Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
185/70r14 vs 205/50r16 Tire Comparison Side By Side
  185/70-14 205/50-16 Difference
Diameter inches (mm) 24.2 (614.6) 24.07 (611.4) -0.13 (-3.2) -0.5%
Width inches (mm) 7.28 (185) 8.07 (205) 0.79 (20) 10.8%
Circum. inches (mm) 76.02 (1930.82) 75.62 (1920.77) -0.4 (-10.05) -0.5%
Sidewall Height inches (mm) 5.1 (129.5) 4.04 (102.5) -1.06 (-27) -20.8%
Revolutions per mile (km) 833.5 (517.91) 837.86 (520.62) 4.36 (2.71) 0.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.9 mph (32.02 km/h)
25 mph (40.23 km/h)24.87 mph (40.02 km/h)
30 mph (48.28 km/h)29.84 mph (48.03 km/h)
35 mph (56.33 km/h)34.82 mph (56.03 km/h)
40 mph (64.37 km/h)39.79 mph (64.04 km/h)
45 mph (72.42 km/h)44.77 mph (72.04 km/h)
50 mph (80.47 km/h)49.74 mph (80.05 km/h)
55 mph (88.51 km/h)54.71 mph (88.05 km/h)
60 mph (96.56 km/h)59.69 mph (96.06 km/h)
65 mph (104.61 km/h)64.66 mph (104.06 km/h)
70 mph (112.65 km/h)69.64 mph (112.07 km/h)
75 mph (120.7 km/h)74.61 mph (120.07 km/h)
80 mph (128.75 km/h)79.58 mph (128.08 km/h)
85 mph (136.79 km/h)84.56 mph (136.08 km/h)
90 mph (144.84 km/h)89.53 mph (144.09 km/h)
95 mph (152.89 km/h)94.51 mph (152.09 km/h)
100 mph (160.93 km/h)99.48 mph (160.1 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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