Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/60r18 vs 255/70r18 Tire Comparison Side By Side
  255/60-18 255/70-18 Difference
Diameter inches (mm) 30.05 (763.2) 32.06 (814.2) 2.01 (51) 6.7%
Width inches (mm) 10.04 (255) 10.04 (255) 0 (0) 0%
Circum. inches (mm) 94.4 (2397.66) 100.7 (2557.88) 6.31 (160.22) 6.7%
Sidewall Height inches (mm) 6.02 (153) 7.03 (178.5) 1 (25.5) 16.7%
Revolutions per mile (km) 671.21 (417.07) 629.17 (390.95) -42.04 (-26.12) -6.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.34 mph (34.34 km/h)
25 mph (40.23 km/h)26.67 mph (42.92 km/h)
30 mph (48.28 km/h)32 mph (51.51 km/h)
35 mph (56.33 km/h)37.34 mph (60.09 km/h)
40 mph (64.37 km/h)42.67 mph (68.68 km/h)
45 mph (72.42 km/h)48.01 mph (77.26 km/h)
50 mph (80.47 km/h)53.34 mph (85.84 km/h)
55 mph (88.51 km/h)58.68 mph (94.43 km/h)
60 mph (96.56 km/h)64.01 mph (103.01 km/h)
65 mph (104.61 km/h)69.34 mph (111.6 km/h)
70 mph (112.65 km/h)74.68 mph (120.18 km/h)
75 mph (120.7 km/h)80.01 mph (128.77 km/h)
80 mph (128.75 km/h)85.35 mph (137.35 km/h)
85 mph (136.79 km/h)90.68 mph (145.94 km/h)
90 mph (144.84 km/h)96.01 mph (154.52 km/h)
95 mph (152.89 km/h)101.35 mph (163.1 km/h)
100 mph (160.93 km/h)106.68 mph (171.69 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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