Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
145/60r13 vs 155/55r13 Tire Comparison Side By Side
  145/60-13 155/55-13 Difference
Diameter inches (mm) 19.85 (504.2) 19.71 (500.7) -0.14 (-3.5) -0.7%
Width inches (mm) 5.71 (145) 6.1 (155) 0.39 (10) 6.9%
Circum. inches (mm) 62.36 (1583.99) 61.93 (1573) -0.43 (-11) -0.7%
Sidewall Height inches (mm) 3.43 (87) 3.36 (85.25) -0.07 (-1.75) -2%
Revolutions per mile (km) 1016.01 (631.32) 1023.11 (635.73) 7.1 (4.41) 0.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.86 mph (31.96 km/h)
25 mph (40.23 km/h)24.83 mph (39.95 km/h)
30 mph (48.28 km/h)29.79 mph (47.95 km/h)
35 mph (56.33 km/h)34.76 mph (55.94 km/h)
40 mph (64.37 km/h)39.72 mph (63.93 km/h)
45 mph (72.42 km/h)44.69 mph (71.92 km/h)
50 mph (80.47 km/h)49.65 mph (79.91 km/h)
55 mph (88.51 km/h)54.62 mph (87.9 km/h)
60 mph (96.56 km/h)59.58 mph (95.89 km/h)
65 mph (104.61 km/h)64.55 mph (103.88 km/h)
70 mph (112.65 km/h)69.51 mph (111.87 km/h)
75 mph (120.7 km/h)74.48 mph (119.86 km/h)
80 mph (128.75 km/h)79.44 mph (127.85 km/h)
85 mph (136.79 km/h)84.41 mph (135.84 km/h)
90 mph (144.84 km/h)89.38 mph (143.84 km/h)
95 mph (152.89 km/h)94.34 mph (151.83 km/h)
100 mph (160.93 km/h)99.31 mph (159.82 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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