Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/65r17 vs 245/70r17 Tire Comparison Side By Side
  225/65-17 245/70-17 Difference
Diameter inches (mm) 28.52 (724.3) 30.5 (774.8) 1.99 (50.5) 7%
Width inches (mm) 8.86 (225) 9.65 (245) 0.79 (20) 8.9%
Circum. inches (mm) 89.58 (2275.46) 95.83 (2434.11) 6.25 (158.65) 7%
Sidewall Height inches (mm) 5.76 (146.25) 6.75 (171.5) 0.99 (25.25) 17.3%
Revolutions per mile (km) 707.26 (439.47) 661.16 (410.83) -46.1 (-28.64) -6.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.39 mph (34.43 km/h)
25 mph (40.23 km/h)26.74 mph (43.04 km/h)
30 mph (48.28 km/h)32.09 mph (51.65 km/h)
35 mph (56.33 km/h)37.44 mph (60.25 km/h)
40 mph (64.37 km/h)42.79 mph (68.86 km/h)
45 mph (72.42 km/h)48.14 mph (77.47 km/h)
50 mph (80.47 km/h)53.49 mph (86.08 km/h)
55 mph (88.51 km/h)58.83 mph (94.69 km/h)
60 mph (96.56 km/h)64.18 mph (103.29 km/h)
65 mph (104.61 km/h)69.53 mph (111.9 km/h)
70 mph (112.65 km/h)74.88 mph (120.51 km/h)
75 mph (120.7 km/h)80.23 mph (129.12 km/h)
80 mph (128.75 km/h)85.58 mph (137.72 km/h)
85 mph (136.79 km/h)90.93 mph (146.33 km/h)
90 mph (144.84 km/h)96.28 mph (154.94 km/h)
95 mph (152.89 km/h)101.62 mph (163.55 km/h)
100 mph (160.93 km/h)106.97 mph (172.16 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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