Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/70r18 vs 265/70r18 Tire Comparison Side By Side
  275/70-18 265/70-18 Difference
Diameter inches (mm) 33.16 (842.2) 32.61 (828.2) -0.55 (-14) -1.7%
Width inches (mm) 10.83 (275) 10.43 (265) -0.39 (-10) -3.6%
Circum. inches (mm) 104.17 (2645.85) 102.44 (2601.87) -1.73 (-43.98) -1.7%
Sidewall Height inches (mm) 7.58 (192.5) 7.3 (185.5) -0.28 (-7) -3.6%
Revolutions per mile (km) 608.25 (377.95) 618.53 (384.34) 10.28 (6.39) 1.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.67 mph (31.65 km/h)
25 mph (40.23 km/h)24.58 mph (39.56 km/h)
30 mph (48.28 km/h)29.5 mph (47.48 km/h)
35 mph (56.33 km/h)34.42 mph (55.39 km/h)
40 mph (64.37 km/h)39.34 mph (63.3 km/h)
45 mph (72.42 km/h)44.25 mph (71.22 km/h)
50 mph (80.47 km/h)49.17 mph (79.13 km/h)
55 mph (88.51 km/h)54.09 mph (87.04 km/h)
60 mph (96.56 km/h)59 mph (94.96 km/h)
65 mph (104.61 km/h)63.92 mph (102.87 km/h)
70 mph (112.65 km/h)68.84 mph (110.78 km/h)
75 mph (120.7 km/h)73.75 mph (118.69 km/h)
80 mph (128.75 km/h)78.67 mph (126.61 km/h)
85 mph (136.79 km/h)83.59 mph (134.52 km/h)
90 mph (144.84 km/h)88.5 mph (142.43 km/h)
95 mph (152.89 km/h)93.42 mph (150.35 km/h)
100 mph (160.93 km/h)98.34 mph (158.26 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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