uneven and serrated rear tyre wear

[veclee]

for the first time since i got the vec ive had a chance to get to check some stuff in day light after jacking threar end up to investigate knocking noise if noticed the uneven tyre wear on both rears but its also wearing them like a serrated edge too if ya get me not sure why and i cant find the knocking when its jacked up only when the wheels are on the floor is the knocking heard any ideas people

[stevie16v]

Sounds like the rear shocks are knackered

[Dan_BlackSRi]

With the car on the floor, if you grab the tops of the rear wheels and pull, do you feel some movement?

[John LE]

Sounds like the rear shocks are knackered

sounds like "saw toothing" caused by a worn shock

Also as Dan says I'd check the UCAs too as they won't be helping the problem

[veclee]

yes thats the knocking when i pull the top of the wheel it dont knock when driving along i have a humming noise like a bearing so i gave them both a tug and felt the knock and jacked it up to look no leaks/oil from the shocks visable and cant really see any obviose worn bushes the bearings are ok (but found a siezed rear caliper fixed it no difference)so ive put it down to cheap tyre droning like a few post have said and the ride seams fine no noticable swayying or twitching ive only had it 3 weeks so my first real chance to look at it in the day with work and a a spinal op 2 days after i got it so making the most while i can over the weekend

[Dan_BlackSRi]

Sounds like the upper control arms then, they do cause the tyre(s) to wear uneven, almost bobbly which will cause a droning noise.

[veclee]

ah right ok thank you for the info. i could not spot essive wear in the bushes but on 2T jack with a bad back dont help much lol my as well get em changed then cant do any harm the rears do look to be leaning in at the top abit so hopefully get these done and its cured with a bit of luck

[Big Dave]

jacked it up to look no leaks/oil from the shocks visable

My LH side rear shock had no signs of leaks or oil either. However when I took it off there was approx 3" of travel before it did anything when I compressed it. The RH one was fine. I compressed both together at the same time, side by side and allowed them to rise back up of their own accord. The LH one jumped back up when it got to approx 3" from the top, the RH one rose steadily all the way throughout its travel.

Best thing to do is undo the bottom nut and see how easy the shock will compress by hand and then make sure it dampens throughout all its travelling distance when you let go.