Cupping on oversized tires - Ford Powerstroke Diesel Forum
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Old 08-07-2007, 02:36 PM
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Cupping on oversized tires

Hey guys,

The new (new to me) '02 F-350 Dually has 315/75/R16 tires and the front wheels have the worst case of cupping that I've ever seen. I am getting it realigned right now but the shop is telling me that I will have the same problem with future tires due to running the oversized tires.

Anybody hear the same thing from others or is this guy just trying to talk me into the tires he has in stock?
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Old 08-07-2007, 03:51 PM
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They could but before you condemn the tires i would check the whole front end out bad shock absorbers can cause excessive cupping too. Are the rears cupped, and is it DRW?
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Old 08-08-2007, 04:39 AM
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couple of questions,do you keep the tires rotated,what tire are you runnin M/T or A/T,what is the air psi you run in them?remeber the truck wears the tires so i'm guessing you have a problem in the truck or lack of rotation..
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Old 08-08-2007, 06:54 AM
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I don't know how or if they were ever rotated, I know that the next set will be, because I'm fanatic about that (at $200 a tire you have to be...).

We did find a loose tie rod that was causing some of the vibration that I felt so I'm hopeful that will prove out to be the cause of the cupping. The truck only has 69,000 miles and only 40,000 of those are on the current lift kit/shocks.

It is dual rear wheels (my first dually actually) and the rear wheels seem to be fairly even in their wear pattern. I'm actually considering going with a smaller width tire on the front and leaving the rear alone until they are showing enough wear to justify replacing them.

By the way, what is the rotation pattern for DRW trucks?
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Old 08-08-2007, 08:09 AM
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i would take the fronts and crisscross them to the inside duals and take the inside duals and put them on the outside and move the outsides straight to the front..not saying this is the only way to do it just the way we always did and so far it seems to be the best for us..
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