What is your width on the 28-10's?Thats the tire I have and love them.
Evos 28-10-12 on STI HD 12x7 5+2
I'm running them at 10 psi - no rubbing. When I installed them I pumped them up to 20 to get any stretching out of the way and they rubbed - so this is about max size to fit without lift.
I like the ride but its true about having fewer choices in the 12 inch - If I ever want to changes things. Big IF...
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Also, do you have a straight on pic of the front tires mounted on your P1K?