cupping tires.. those running 285s

[tomdietrying]

I'm running 285/60/18 Nittos. I run my tires between 35 - 38 lbs. I have about 45 k on them, and wearing pretty even. I try to rotate mine every
5-7 k.
Peace.
Tom

[WormGod]

Are you factory ride height? Alignments on lifts/lowers are a funny thing and I know to preserve your CVs you have to make a slight adjustment.

I ran super soft Yokohama AVSs on the factory rim for about a year sometime back and had no issues with inner wear. Probably had about 15k miles on them.

I did have the same issue on my WRX when I lowered it. Alignment would not help, even a performance alignment. It was concluded that the problem was the wheel offset, which was the same as stock (same size wheel/tire, just aftermarket). Going from a 52+ to a 44+ solved it.

Very strange....

[tom4bren]

I'd always heard that cupping was caused by bad shocks.

As far as offset is concerned ... mine have never shown any cupping but with MTs, it may be hard to tell. My fronts are VERY worn (but evenly) while the backs are still good - rekin I shoulda rotated more often but by the time I noticed it, it was too late.

[Ldub]

I'd always heard that cupping was caused by bad shocks.

As far as offset is concerned ... mine have never shown any cupping but with MTs, it may be hard to tell. My fronts are VERY worn (but evenly) while the backs are still good - rekin I shoulda rotated more often but by the time I noticed it, it was too late.

...you should always have your best tires on the steering axle, so blowouts, however unlikely, are more apt to happen on the rear axle.

[etlsport]

nah im still factory height factory wheels
i think im gonna re-align it including shims for the caster/camber adjustments and see if that helps.. the shocks are new within the last 5k, so i dont think thats it

[VX KAT]

know this isn't much help, but thought I'd mention it......I had these same tires in 255/55-18, at 36 psi on OEM rims, for about 7k - 8k miles, (based on look of tread...they came with car....I only had them for about 2,500 miles) no cupping or any problems, even wear. good enough that tire place bought them from me to resell.

[tom4bren]

...you should always have your best tires on the steering axle, so blowouts, however unlikely, are more apt to happen on the rear axle.

True ... but ... for the sake of the TOD, I left 'em up front.

[circmand]

...you should always have your best tires on the steering axle, so blowouts, however unlikely, are more apt to happen on the rear axle.

Why have the best (Isuppose you mean deepest tread) on steering axle ie front when manual calls for taller tires to be on the back refer to manual mini spare goes on front even if flat is in back you should put mini on front and move full size to back.

[Ldub]

True ... but ... for the sake of the TOD, I left 'em up front.

Why have the best (Isuppose you mean deepest tread) on steering axle ie front when manual calls for taller tires to be on the back refer to manual mini spare goes on front even if flat is in back you should put mini on front and move full size to back.

Good points both, I guess I hadn't thought it through that far...

[rowhard]

I'd always heard that cupping was caused by bad shocks.

As far as offset is concerned ... mine have never shown any cupping but with MTs, it may be hard to tell. My fronts are VERY worn (but evenly) while the backs are still good - rekin I shoulda rotated more often but by the time I noticed it, it was too late.

Insert 2cents:
Yes, usually a indication of the tire bouncing, plus with the under pressure would increase the problem.