Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/70r10 vs 145/70r12 Tire Comparison Side By Side
  165/70-10 145/70-12 Difference
Diameter inches (mm) 19.09 (485) 19.99 (507.8) 0.9 (22.8) 4.7%
Width inches (mm) 6.5 (165) 5.71 (145) -0.79 (-20) -12.1%
Circum. inches (mm) 59.99 (1523.67) 62.81 (1595.3) 2.82 (71.63) 4.7%
Sidewall Height inches (mm) 4.55 (115.5) 4 (101.5) -0.55 (-14) -12.1%
Revolutions per mile (km) 1056.23 (656.31) 1008.8 (626.84) -47.42 (-29.47) -4.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.94 mph (33.7 km/h)
25 mph (40.23 km/h)26.18 mph (42.13 km/h)
30 mph (48.28 km/h)31.41 mph (50.55 km/h)
35 mph (56.33 km/h)36.65 mph (58.98 km/h)
40 mph (64.37 km/h)41.88 mph (67.4 km/h)
45 mph (72.42 km/h)47.12 mph (75.83 km/h)
50 mph (80.47 km/h)52.35 mph (84.25 km/h)
55 mph (88.51 km/h)57.59 mph (92.68 km/h)
60 mph (96.56 km/h)62.82 mph (101.1 km/h)
65 mph (104.61 km/h)68.06 mph (109.53 km/h)
70 mph (112.65 km/h)73.29 mph (117.95 km/h)
75 mph (120.7 km/h)78.53 mph (126.38 km/h)
80 mph (128.75 km/h)83.76 mph (134.8 km/h)
85 mph (136.79 km/h)89 mph (143.23 km/h)
90 mph (144.84 km/h)94.23 mph (151.65 km/h)
95 mph (152.89 km/h)99.47 mph (160.08 km/h)
100 mph (160.93 km/h)104.7 mph (168.5 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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