How much bigger is as 235 75 15 tire than a 215 70 15?

To compare the sizes of the two tires, we need to look at their overall diameters. The 235/75R15 tire has a diameter of approximately 28.9 inches, while the 215/70R15 tire has a diameter of about 27.4 inches. This means the 235/75R15 tire is roughly 1.5 inches larger in diameter than the 215/70R15 tire. Additionally, the wider tire (235 vs. 215) will also have a greater contact patch on the road.