Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/75r17 vs 315/70r17 Tire Comparison Side By Side
  255/75-17 315/70-17 Difference
Diameter inches (mm) 32.06 (814.3) 34.36 (872.8) 2.3 (58.5) 7.2%
Width inches (mm) 10.04 (255) 12.4 (315) 2.36 (60) 23.5%
Circum. inches (mm) 100.72 (2558.2) 107.95 (2741.98) 7.24 (183.78) 7.2%
Sidewall Height inches (mm) 7.53 (191.25) 8.68 (220.5) 1.15 (29.25) 15.3%
Revolutions per mile (km) 629.09 (390.9) 586.93 (364.7) -42.17 (-26.2) -6.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.44 mph (34.5 km/h)
25 mph (40.23 km/h)26.8 mph (43.12 km/h)
30 mph (48.28 km/h)32.16 mph (51.75 km/h)
35 mph (56.33 km/h)37.51 mph (60.37 km/h)
40 mph (64.37 km/h)42.87 mph (69 km/h)
45 mph (72.42 km/h)48.23 mph (77.62 km/h)
50 mph (80.47 km/h)53.59 mph (86.25 km/h)
55 mph (88.51 km/h)58.95 mph (94.87 km/h)
60 mph (96.56 km/h)64.31 mph (103.5 km/h)
65 mph (104.61 km/h)69.67 mph (112.12 km/h)
70 mph (112.65 km/h)75.03 mph (120.75 km/h)
75 mph (120.7 km/h)80.39 mph (129.37 km/h)
80 mph (128.75 km/h)85.75 mph (138 km/h)
85 mph (136.79 km/h)91.11 mph (146.62 km/h)
90 mph (144.84 km/h)96.47 mph (155.25 km/h)
95 mph (152.89 km/h)101.82 mph (163.87 km/h)
100 mph (160.93 km/h)107.18 mph (172.5 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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