I have been doing a 4 tire rotation (my bad....should have done all 5) for 26,000 mile and now one of my tires is cupped. Can I use my spare with it still being new? should I get one new tire and junk the cupped one and run the new and spare on the same axle?
Couple of questions.
What brand of tire?
I have NITTO Trail Grapplers. Before the TG's I had Mickey Thompson Baja ATZ's and they were cupping bad. Dropped the PSI down to 28 all the way around and they smoothed out.
What tire pressure are you running?
I run 29 PSI in the front tires and 28 PSI in the rear tires.
Have you done a chalk test?
Use side walk chalk and put across the width of the tire. Drive in a straight line for about 300 feet and check the wear. reduce the PSI some and repeat. Continue unitl the chalk is off the tire.
R/
Will