Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/70r18 vs 255/75r17 Tire Comparison Side By Side
  255/70-18 255/75-17 Difference
Diameter inches (mm) 32.06 (814.2) 32.06 (814.3) 0 (0.1) 0%
Width inches (mm) 10.04 (255) 10.04 (255) 0 (0) 0%
Circum. inches (mm) 100.7 (2557.88) 100.72 (2558.2) 0.01 (0.31) 0%
Sidewall Height inches (mm) 7.03 (178.5) 7.53 (191.25) 0.5 (12.75) 7.1%
Revolutions per mile (km) 629.17 (390.95) 629.09 (390.9) -0.08 (-0.05) -0%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20 mph (32.19 km/h)
25 mph (40.23 km/h)25 mph (40.24 km/h)
30 mph (48.28 km/h)30 mph (48.29 km/h)
35 mph (56.33 km/h)35 mph (56.33 km/h)
40 mph (64.37 km/h)40 mph (64.38 km/h)
45 mph (72.42 km/h)45.01 mph (72.43 km/h)
50 mph (80.47 km/h)50.01 mph (80.48 km/h)
55 mph (88.51 km/h)55.01 mph (88.52 km/h)
60 mph (96.56 km/h)60.01 mph (96.57 km/h)
65 mph (104.61 km/h)65.01 mph (104.62 km/h)
70 mph (112.65 km/h)70.01 mph (112.67 km/h)
75 mph (120.7 km/h)75.01 mph (120.72 km/h)
80 mph (128.75 km/h)80.01 mph (128.76 km/h)
85 mph (136.79 km/h)85.01 mph (136.81 km/h)
90 mph (144.84 km/h)90.01 mph (144.86 km/h)
95 mph (152.89 km/h)95.01 mph (152.91 km/h)
100 mph (160.93 km/h)100.01 mph (160.95 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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