Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
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145/70r12 vs 165/60r12 Tire Comparison Side By Side
  145/70-12 165/60-12 Difference
Diameter inches (mm) 19.99 (507.8) 19.8 (502.8) -0.2 (-5) -1%
Width inches (mm) 5.71 (145) 6.5 (165) 0.79 (20) 13.8%
Circum. inches (mm) 62.81 (1595.3) 62.19 (1579.59) -0.62 (-15.71) -1%
Sidewall Height inches (mm) 4 (101.5) 3.9 (99) -0.1 (-2.5) -2.5%
Revolutions per mile (km) 1008.8 (626.84) 1018.83 (633.07) 10.03 (6.23) 1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.8 mph (31.87 km/h)
25 mph (40.23 km/h)24.75 mph (39.84 km/h)
30 mph (48.28 km/h)29.7 mph (47.81 km/h)
35 mph (56.33 km/h)34.66 mph (55.77 km/h)
40 mph (64.37 km/h)39.61 mph (63.74 km/h)
45 mph (72.42 km/h)44.56 mph (71.71 km/h)
50 mph (80.47 km/h)49.51 mph (79.68 km/h)
55 mph (88.51 km/h)54.46 mph (87.64 km/h)
60 mph (96.56 km/h)59.41 mph (95.61 km/h)
65 mph (104.61 km/h)64.36 mph (103.58 km/h)
70 mph (112.65 km/h)69.31 mph (111.55 km/h)
75 mph (120.7 km/h)74.26 mph (119.51 km/h)
80 mph (128.75 km/h)79.21 mph (127.48 km/h)
85 mph (136.79 km/h)84.16 mph (135.45 km/h)
90 mph (144.84 km/h)89.11 mph (143.42 km/h)
95 mph (152.89 km/h)94.06 mph (151.38 km/h)
100 mph (160.93 km/h)99.02 mph (159.35 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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