Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
185/55r14 vs 195/45r15 Tire Comparison Side By Side
  185/55-14 195/45-15 Difference
Diameter inches (mm) 22.01 (559.1) 21.91 (556.5) -0.1 (-2.6) -0.5%
Width inches (mm) 7.28 (185) 7.68 (195) 0.39 (10) 5.4%
Circum. inches (mm) 69.15 (1756.46) 68.83 (1748.3) -0.32 (-8.17) -0.5%
Sidewall Height inches (mm) 4.01 (101.75) 3.45 (87.75) -0.55 (-14) -13.8%
Revolutions per mile (km) 916.24 (569.32) 920.52 (571.98) 4.28 (2.66) 0.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.91 mph (32.04 km/h)
25 mph (40.23 km/h)24.88 mph (40.05 km/h)
30 mph (48.28 km/h)29.86 mph (48.06 km/h)
35 mph (56.33 km/h)34.84 mph (56.07 km/h)
40 mph (64.37 km/h)39.81 mph (64.07 km/h)
45 mph (72.42 km/h)44.79 mph (72.08 km/h)
50 mph (80.47 km/h)49.77 mph (80.09 km/h)
55 mph (88.51 km/h)54.74 mph (88.1 km/h)
60 mph (96.56 km/h)59.72 mph (96.11 km/h)
65 mph (104.61 km/h)64.7 mph (104.12 km/h)
70 mph (112.65 km/h)69.67 mph (112.13 km/h)
75 mph (120.7 km/h)74.65 mph (120.14 km/h)
80 mph (128.75 km/h)79.63 mph (128.15 km/h)
85 mph (136.79 km/h)84.6 mph (136.16 km/h)
90 mph (144.84 km/h)89.58 mph (144.17 km/h)
95 mph (152.89 km/h)94.56 mph (152.18 km/h)
100 mph (160.93 km/h)99.53 mph (160.19 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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