Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/70r16 vs 285/75r16 Tire Comparison Side By Side
  245/70-16 285/75-16 Difference
Diameter inches (mm) 29.5 (749.4) 32.83 (833.9) 3.33 (84.5) 11.3%
Width inches (mm) 9.65 (245) 11.22 (285) 1.57 (40) 16.3%
Circum. inches (mm) 92.69 (2354.31) 103.14 (2619.77) 10.45 (265.46) 11.3%
Sidewall Height inches (mm) 6.75 (171.5) 8.42 (213.75) 1.66 (42.25) 24.6%
Revolutions per mile (km) 683.57 (424.75) 614.31 (381.71) -69.27 (-43.04) -10.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.26 mph (35.82 km/h)
25 mph (40.23 km/h)27.82 mph (44.77 km/h)
30 mph (48.28 km/h)33.38 mph (53.72 km/h)
35 mph (56.33 km/h)38.95 mph (62.68 km/h)
40 mph (64.37 km/h)44.51 mph (71.63 km/h)
45 mph (72.42 km/h)50.07 mph (80.59 km/h)
50 mph (80.47 km/h)55.64 mph (89.54 km/h)
55 mph (88.51 km/h)61.2 mph (98.49 km/h)
60 mph (96.56 km/h)66.77 mph (107.45 km/h)
65 mph (104.61 km/h)72.33 mph (116.4 km/h)
70 mph (112.65 km/h)77.89 mph (125.36 km/h)
75 mph (120.7 km/h)83.46 mph (134.31 km/h)
80 mph (128.75 km/h)89.02 mph (143.26 km/h)
85 mph (136.79 km/h)94.58 mph (152.22 km/h)
90 mph (144.84 km/h)100.15 mph (161.17 km/h)
95 mph (152.89 km/h)105.71 mph (170.13 km/h)
100 mph (160.93 km/h)111.28 mph (179.08 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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