when I bought my truck in January in had new rubber on it, between the headgasket and me being out of the country I have only put about 5-6k on it.
This morning when filling up I noticed that the right rear tire is scalloping/cupping on both the inner and outer edge.

I should note that as the roads dried up from winter snow and rain I begain to notice a viberation at highway speed, which was getting worse. Coming up from the seat, which is one of the reason I was looking at the rear tires or rotoflex to begin with.

I jacked the truck up after getting to work just to make sure nothing was loose, everything is tight I don't feel any play, the tire appears to spin true.

I'm sure this is the cause of my viberation but I dont want to throw a $200 spare on the their if I have a deeper more server problem.

Any idea what would make the tire scollop or cup on both the inner and outer edges. all the other tire still look brand new.

 

The only situation I'm aware of that wears the inside and outside at the same rate is low tire pressure.

 

And a tires suspension,, mainly shocks.
What sort of air pressure are you running, should be 40 pounds front and rear.

 

Daryl,

I though of that, but i would expect to see even tire wear on the edges not scalloping/cupping. If it were on the front I would be checking tie rods or a ball joint.

 

mike,

40psi front and rear, my door tag reads 28psi in the front and 46psi in the rear

 

The tires last longer and there is less wear on the drive train when running even tire pressure instead of the manufactures numbers which are comfort only.

 

Mike.

Thanks

 

Also, the sticker on the door is for max load. If you look in the owners manual, you will see a much lower pressure for the rear tires, which is closer to what goes in the front.

I've seen tires that were out of balance cause cupping like what you describe. Cross rotating helps this cupping a little.... assuming your tires aren't directional.

 

Jafir,

I will check that out but for some reason I think the 18's are directional