I have toyo T1-S tyres on my car, which have a tread pattern where the grooves run more or less round the tyre. Each of the tread blocks on the rears has worn more on the outside edge than the inside. Not only are the blocks lower on the outside, but the outside edge is worn round but the inside edge is quite sharp. What causes this type of wear pattern?

Going round corners fast.

Sounds like you need a bit of negative camber on the rear (or take away the positive camber). Does a picture show the wear pattern up??

Not enough drifting. Try more wheelspin. Should even up the wear!

Mike

wouldn't underinflated tyres do that too?

Too much toe in will cause tyres to wear on the outside edges, Too much toe out will cause wear on the inner edge. Over inflation will cause the tyre to wear in the middle , under inflation will cause both edges to wear. As already said hard cornering will cause the outer edges to wear as will to much positive camber.

I'm pretty sure that there's the correct amount of negative camber and I do go round corners pretty hard, especially on the track.

What would the handling effect of too much rear toe in be?

Sounds like too much positive/not enough neg camber. The rounded description points to that as well.
It could be too much toe-in but you'd get a shark tooth effect to the tread block edges if it was that. Can you feel steps if you run your hand over the worn tread.

adrian

quote:

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Originally posted by blakep82
wouldn't underinflated tyres do that too?

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Ultimately what it means is your wasting your money, get the camber looked at while you still have tread to play with.

I think you've got some rear toe-in.

It's quite normal to design in a bit of rear toe-in for additional straight line stability and grip. I'd ring MNR and have a chat - it may be normal on their cars and he may be able to help adjust it out if you don't want it.

More wear is normal on the outside shoulder -- however from you description it sounds like things could be improved.

(1) check the toe-in
(2) more negative or change the rear geometry