Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/40r18 vs 285/35r18 Tire Comparison Side By Side
  275/40-18 285/35-18 Difference
Diameter inches (mm) 26.66 (677.2) 25.85 (656.7) -0.81 (-20.5) -3%
Width inches (mm) 10.83 (275) 11.22 (285) 0.39 (10) 3.6%
Circum. inches (mm) 83.76 (2127.49) 81.22 (2063.08) -2.54 (-64.4) -3%
Sidewall Height inches (mm) 4.33 (110) 3.93 (99.75) -0.4 (-10.25) -9.3%
Revolutions per mile (km) 756.45 (470.04) 780.07 (484.71) 23.61 (14.67) 3.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.39 mph (31.21 km/h)
25 mph (40.23 km/h)24.24 mph (39.02 km/h)
30 mph (48.28 km/h)29.09 mph (46.82 km/h)
35 mph (56.33 km/h)33.94 mph (54.62 km/h)
40 mph (64.37 km/h)38.79 mph (62.43 km/h)
45 mph (72.42 km/h)43.64 mph (70.23 km/h)
50 mph (80.47 km/h)48.49 mph (78.03 km/h)
55 mph (88.51 km/h)53.34 mph (85.83 km/h)
60 mph (96.56 km/h)58.18 mph (93.64 km/h)
65 mph (104.61 km/h)63.03 mph (101.44 km/h)
70 mph (112.65 km/h)67.88 mph (109.24 km/h)
75 mph (120.7 km/h)72.73 mph (117.05 km/h)
80 mph (128.75 km/h)77.58 mph (124.85 km/h)
85 mph (136.79 km/h)82.43 mph (132.65 km/h)
90 mph (144.84 km/h)87.28 mph (140.46 km/h)
95 mph (152.89 km/h)92.12 mph (148.26 km/h)
100 mph (160.93 km/h)96.97 mph (156.06 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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