Cooper S/T's Scalloping edges GU III - Any Idea's?

My initial thought (before I got to the 2nd paragraph) was that your tyre pressures might be a bit low.......BUT 42 PSI is probably too high for a stock-weight GU. I run that pressure all round in my GU; but it is rather a lot heavier than a stock truck.

So sorry, I can't suggest anything really. I'd be taking them back to the tyre dealer and getting his thoughts.

I did have a set of Cooper STs and found they were wearing on the outsides too, as well as chipping badly. I solved the problem by buying Goodyear MT/Rs. Coopers will not be getting any more of my money for STs....but I may be tempted with their STTs when I change over next time.

Cheers

Roachie

Peter,
I think that the tyre pressure is too high for a vehicle that is running empty, even full it would be too high.

This will always get a lot of post regarding tyre pressure, but if you have a problem now, and ever thing else is OK it has to be tyre pressure. The fact that there is scalloping on both sides of the tyre rules out wheel alignment and hard cornering.

Try running 36psi and see if that makes a difference.

Wayne

BFG's next time? ;-)

Apparently quite common on GU's according to the patrol forum, or should I say, has been discussed a fair few times in the past.

Also I agree with the too much pressure even though you are getting gods figure of 4psi, even though that is just a generic figure someone pulled out of their arse years ago.

Try letting pressure out, and see how you go.

YMMV

P.G. I have the same set-up I think (Kings HD progressive 50mm raised and Koni's). You need to wind the Koni's on at least one 1/2 turn at the front, 3/4 or 1 turn would not so any harm if you have linear springs) and at least one full turn at the rear. I've been through the exact same issue but with BFG's. This is definitely a "shock too soft issue". It could be somewhat exacerbated by your tyre pressures which seem a little on the high side to me. FWIW I have a good number of years of success in M/sport and have a good feel in the ass end for shock settings and this is what I came up with.

Hi PG,

I have ST's that have now done 56,000kms and are wearing flat. I run 34 psi but up that to 40 psi when loaded (campervan + gear). I rotate them every 5,000km, except when I got slack once and went 12,000km and then the fronts did scallop. But after rotating and another 10,000km on them, they are basiclly flat again. Even with this mileage I still have 10mm tread all round.

As others have said, try dropping your pressures. i have run 40 psi and find it too firm for daily driving. Am very happy all round with the ST's.

Cheers

Captain