Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/65r17 vs 255/50r20 Tire Comparison Side By Side
  225/65-17 255/50-20 Difference
Diameter inches (mm) 28.52 (724.3) 30.04 (763) 1.52 (38.7) 5.3%
Width inches (mm) 8.86 (225) 10.04 (255) 1.18 (30) 13.3%
Circum. inches (mm) 89.58 (2275.46) 94.37 (2397.04) 4.79 (121.58) 5.3%
Sidewall Height inches (mm) 5.76 (146.25) 5.02 (127.5) -0.74 (-18.75) -12.8%
Revolutions per mile (km) 707.26 (439.47) 671.39 (417.18) -35.87 (-22.29) -5.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.07 mph (33.91 km/h)
25 mph (40.23 km/h)26.34 mph (42.38 km/h)
30 mph (48.28 km/h)31.6 mph (50.86 km/h)
35 mph (56.33 km/h)36.87 mph (59.34 km/h)
40 mph (64.37 km/h)42.14 mph (67.81 km/h)
45 mph (72.42 km/h)47.4 mph (76.29 km/h)
50 mph (80.47 km/h)52.67 mph (84.77 km/h)
55 mph (88.51 km/h)57.94 mph (93.24 km/h)
60 mph (96.56 km/h)63.21 mph (101.72 km/h)
65 mph (104.61 km/h)68.47 mph (110.2 km/h)
70 mph (112.65 km/h)73.74 mph (118.67 km/h)
75 mph (120.7 km/h)79.01 mph (127.15 km/h)
80 mph (128.75 km/h)84.27 mph (135.63 km/h)
85 mph (136.79 km/h)89.54 mph (144.1 km/h)
90 mph (144.84 km/h)94.81 mph (152.58 km/h)
95 mph (152.89 km/h)100.08 mph (161.06 km/h)
100 mph (160.93 km/h)105.34 mph (169.53 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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