Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
265/65-17 6.8in 15.3in 30.6in 96.0in 660 0.0%
245/70-17 6.8in 15.3in 30.5in 95.8in 661 -0.2%
245/75-17 7.2in 15.7in 31.5in 98.9in 641 3.0%
According to the tire size calculator
, the 75s are 3% bigger.
I think the only issue will be your speedometer reading will be off. I'm not sure about rubbing.