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 245/45r17 Tire Comparison Side By Side
  255/60-17 245/45-17 Difference
Diameter inches (mm) 29.05 (737.8) 25.68 (652.3) -3.37 (-85.5) -11.6%
Width inches (mm) 10.04 (255) 9.65 (245) -0.39 (-10) -3.9%
Circum. inches (mm) 91.25 (2317.87) 80.68 (2049.26) -10.58 (-268.61) -11.6%
Sidewall Height inches (mm) 6.02 (153) 4.34 (110.25) -1.68 (-42.75) -27.9%
Revolutions per mile (km) 694.32 (431.43) 785.33 (487.98) 91.01 (56.55) 13.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)17.68 mph (28.46 km/h)
25 mph (40.23 km/h)22.1 mph (35.57 km/h)
30 mph (48.28 km/h)26.52 mph (42.69 km/h)
35 mph (56.33 km/h)30.94 mph (49.8 km/h)
40 mph (64.37 km/h)35.36 mph (56.91 km/h)
45 mph (72.42 km/h)39.79 mph (64.03 km/h)
50 mph (80.47 km/h)44.21 mph (71.14 km/h)
55 mph (88.51 km/h)48.63 mph (78.26 km/h)
60 mph (96.56 km/h)53.05 mph (85.37 km/h)
65 mph (104.61 km/h)57.47 mph (92.49 km/h)
70 mph (112.65 km/h)61.89 mph (99.6 km/h)
75 mph (120.7 km/h)66.31 mph (106.71 km/h)
80 mph (128.75 km/h)70.73 mph (113.83 km/h)
85 mph (136.79 km/h)75.15 mph (120.94 km/h)
90 mph (144.84 km/h)79.57 mph (128.06 km/h)
95 mph (152.89 km/h)83.99 mph (135.17 km/h)
100 mph (160.93 km/h)88.41 mph (142.28 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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