:25 pm 
Old School Hero

Joined: Sat Nov 26, 2011 10:40 am
Posts: 160
Location: Cheshire
No grease, keep it dry, as it is an interference fit. Adding lubrication allows the crank to be pushed on too far damaging the crank tapers, then it is easier for the crank to work loose and become un-usable. Though a quick fix for damaged crank tapers is to hammer the back of the crank pushing material back into the hole, then a liberal amount to permanent threadlock and tighten on as hard as you can but not too hard and with a little luck that will give you a few more years cycling.


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PostPosted: Fri Feb 22, 2013 3:03 pm 
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Joined: Sun Jul 19, 2009 7:14 pm
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I was always told a very slight but of grease just to stop metal to metal binding, almost enough to make it look shiny .

Cheers

Anthony


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