Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
155/85r18 vs 225/65r17 Tire Comparison Side By Side
  155/85-18 225/65-17 Difference
Diameter inches (mm) 28.37 (720.7) 28.52 (724.3) 0.14 (3.6) 0.5%
Width inches (mm) 6.1 (155) 8.86 (225) 2.76 (70) 45.2%
Circum. inches (mm) 89.14 (2264.15) 89.58 (2275.46) 0.45 (11.31) 0.5%
Sidewall Height inches (mm) 5.19 (131.75) 5.76 (146.25) 0.57 (14.5) 11%
Revolutions per mile (km) 710.8 (441.67) 707.26 (439.47) -3.53 (-2.2) -0.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.1 mph (32.35 km/h)
25 mph (40.23 km/h)25.12 mph (40.43 km/h)
30 mph (48.28 km/h)30.15 mph (48.52 km/h)
35 mph (56.33 km/h)35.17 mph (56.61 km/h)
40 mph (64.37 km/h)40.2 mph (64.7 km/h)
45 mph (72.42 km/h)45.22 mph (72.78 km/h)
50 mph (80.47 km/h)50.25 mph (80.87 km/h)
55 mph (88.51 km/h)55.27 mph (88.96 km/h)
60 mph (96.56 km/h)60.3 mph (97.04 km/h)
65 mph (104.61 km/h)65.32 mph (105.13 km/h)
70 mph (112.65 km/h)70.35 mph (113.22 km/h)
75 mph (120.7 km/h)75.37 mph (121.3 km/h)
80 mph (128.75 km/h)80.4 mph (129.39 km/h)
85 mph (136.79 km/h)85.42 mph (137.48 km/h)
90 mph (144.84 km/h)90.45 mph (145.56 km/h)
95 mph (152.89 km/h)95.47 mph (153.65 km/h)
100 mph (160.93 km/h)100.5 mph (161.74 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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