Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/40r10 vs 215/35r12 Tire Comparison Side By Side
  225/40-10 215/35-12 Difference
Diameter inches (mm) 17.09 (434) 17.93 (455.3) 0.84 (21.3) 4.9%
Width inches (mm) 8.86 (225) 8.46 (215) -0.39 (-10) -4.4%
Circum. inches (mm) 53.68 (1363.45) 56.31 (1430.37) 2.63 (66.92) 4.9%
Sidewall Height inches (mm) 3.54 (90) 2.96 (75.25) -0.58 (-14.75) -16.4%
Revolutions per mile (km) 1180.35 (733.43) 1125.13 (699.12) -55.22 (-34.31) -4.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.98 mph (33.77 km/h)
25 mph (40.23 km/h)26.23 mph (42.21 km/h)
30 mph (48.28 km/h)31.47 mph (50.65 km/h)
35 mph (56.33 km/h)36.72 mph (59.09 km/h)
40 mph (64.37 km/h)41.96 mph (67.53 km/h)
45 mph (72.42 km/h)47.21 mph (75.97 km/h)
50 mph (80.47 km/h)52.45 mph (84.42 km/h)
55 mph (88.51 km/h)57.7 mph (92.86 km/h)
60 mph (96.56 km/h)62.94 mph (101.3 km/h)
65 mph (104.61 km/h)68.19 mph (109.74 km/h)
70 mph (112.65 km/h)73.44 mph (118.18 km/h)
75 mph (120.7 km/h)78.68 mph (126.62 km/h)
80 mph (128.75 km/h)83.93 mph (135.07 km/h)
85 mph (136.79 km/h)89.17 mph (143.51 km/h)
90 mph (144.84 km/h)94.42 mph (151.95 km/h)
95 mph (152.89 km/h)99.66 mph (160.39 km/h)
100 mph (160.93 km/h)104.91 mph (168.83 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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