Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/70r16 vs 205/50r16 Tire Comparison Side By Side
  255/70-16 205/50-16 Difference
Diameter inches (mm) 30.06 (763.4) 24.07 (611.4) -5.98 (-152) -19.9%
Width inches (mm) 10.04 (255) 8.07 (205) -1.97 (-50) -19.6%
Circum. inches (mm) 94.42 (2398.29) 75.62 (1920.77) -18.8 (-477.52) -19.9%
Sidewall Height inches (mm) 7.03 (178.5) 4.04 (102.5) -2.99 (-76) -42.6%
Revolutions per mile (km) 671.04 (416.96) 837.86 (520.62) 166.83 (103.66) 24.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)16.02 mph (25.78 km/h)
25 mph (40.23 km/h)20.02 mph (32.22 km/h)
30 mph (48.28 km/h)24.03 mph (38.67 km/h)
35 mph (56.33 km/h)28.03 mph (45.11 km/h)
40 mph (64.37 km/h)32.04 mph (51.56 km/h)
45 mph (72.42 km/h)36.04 mph (58 km/h)
50 mph (80.47 km/h)40.04 mph (64.45 km/h)
55 mph (88.51 km/h)44.05 mph (70.89 km/h)
60 mph (96.56 km/h)48.05 mph (77.33 km/h)
65 mph (104.61 km/h)52.06 mph (83.78 km/h)
70 mph (112.65 km/h)56.06 mph (90.22 km/h)
75 mph (120.7 km/h)60.07 mph (96.67 km/h)
80 mph (128.75 km/h)64.07 mph (103.11 km/h)
85 mph (136.79 km/h)68.08 mph (109.56 km/h)
90 mph (144.84 km/h)72.08 mph (116 km/h)
95 mph (152.89 km/h)76.08 mph (122.45 km/h)
100 mph (160.93 km/h)80.09 mph (128.89 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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