Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
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265/65r18 vs 275/60r18 Tire Comparison Side By Side
  265/65-18 275/60-18 Difference
Diameter inches (mm) 31.56 (801.7) 30.99 (787.2) -0.57 (-14.5) -1.8%
Width inches (mm) 10.43 (265) 10.83 (275) 0.39 (10) 3.8%
Circum. inches (mm) 99.16 (2518.61) 97.36 (2473.06) -1.79 (-45.55) -1.8%
Sidewall Height inches (mm) 6.78 (172.25) 6.5 (165) -0.29 (-7.25) -4.2%
Revolutions per mile (km) 638.98 (397.04) 650.75 (404.36) 11.77 (7.31) 1.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.64 mph (31.6 km/h)
25 mph (40.23 km/h)24.55 mph (39.51 km/h)
30 mph (48.28 km/h)29.46 mph (47.41 km/h)
35 mph (56.33 km/h)34.37 mph (55.31 km/h)
40 mph (64.37 km/h)39.28 mph (63.21 km/h)
45 mph (72.42 km/h)44.19 mph (71.11 km/h)
50 mph (80.47 km/h)49.1 mph (79.01 km/h)
55 mph (88.51 km/h)54.01 mph (86.91 km/h)
60 mph (96.56 km/h)58.91 mph (94.81 km/h)
65 mph (104.61 km/h)63.82 mph (102.72 km/h)
70 mph (112.65 km/h)68.73 mph (110.62 km/h)
75 mph (120.7 km/h)73.64 mph (118.52 km/h)
80 mph (128.75 km/h)78.55 mph (126.42 km/h)
85 mph (136.79 km/h)83.46 mph (134.32 km/h)
90 mph (144.84 km/h)88.37 mph (142.22 km/h)
95 mph (152.89 km/h)93.28 mph (150.12 km/h)
100 mph (160.93 km/h)98.19 mph (158.02 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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