Originally Posted by murrayflagstaff
Is there enough room to change from 205/75R15 to 225/75R15 tires. Our gross weight is 8100 lbs, thnking that load range D would be be better than load range C.
the math says if you gain a diameter of 15mm.
the 205 is 205 mm wide and the 225 is uh 225 mm wide
but the overall diameter of the tire would increase by 15 mm, ( 75% of 225 = 168 mm and 75% of 205 =153.?? which leaves us at 15 mm or .59 of an inch of diameter difference, now if you change wheel size say up to a 16" wheel then its going to be a greater size difference.
if your tires are like ours i cannot get my palm between the two tires when they are warmed up.
or the 205 tire you have should have a diameter of roughly 27.04 "
versus the new tire diameter of 28.2"
hope it helps