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 295/70r18 Tire Comparison Side By Side
  255/70-18 295/70-18 Difference
Diameter inches (mm) 32.06 (814.2) 34.26 (870.2) 2.2 (56) 6.9%
Width inches (mm) 10.04 (255) 11.61 (295) 1.57 (40) 15.7%
Circum. inches (mm) 100.7 (2557.88) 107.63 (2733.81) 6.93 (175.93) 6.9%
Sidewall Height inches (mm) 7.03 (178.5) 8.13 (206.5) 1.1 (28) 15.7%
Revolutions per mile (km) 629.17 (390.95) 588.68 (365.79) -40.49 (-25.16) -6.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.38 mph (34.4 km/h)
25 mph (40.23 km/h)26.72 mph (43 km/h)
30 mph (48.28 km/h)32.06 mph (51.6 km/h)
35 mph (56.33 km/h)37.41 mph (60.2 km/h)
40 mph (64.37 km/h)42.75 mph (68.8 km/h)
45 mph (72.42 km/h)48.1 mph (77.4 km/h)
50 mph (80.47 km/h)53.44 mph (86 km/h)
55 mph (88.51 km/h)58.78 mph (94.6 km/h)
60 mph (96.56 km/h)64.13 mph (103.2 km/h)
65 mph (104.61 km/h)69.47 mph (111.8 km/h)
70 mph (112.65 km/h)74.81 mph (120.4 km/h)
75 mph (120.7 km/h)80.16 mph (129 km/h)
80 mph (128.75 km/h)85.5 mph (137.6 km/h)
85 mph (136.79 km/h)90.85 mph (146.2 km/h)
90 mph (144.84 km/h)96.19 mph (154.8 km/h)
95 mph (152.89 km/h)101.53 mph (163.4 km/h)
100 mph (160.93 km/h)106.88 mph (172 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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