Back Wheel Moving

[Kyle G]

Hey,

Well after getting my first bike about 3 weeks ago its been fun learning but im having some trouble with my back wheel, This week I managed to do one hop on the back wheel and it pushed the back wheel forwards making the chain come loose I tightened it all up put it back in place but it jsut keeps slipping not matter how tight I do it, I dont know alot about bikes yet so was wondering if any one would know what to do or have any suggestion?

Also would Filing the wheel have the same effect as grinding? wet weather makes it hard to learn.

Thanks

kyle.

Edit: Bike is Yaabaa 449 if any help.

Edited September 5, 2008 by Kyle G

[Aaron.Tottman]

take it your got horezontal dropouts?

chain tentioner.

to stop it from moving with out one i jamed a bolt between the axle in the c'stay so the wheel wont move forward

but that was on a cheap BMX wouldn't recomend it unless you desperate.

[Kyle G]

Nah not that desperate, It normally does it slowly but eventually ends up moving to far and the chain comes to loose to do any thing, A friend said that he thinks its the nuts on the end of the tensioners there just normal metal nuts he thought they would of been ones with a plastic bit inside them? some thing about it stops the nut from moving by itself.

[DrDoom]

http://jforjustice.co.uk/banksters

[Walleee]

yeh if it had a bit of plastic it would be considered a lock nut and shouldn't come loose, I wouldn't have thought that it would matter but give it a go it could be a cheap fix.

[psycholist]

I'd be very surprised if the issue is that the nut is coming loose as you cycle and then the wheel is moving... It's far more likely that the nut just isn't generating enough clamping force to begin with. Not an easy one to sort out without possibly changing to different nuts (Or tightening the ones you have more - they'll probably strip though). Get some snail cams or chain tugs to take the chain tension load rather than relying on friction between the nuts and the frame to do the job.

[Sponge]

Frustrating problem on a mod. My pet hate about horizontal dropouts!

It's usually easily fixable. Some axles/nuts/bolts types will have different clamping forces to others, standard hollow axle bolts aren't very strong at gripping, whereas big beefy ones like Profile and King grip very well. Even so, there is nothing better to solving it than having some sort of tensioner on there like chaintugs or snail cams. Since these act as a barrier against the wheel moving forward totally.

[Kieran24]

I'd be very surprised if the issue is that the nut is coming loose as you cycle and then the wheel is moving... It's far more likely that the nut just isn't generating enough clamping force to begin with. Not an easy one to sort out without possibly changing to different nuts (Or tightening the ones you have more - they'll probably strip though). Get some snail cams or chain tugs to take the chain tension load rather than relying on friction between the nuts and the frame to do the job.

I think he's on about the bolts on the end of the chain tensioners not being lock nuts (never actually seen any that are) so the are coming loose and not stopping the axle from sliding forward in the frame.

A solution to this would be to get new nuts as the thread may just be knackered in the old ones, or even to give lock nuts ago, shouldn't cost much at all from a hardware store. If that doesn't work then new tensioners can be had for around a tenner or so. Failing all that you could turn to snail cams, but having never used them I understand that they are frame dependent as a bolt must be screwed into the dropout.