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Remember that you divide the total tire height in 1/2 as the wheel mounts to the center of the wheel. 1" taller tire means 1/2" increase in ride height or 1/2" more fender fill. 235/70-15 is almost 1" shorter that a 235/75-15. Tire sizing translation. 235 mm. section width. The widest part of the tires sidewall width, not a tread measurement. 235 "/75" means 75% aspect ratio. Height to the width. 75 % as tall as the width . a 70 series would be 70% as tall. So 5 % shorter. 15" = rim diameter. Simple math.