Hey guys and gals,

I just had some Yokohama S-Drives put on about 500 miles ago and my drivers side rear tire is cupping on the outer edge. I am not sure why? I had an allignment done after the install and all is within factory spec. Here is what it is set at for the tire in question, and the allignment was done on a Hunter 3000 allignment rack.

Drivers Side, Rear Tire:

Camber -1.0
Toe .01

Tire PSI is set at: 30 for this tire. Any Ideas Folks?

 

Lack of rotation top reason for cupping on directional tires.

 

Neal, thanks for the reply, but there are only 500 miles on the tires. And the allignment is good. Can it be a bad tire? or what?

 

I would rotate anyways... If it happens to that corner again, maybe its the strut...? If it doesn't clean up and gets worse on that particular tire, maybe it is defective...?

 

I agree with grillpt. Rotate. See that side in 500 miles. If its back -- strut or alignment is off.

 

strut is bad. if you rotate, you'll get the same cupping on that side with the newly rotate rotated tire.

 

You have a strut/coilover issue if your alignment is good

 

what I don't understand is when I had my 255's on there was no cupping, now with the OEM size there is? I cant see it being a blown strut. Its the OEM Bilsteins, and I mean, there is no oil seepage, driving over bumps its solid as always, push on the trunk its firm, no slop. If it were blown, wouldn't I know it? I guess I look into getting the strut rebuilt through Bilstein, it would be free through them anyway. Just pay for shipping.

I had the allignment done at a place with a good allignment rack. Same guy did it as always, I was RIGHT THERE and saw him work on the car, and saw the computer as he was alligning it. I even double checked the toe with measuring tapes, (old school) and was dead on. So the Toe is good. Wouldn't be camber because its wearing on the outside of the tire. I did have an issue when I had my Robi Spec rear sway bar installed at a shop. I didn't know I did until I put on my Perrin end links. I will post the pics of that, and see. Maybe one of the suspension links is bent? When I found out what they did to my sway bar I GOT BENT!!! Im still up in the air on what is going to happen about that. But can the arm maybe be bent from where the sway bar hit it? When I had the 255's I was running -1.5 camber in the rear. Now -1.0 Maybe the xtra camber hid the problem of the bend piece??

 

Could be a tire issue. Have you fixed the bent part?

If its fixed. Rotated tires. And it comes back. I'd to to Yoko and file a claim.

 

my guess if they did your alignment, did they shake down the front end to make sure its tight....cupping can happen for a few reasons...either lack of rotation, worn suspension/steering part....OR when they put the vehicle on the alignment rack it didnt go on straight... if it dont go on straight the vehicle can seem like its in spec on the computer but wont be, this happened to me at a previous shop i worked at. so double check the front end to make sure its tight, and if so go back to the shop and have them recheck it...one other thing i would look at is checking the date of when the tire was made...to look for that look on the sidewall of the tires for the DOT number: last 4 numbers of it tells week and year of manufactured...
good luck

 

It's a alignment issue I had the same problem, I took it to a suspension specialist and now its smooth. call Westend alignment

 

Thanks Everyone for your input. Its the rear tire not the front, so I doubt that anything is lose. The Hunter Rack that the car was on, has the car roll onto roller type things like a dyno to ensure the car is straight, so I dont think its that.

For the moment I can't do nothing till pay day in 2 weeks. I may try taking it back to the allignment place again, to verify, but I was right with my car and the guy who did the work. So there was no hurry up job. Took a couple of hours. He always does on my car is why I keep taking it back to this place, and the fact that they have one of the best allignment racks where I live.

I also checked the toe myself with measuring tapes (old school way) and it was dead on. So its really puzzling me. If the toe is dead on then WTF? haha. I may also take it to my friend who tunes my car, he will check it out for me as well and give me his verdict.

Will keep you all posted on this mystery.