Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/60r17 vs 275/55r17 Tire Comparison Side By Side
  255/60-17 275/55-17 Difference
Diameter inches (mm) 29.05 (737.8) 28.91 (734.3) -0.14 (-3.5) -0.5%
Width inches (mm) 10.04 (255) 10.83 (275) 0.79 (20) 7.8%
Circum. inches (mm) 91.25 (2317.87) 90.82 (2306.87) -0.43 (-11) -0.5%
Sidewall Height inches (mm) 6.02 (153) 5.95 (151.25) -0.07 (-1.75) -1.1%
Revolutions per mile (km) 694.32 (431.43) 697.63 (433.49) 3.31 (2.06) 0.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.91 mph (32.03 km/h)
25 mph (40.23 km/h)24.88 mph (40.04 km/h)
30 mph (48.28 km/h)29.86 mph (48.05 km/h)
35 mph (56.33 km/h)34.83 mph (56.06 km/h)
40 mph (64.37 km/h)39.81 mph (64.07 km/h)
45 mph (72.42 km/h)44.79 mph (72.08 km/h)
50 mph (80.47 km/h)49.76 mph (80.09 km/h)
55 mph (88.51 km/h)54.74 mph (88.09 km/h)
60 mph (96.56 km/h)59.72 mph (96.1 km/h)
65 mph (104.61 km/h)64.69 mph (104.11 km/h)
70 mph (112.65 km/h)69.67 mph (112.12 km/h)
75 mph (120.7 km/h)74.64 mph (120.13 km/h)
80 mph (128.75 km/h)79.62 mph (128.14 km/h)
85 mph (136.79 km/h)84.6 mph (136.15 km/h)
90 mph (144.84 km/h)89.57 mph (144.15 km/h)
95 mph (152.89 km/h)94.55 mph (152.16 km/h)
100 mph (160.93 km/h)99.53 mph (160.17 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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