TireSize and Comparison Calculator calculate tire diameter from code and compare speedometer differences for tire sizes. The first number 185 is the tire width in millimeters. The 2nd number 65 is used to calculate the sidewall height or "aspect ratio", by percentage. So, the sidewall height of a 185/65 R 15 tire is 60% of 185 = 192.
18570-R15 tires are 1.24 inches (31.5 mm) larger in diameter than 175/65-R15 tires and the speedometer difference is 4.9%.
19560R15 tire size comparison with Size calculator. Use our tire calculator to compare tire sizes based on tire diameter, radius, sidewall height, circumference, revs per mile and speedometer difference. 17560 R15 81 H Information sheet / Label (PDF) 185/60 R15 88 H (PDF) 185/65 R15 88 T Information sheet / Label (PDF) 185/65 R15 92 V XL Information sheet / Label (PDF) 195/65 R15 91 H Information sheet / Label (PDF) 195/65 R15 95 V XL Information sheet / Label (PDF) 195/55 R16 91 V XL Information sheet / Label (PDF) 205/55 R16 91 H vs185/65-15. 175/65-R15 tires are 1.44 inches (36.5 mm) smaller in diameter than 165/80-R15 tires and the speedometer difference is 5.7%.
Whatis the difference between 185 and 175 tire? The 185 would have a diameter of 24.65 inches while the 175 would have a diameter of 24.02 inches. The section width, or thickness of the tires differs is slightly more noticeable. The 185 would be 7.28 inches wide while the 175 is 6.89 inches wide. Does the middle number in tire size matter?

5625 6536. Better Fuel Economy Factory Ratios Increased Power. vs 185/55-15 vs 195/50-15 vs 195/55-15. 175/65-R15 tires are 1.38 inches (35 mm) larger in diameter than 175/55-R15 tires and the speedometer difference is 5.7%.

17565 r15 -2.1% 175/70 r15 +0.6% 185/60 r15 -3.1% 195/60 r15 -1.1% 195/65 r15 +2.1% 205/55 r15 -2.4% 205/60 r15 +0.8% 215/60 r15 +2.7% 225/50 r15 -2.6%
TireSize and Comparison Calculator calculate tire diameter from code and compare speedometer differences for tire sizes. The first number 195 is the tire width in millimeters. The 2nd number 55 is used to calculate the sidewall height or "aspect ratio", by percentage. So, the sidewall height of a 195/55 R 16 tire is 60% of 195 = 192.
Newtire size / R Calculate 185/65 R15 vs 195/65 R15 comparison results: Speedometer difference Welcome to our handy wheel and tire size calculator! Put your current tire eQAOLnd.
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    • 175 65 r15 vs 185 65r15