Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
305/30r22 vs 235/30r22 Tire Comparison Side By Side
  305/30-22 235/30-22 Difference
Diameter inches (mm) 29.2 (741.8) 27.55 (699.8) -1.65 (-42) -5.7%
Width inches (mm) 12.01 (305) 9.25 (235) -2.76 (-70) -23%
Circum. inches (mm) 91.75 (2330.43) 86.55 (2198.49) -5.19 (-131.95) -5.7%
Sidewall Height inches (mm) 3.6 (91.5) 2.78 (70.5) -0.83 (-21) -23%
Revolutions per mile (km) 690.58 (429.1) 732.02 (454.86) 41.45 (25.75) 6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.87 mph (30.36 km/h)
25 mph (40.23 km/h)23.58 mph (37.96 km/h)
30 mph (48.28 km/h)28.3 mph (45.55 km/h)
35 mph (56.33 km/h)33.02 mph (53.14 km/h)
40 mph (64.37 km/h)37.74 mph (60.73 km/h)
45 mph (72.42 km/h)42.45 mph (68.32 km/h)
50 mph (80.47 km/h)47.17 mph (75.91 km/h)
55 mph (88.51 km/h)51.89 mph (83.5 km/h)
60 mph (96.56 km/h)56.6 mph (91.09 km/h)
65 mph (104.61 km/h)61.32 mph (98.68 km/h)
70 mph (112.65 km/h)66.04 mph (106.28 km/h)
75 mph (120.7 km/h)70.75 mph (113.87 km/h)
80 mph (128.75 km/h)75.47 mph (121.46 km/h)
85 mph (136.79 km/h)80.19 mph (129.05 km/h)
90 mph (144.84 km/h)84.9 mph (136.64 km/h)
95 mph (152.89 km/h)89.62 mph (144.23 km/h)
100 mph (160.93 km/h)94.34 mph (151.82 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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