Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/40r19 vs 235/45r18 Tire Comparison Side By Side
  235/40-19 235/45-18 Difference
Diameter inches (mm) 26.4 (670.6) 26.33 (668.7) -0.07 (-1.9) -0.3%
Width inches (mm) 9.25 (235) 9.25 (235) 0 (0) 0%
Circum. inches (mm) 82.94 (2106.75) 82.71 (2100.78) -0.24 (-5.97) -0.3%
Sidewall Height inches (mm) 3.7 (94) 4.16 (105.75) 0.46 (11.75) 12.5%
Revolutions per mile (km) 763.9 (474.66) 766.07 (476.01) 2.17 (1.35) 0.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.94 mph (32.1 km/h)
25 mph (40.23 km/h)24.93 mph (40.12 km/h)
30 mph (48.28 km/h)29.92 mph (48.14 km/h)
35 mph (56.33 km/h)34.9 mph (56.17 km/h)
40 mph (64.37 km/h)39.89 mph (64.19 km/h)
45 mph (72.42 km/h)44.87 mph (72.22 km/h)
50 mph (80.47 km/h)49.86 mph (80.24 km/h)
55 mph (88.51 km/h)54.84 mph (88.26 km/h)
60 mph (96.56 km/h)59.83 mph (96.29 km/h)
65 mph (104.61 km/h)64.82 mph (104.31 km/h)
70 mph (112.65 km/h)69.8 mph (112.34 km/h)
75 mph (120.7 km/h)74.79 mph (120.36 km/h)
80 mph (128.75 km/h)79.77 mph (128.38 km/h)
85 mph (136.79 km/h)84.76 mph (136.41 km/h)
90 mph (144.84 km/h)89.75 mph (144.43 km/h)
95 mph (152.89 km/h)94.73 mph (152.45 km/h)
100 mph (160.93 km/h)99.72 mph (160.48 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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