Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/30r22 vs 240/35r20 Tire Comparison Side By Side
  255/30-22 240/35-20 Difference
Diameter inches (mm) 28.02 (711.8) 26.61 (676) -1.41 (-35.8) -5%
Width inches (mm) 10.04 (255) 9.45 (240) -0.59 (-15) -5.9%
Circum. inches (mm) 88.04 (2236.19) 83.61 (2123.72) -4.43 (-112.47) -5%
Sidewall Height inches (mm) 3.01 (76.5) 3.31 (84) 0.3 (7.5) 9.8%
Revolutions per mile (km) 719.68 (447.19) 757.8 (470.87) 38.11 (23.68) 5.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.99 mph (30.57 km/h)
25 mph (40.23 km/h)23.74 mph (38.21 km/h)
30 mph (48.28 km/h)28.49 mph (45.85 km/h)
35 mph (56.33 km/h)33.24 mph (53.49 km/h)
40 mph (64.37 km/h)37.99 mph (61.14 km/h)
45 mph (72.42 km/h)42.74 mph (68.78 km/h)
50 mph (80.47 km/h)47.49 mph (76.42 km/h)
55 mph (88.51 km/h)52.23 mph (84.06 km/h)
60 mph (96.56 km/h)56.98 mph (91.7 km/h)
65 mph (104.61 km/h)61.73 mph (99.35 km/h)
70 mph (112.65 km/h)66.48 mph (106.99 km/h)
75 mph (120.7 km/h)71.23 mph (114.63 km/h)
80 mph (128.75 km/h)75.98 mph (122.27 km/h)
85 mph (136.79 km/h)80.72 mph (129.91 km/h)
90 mph (144.84 km/h)85.47 mph (137.56 km/h)
95 mph (152.89 km/h)90.22 mph (145.2 km/h)
100 mph (160.93 km/h)94.97 mph (152.84 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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