Constantly loose cranks

guymuttley21 · Feb 10, 2013

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

gibbleking · Feb 10, 2013

new cranks me old china

Tc · Feb 10, 2013

gibbleking":170vvmil said:
new cranks me old china

X2

T

gerryattrick · Feb 10, 2013

X3

Hard steel axle vs alloy cranks. Steel always wins.

feetabix · Feb 10, 2013

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.....

integerspin · Feb 11, 2013

You could blue the taper and see what the fit together like.

T'boo Ted · Feb 11, 2013

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.

minor_LEGEND · Feb 11, 2013

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.

oldave · Feb 12, 2013

Shim 'em.

bontyfiend · Feb 13, 2013

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...

Constantly loose cranks

guymuttley21

gibbleking

Old School Grand Master

Tc

gerryattrick

feetabix

integerspin

Senior Retro Guru

T'boo Ted

minor_LEGEND

Senior Retro Guru

oldave

bontyfiend

Retro Guru

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