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 Post subject: Constantly loose cranks
PostPosted: Sun Feb 10, 2013 10:17 am 
Gold Trader
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Joined: Tue Mar 15, 2011 9:02 am
Posts: 832
Location: surrey,uk
Run some xt m730 cranks on my Klein attitude

They constantly come loose- side to side play

New cranks or bottom bracket axle?

Thanks chaps


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PostPosted: Sun Feb 10, 2013 10:33 am 
Special Retro Guru
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Joined: Sun Apr 29, 2007 6:22 pm
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Location: busy forgetting how to edge flip on a 11x11 monster cube///...
new cranks me old china


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PostPosted: Sun Feb 10, 2013 11:47 am 
retrobike rider / Gold Trader
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Joined: Thu Apr 28, 2011 5:31 pm
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Location: WILTSHIRE
gibbleking wrote:
new cranks me old china


X2

T


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PostPosted: Sun Feb 10, 2013 12:03 pm 
retrobike rider
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Joined: Thu Jan 21, 2010 11:13 am
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Location: I don't know, the satnav's bust!
X3

Hard steel axle vs alloy cranks. Steel always wins.


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PostPosted: Sun Feb 10, 2013 12:50 pm 
retrobike rider
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Joined: Tue Mar 17, 2009 3:55 pm
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Location: In trubble'fsumthin r'uther....North Warwickshire
another consideration is the torque settings for the bolts, they should be way tighter than you may initially think.......i had the same issue on a bike until i did them up to proper torque spec and havent had a problem since..... :D


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PostPosted: Mon Feb 11, 2013 4:23 am 
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Location: Near Gatwick
You could blue the taper and see what the fit together like.


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PostPosted: Mon Feb 11, 2013 7:55 am 
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Joined: Tue Jun 19, 2007 3:34 pm
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Location: Launceston, Australia
i had a problem of a loosening bolt on my drive side crank arm, didn't matter what I did, came loose. LBS said stick a spring washer on it, so we did right there, never came loose again.


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PostPosted: Mon Feb 11, 2013 6:57 pm 
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Joined: Fri Jun 12, 2009 11:58 pm
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Location: Quantocks
If the cranks have lossened on the axle whilst being ridden, its likely the square taper in the crank has worn out of shape & will never stay tight again.


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PostPosted: Tue Feb 12, 2013 4:43 pm 
Gold Trader
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Joined: Wed Feb 04, 2009 9:40 pm
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Location: Nottingham
Shim 'em.


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PostPosted: Wed Feb 13, 2013 2:12 pm 
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Joined: Fri Jul 13, 2007 1:00 pm
Posts: 334
Location: Oxon
I've used thread-lock (Loc-tite) successfully a few times (liberally applied to the taper and a bit on the bolt).

In one case I used some Araldite on the taper - might need to bash the crank to get it off again, but if the alternative is binning it anyway...


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