Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/50r17 vs 345/40r17 Tire Comparison Side By Side
  275/50-17 345/40-17 Difference
Diameter inches (mm) 27.83 (706.8) 27.87 (707.8) 0.04 (1) 0.1%
Width inches (mm) 10.83 (275) 13.58 (345) 2.76 (70) 25.5%
Circum. inches (mm) 87.42 (2220.48) 87.54 (2223.62) 0.12 (3.14) 0.1%
Sidewall Height inches (mm) 5.41 (137.5) 5.43 (138) 0.02 (0.5) 0.4%
Revolutions per mile (km) 724.77 (450.35) 723.75 (449.72) -1.02 (-0.64) -0.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.03 mph (32.23 km/h)
25 mph (40.23 km/h)25.04 mph (40.29 km/h)
30 mph (48.28 km/h)30.04 mph (48.35 km/h)
35 mph (56.33 km/h)35.05 mph (56.41 km/h)
40 mph (64.37 km/h)40.06 mph (64.46 km/h)
45 mph (72.42 km/h)45.06 mph (72.52 km/h)
50 mph (80.47 km/h)50.07 mph (80.58 km/h)
55 mph (88.51 km/h)55.08 mph (88.64 km/h)
60 mph (96.56 km/h)60.08 mph (96.7 km/h)
65 mph (104.61 km/h)65.09 mph (104.76 km/h)
70 mph (112.65 km/h)70.1 mph (112.81 km/h)
75 mph (120.7 km/h)75.11 mph (120.87 km/h)
80 mph (128.75 km/h)80.11 mph (128.93 km/h)
85 mph (136.79 km/h)85.12 mph (136.99 km/h)
90 mph (144.84 km/h)90.13 mph (145.05 km/h)
95 mph (152.89 km/h)95.13 mph (153.1 km/h)
100 mph (160.93 km/h)100.14 mph (161.16 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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