Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/60r18 vs 275/70r18 Tire Comparison Side By Side
  275/60-18 275/70-18 Difference
Diameter inches (mm) 30.99 (787.2) 33.16 (842.2) 2.17 (55) 7%
Width inches (mm) 10.83 (275) 10.83 (275) 0 (0) 0%
Circum. inches (mm) 97.36 (2473.06) 104.17 (2645.85) 6.8 (172.79) 7%
Sidewall Height inches (mm) 6.5 (165) 7.58 (192.5) 1.08 (27.5) 16.7%
Revolutions per mile (km) 650.75 (404.36) 608.25 (377.95) -42.5 (-26.41) -6.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.4 mph (34.44 km/h)
25 mph (40.23 km/h)26.75 mph (43.04 km/h)
30 mph (48.28 km/h)32.1 mph (51.65 km/h)
35 mph (56.33 km/h)37.45 mph (60.26 km/h)
40 mph (64.37 km/h)42.79 mph (68.87 km/h)
45 mph (72.42 km/h)48.14 mph (77.48 km/h)
50 mph (80.47 km/h)53.49 mph (86.09 km/h)
55 mph (88.51 km/h)58.84 mph (94.7 km/h)
60 mph (96.56 km/h)64.19 mph (103.31 km/h)
65 mph (104.61 km/h)69.54 mph (111.92 km/h)
70 mph (112.65 km/h)74.89 mph (120.53 km/h)
75 mph (120.7 km/h)80.24 mph (129.13 km/h)
80 mph (128.75 km/h)85.59 mph (137.74 km/h)
85 mph (136.79 km/h)90.94 mph (146.35 km/h)
90 mph (144.84 km/h)96.29 mph (154.96 km/h)
95 mph (152.89 km/h)101.64 mph (163.57 km/h)
100 mph (160.93 km/h)106.99 mph (172.18 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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