Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/70r17 vs 285/70r17 Tire Comparison Side By Side
  245/70-17 285/70-17 Difference
Diameter inches (mm) 30.5 (774.8) 32.71 (830.8) 2.2 (56) 7.2%
Width inches (mm) 9.65 (245) 11.22 (285) 1.57 (40) 16.3%
Circum. inches (mm) 95.83 (2434.11) 102.76 (2610.04) 6.93 (175.93) 7.2%
Sidewall Height inches (mm) 6.75 (171.5) 7.85 (199.5) 1.1 (28) 16.3%
Revolutions per mile (km) 661.16 (410.83) 616.6 (383.14) -44.57 (-27.69) -6.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.45 mph (34.51 km/h)
25 mph (40.23 km/h)26.81 mph (43.14 km/h)
30 mph (48.28 km/h)32.17 mph (51.77 km/h)
35 mph (56.33 km/h)37.53 mph (60.4 km/h)
40 mph (64.37 km/h)42.89 mph (69.03 km/h)
45 mph (72.42 km/h)48.25 mph (77.65 km/h)
50 mph (80.47 km/h)53.61 mph (86.28 km/h)
55 mph (88.51 km/h)58.98 mph (94.91 km/h)
60 mph (96.56 km/h)64.34 mph (103.54 km/h)
65 mph (104.61 km/h)69.7 mph (112.17 km/h)
70 mph (112.65 km/h)75.06 mph (120.8 km/h)
75 mph (120.7 km/h)80.42 mph (129.42 km/h)
80 mph (128.75 km/h)85.78 mph (138.05 km/h)
85 mph (136.79 km/h)91.14 mph (146.68 km/h)
90 mph (144.84 km/h)96.5 mph (155.31 km/h)
95 mph (152.89 km/h)101.87 mph (163.94 km/h)
100 mph (160.93 km/h)107.23 mph (172.57 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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