Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/60r18 vs 245/65r17 Tire Comparison Side By Side
  245/60-18 245/65-17 Difference
Diameter inches (mm) 29.57 (751.2) 29.54 (750.3) -0.04 (-0.9) -0.1%
Width inches (mm) 9.65 (245) 9.65 (245) 0 (0) 0%
Circum. inches (mm) 92.91 (2359.96) 92.8 (2357.14) -0.11 (-2.83) -0.1%
Sidewall Height inches (mm) 5.79 (147) 6.27 (159.25) 0.48 (12.25) 8.3%
Revolutions per mile (km) 681.94 (423.73) 682.75 (424.24) 0.82 (0.51) 0.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.98 mph (32.15 km/h)
25 mph (40.23 km/h)24.97 mph (40.19 km/h)
30 mph (48.28 km/h)29.96 mph (48.22 km/h)
35 mph (56.33 km/h)34.96 mph (56.26 km/h)
40 mph (64.37 km/h)39.95 mph (64.3 km/h)
45 mph (72.42 km/h)44.95 mph (72.33 km/h)
50 mph (80.47 km/h)49.94 mph (80.37 km/h)
55 mph (88.51 km/h)54.93 mph (88.41 km/h)
60 mph (96.56 km/h)59.93 mph (96.45 km/h)
65 mph (104.61 km/h)64.92 mph (104.48 km/h)
70 mph (112.65 km/h)69.92 mph (112.52 km/h)
75 mph (120.7 km/h)74.91 mph (120.56 km/h)
80 mph (128.75 km/h)79.9 mph (128.59 km/h)
85 mph (136.79 km/h)84.9 mph (136.63 km/h)
90 mph (144.84 km/h)89.89 mph (144.67 km/h)
95 mph (152.89 km/h)94.89 mph (152.7 km/h)
100 mph (160.93 km/h)99.88 mph (160.74 km/h)

Gear Ratio / RPMs for New Tire (@ 65 mph)
2.35 2.73 2.94 3.07 3.21 3.31 3.42 3.55 3.73 3.91 4.11 4.27 4.56 4.88 5.13 5.29 5.38 5.71 6.17 7.17
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