cup and cone rear axel undoing itself

theadam4

Hi,

My road bike is old, very old ... 30+ years old ! and has been happily sitting doing nothing for most of its life. Last year I started to use it for my commute and all was fine until last when for some reason the rear cone on the non drive side has started to unwind ! within a couple of miles it goes from no lateral play to the wheel wobbling about 3 inches! a bit disconcerting to say the least!

I tighten it up but it just happens again.

I've replaced the axle (and cones and lock nuts) but it still occurs!

Am I right in thinking that the only method to stop this occurring is to tighten the cone against the lock nut or have I missed something?

thanks in advance!

drlodge

There should be a lock nut adjacent to the cone, the two need to be tightened against each other...to stop the cone moving once in the right position. If you don't have a lock but, that'll be the reason for your troubles.

Spectre

Have you got a cone wrench? (Basically a thin spanner). As said above, you need to tighten the cone against the locking nut. If that's done properly then its not going to move.