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 285/40r18 Tire Comparison Side By Side
  275/40-18 285/40-18 Difference
Diameter inches (mm) 26.66 (677.2) 26.98 (685.2) 0.31 (8) 1.2%
Width inches (mm) 10.83 (275) 11.22 (285) 0.39 (10) 3.6%
Circum. inches (mm) 83.76 (2127.49) 84.75 (2152.62) 0.99 (25.13) 1.2%
Sidewall Height inches (mm) 4.33 (110) 4.49 (114) 0.16 (4) 3.6%
Revolutions per mile (km) 756.45 (470.04) 747.62 (464.55) -8.83 (-5.49) -1.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.24 mph (32.57 km/h)
25 mph (40.23 km/h)25.3 mph (40.71 km/h)
30 mph (48.28 km/h)30.35 mph (48.85 km/h)
35 mph (56.33 km/h)35.41 mph (56.99 km/h)
40 mph (64.37 km/h)40.47 mph (65.13 km/h)
45 mph (72.42 km/h)45.53 mph (73.28 km/h)
50 mph (80.47 km/h)50.59 mph (81.42 km/h)
55 mph (88.51 km/h)55.65 mph (89.56 km/h)
60 mph (96.56 km/h)60.71 mph (97.7 km/h)
65 mph (104.61 km/h)65.77 mph (105.84 km/h)
70 mph (112.65 km/h)70.83 mph (113.99 km/h)
75 mph (120.7 km/h)75.89 mph (122.13 km/h)
80 mph (128.75 km/h)80.95 mph (130.27 km/h)
85 mph (136.79 km/h)86 mph (138.41 km/h)
90 mph (144.84 km/h)91.06 mph (146.55 km/h)
95 mph (152.89 km/h)96.12 mph (154.69 km/h)
100 mph (160.93 km/h)101.18 mph (162.84 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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