Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/30r22 vs 245/40r22 Tire Comparison Side By Side
  235/30-22 245/40-22 Difference
Diameter inches (mm) 27.55 (699.8) 29.72 (754.8) 2.17 (55) 7.9%
Width inches (mm) 9.25 (235) 9.65 (245) 0.39 (10) 4.3%
Circum. inches (mm) 86.55 (2198.49) 93.36 (2371.27) 6.8 (172.79) 7.9%
Sidewall Height inches (mm) 2.78 (70.5) 3.86 (98) 1.08 (27.5) 39%
Revolutions per mile (km) 732.02 (454.86) 678.68 (421.71) -53.34 (-33.14) -7.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.57 mph (34.72 km/h)
25 mph (40.23 km/h)26.96 mph (43.4 km/h)
30 mph (48.28 km/h)32.36 mph (52.07 km/h)
35 mph (56.33 km/h)37.75 mph (60.75 km/h)
40 mph (64.37 km/h)43.14 mph (69.43 km/h)
45 mph (72.42 km/h)48.54 mph (78.11 km/h)
50 mph (80.47 km/h)53.93 mph (86.79 km/h)
55 mph (88.51 km/h)59.32 mph (95.47 km/h)
60 mph (96.56 km/h)64.72 mph (104.15 km/h)
65 mph (104.61 km/h)70.11 mph (112.83 km/h)
70 mph (112.65 km/h)75.5 mph (121.51 km/h)
75 mph (120.7 km/h)80.89 mph (130.19 km/h)
80 mph (128.75 km/h)86.29 mph (138.87 km/h)
85 mph (136.79 km/h)91.68 mph (147.55 km/h)
90 mph (144.84 km/h)97.07 mph (156.22 km/h)
95 mph (152.89 km/h)102.47 mph (164.9 km/h)
100 mph (160.93 km/h)107.86 mph (173.58 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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