Kahuna Well-known member Mar 20, 2016 #21 My figuring shows only about a 100 rpm difference using a 7.10 X 15 tire vs the 6.70 X 15. At 70 mph, rpm will be about 3050 with the larger tire. Flatheads run a long time at the rpm. Just my observation Jim
My figuring shows only about a 100 rpm difference using a 7.10 X 15 tire vs the 6.70 X 15. At 70 mph, rpm will be about 3050 with the larger tire. Flatheads run a long time at the rpm. Just my observation Jim
