Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
145/65r15 vs 155/60r15 Tire Comparison Side By Side
  145/65-15 155/60-15 Difference
Diameter inches (mm) 22.42 (569.5) 22.32 (567) -0.1 (-2.5) -0.4%
Width inches (mm) 5.71 (145) 6.1 (155) 0.39 (10) 6.9%
Circum. inches (mm) 70.44 (1789.14) 70.13 (1781.28) -0.31 (-7.85) -0.4%
Sidewall Height inches (mm) 3.71 (94.25) 3.66 (93) -0.05 (-1.25) -1.3%
Revolutions per mile (km) 899.51 (558.93) 903.47 (561.39) 3.97 (2.46) 0.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.91 mph (32.05 km/h)
25 mph (40.23 km/h)24.89 mph (40.06 km/h)
30 mph (48.28 km/h)29.87 mph (48.07 km/h)
35 mph (56.33 km/h)34.85 mph (56.08 km/h)
40 mph (64.37 km/h)39.82 mph (64.09 km/h)
45 mph (72.42 km/h)44.8 mph (72.1 km/h)
50 mph (80.47 km/h)49.78 mph (80.11 km/h)
55 mph (88.51 km/h)54.76 mph (88.13 km/h)
60 mph (96.56 km/h)59.74 mph (96.14 km/h)
65 mph (104.61 km/h)64.71 mph (104.15 km/h)
70 mph (112.65 km/h)69.69 mph (112.16 km/h)
75 mph (120.7 km/h)74.67 mph (120.17 km/h)
80 mph (128.75 km/h)79.65 mph (128.18 km/h)
85 mph (136.79 km/h)84.63 mph (136.19 km/h)
90 mph (144.84 km/h)89.6 mph (144.21 km/h)
95 mph (152.89 km/h)94.58 mph (152.22 km/h)
100 mph (160.93 km/h)99.56 mph (160.23 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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