Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/35r17 vs 215/40r17 Tire Comparison Side By Side
  245/35-17 215/40-17 Difference
Diameter inches (mm) 23.75 (603.3) 23.77 (603.8) 0.02 (0.5) 0.1%
Width inches (mm) 9.65 (245) 8.46 (215) -1.18 (-30) -12.2%
Circum. inches (mm) 74.62 (1895.32) 74.68 (1896.89) 0.06 (1.57) 0.1%
Sidewall Height inches (mm) 3.38 (85.75) 3.39 (86) 0.01 (0.25) 0.3%
Revolutions per mile (km) 849.11 (527.61) 848.41 (527.18) -0.7 (-0.44) -0.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.02 mph (32.21 km/h)
25 mph (40.23 km/h)25.02 mph (40.27 km/h)
30 mph (48.28 km/h)30.02 mph (48.32 km/h)
35 mph (56.33 km/h)35.03 mph (56.37 km/h)
40 mph (64.37 km/h)40.03 mph (64.43 km/h)
45 mph (72.42 km/h)45.04 mph (72.48 km/h)
50 mph (80.47 km/h)50.04 mph (80.53 km/h)
55 mph (88.51 km/h)55.05 mph (88.59 km/h)
60 mph (96.56 km/h)60.05 mph (96.64 km/h)
65 mph (104.61 km/h)65.05 mph (104.69 km/h)
70 mph (112.65 km/h)70.06 mph (112.75 km/h)
75 mph (120.7 km/h)75.06 mph (120.8 km/h)
80 mph (128.75 km/h)80.07 mph (128.85 km/h)
85 mph (136.79 km/h)85.07 mph (136.91 km/h)
90 mph (144.84 km/h)90.07 mph (144.96 km/h)
95 mph (152.89 km/h)95.08 mph (153.01 km/h)
100 mph (160.93 km/h)100.08 mph (161.07 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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