Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/70r17 vs 275/65r18 Tire Comparison Side By Side
  275/70-17 275/65-18 Difference
Diameter inches (mm) 32.16 (816.8) 32.07 (814.7) -0.08 (-2.1) -0.3%
Width inches (mm) 10.83 (275) 10.83 (275) 0 (0) 0%
Circum. inches (mm) 101.03 (2566.05) 100.77 (2559.46) -0.26 (-6.6) -0.3%
Sidewall Height inches (mm) 7.58 (192.5) 7.04 (178.75) -0.54 (-13.75) -7.1%
Revolutions per mile (km) 627.17 (389.7) 628.78 (390.71) 1.62 (1) 0.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.95 mph (32.1 km/h)
25 mph (40.23 km/h)24.94 mph (40.13 km/h)
30 mph (48.28 km/h)29.92 mph (48.16 km/h)
35 mph (56.33 km/h)34.91 mph (56.18 km/h)
40 mph (64.37 km/h)39.9 mph (64.21 km/h)
45 mph (72.42 km/h)44.88 mph (72.23 km/h)
50 mph (80.47 km/h)49.87 mph (80.26 km/h)
55 mph (88.51 km/h)54.86 mph (88.29 km/h)
60 mph (96.56 km/h)59.85 mph (96.31 km/h)
65 mph (104.61 km/h)64.83 mph (104.34 km/h)
70 mph (112.65 km/h)69.82 mph (112.36 km/h)
75 mph (120.7 km/h)74.81 mph (120.39 km/h)
80 mph (128.75 km/h)79.79 mph (128.42 km/h)
85 mph (136.79 km/h)84.78 mph (136.44 km/h)
90 mph (144.84 km/h)89.77 mph (144.47 km/h)
95 mph (152.89 km/h)94.76 mph (152.49 km/h)
100 mph (160.93 km/h)99.74 mph (160.52 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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