oem is 24-8-12 and 24-9-11. IMO every inch larger in height is a knock down of 5% on power and an increase in speed of the same. 2 inches wider than stock is usually maximum and any more than 2" in height needs a lift kit to not rub fenders. I run 25-10-12 on front and 25-10-11 on rear with no issues as to clearance , but to run mud in 2nd gear, I had to install a dynojet kit and hi flow air filter.