275/50/15 on a 7" wheel ?

I'd run the 8" wheel, I used to run 295-50x15's on the street. I started with a 7" wheel & the tires wore prematurely in the middle no matter what air pressure I ran. I switched to an 8" wheel & the tires wore perfectly across the tread pattern with 28-30 lbs, & lasted over twice as long. Just my .02.