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 245/65r17 Tire Comparison Side By Side
  225/65-17 245/65-17 Difference
Diameter inches (mm) 28.52 (724.3) 29.54 (750.3) 1.02 (26) 3.6%
Width inches (mm) 8.86 (225) 9.65 (245) 0.79 (20) 8.9%
Circum. inches (mm) 89.58 (2275.46) 92.8 (2357.14) 3.22 (81.68) 3.6%
Sidewall Height inches (mm) 5.76 (146.25) 6.27 (159.25) 0.51 (13) 8.9%
Revolutions per mile (km) 707.26 (439.47) 682.75 (424.24) -24.51 (-15.23) -3.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.72 mph (33.34 km/h)
25 mph (40.23 km/h)25.9 mph (41.68 km/h)
30 mph (48.28 km/h)31.08 mph (50.01 km/h)
35 mph (56.33 km/h)36.26 mph (58.35 km/h)
40 mph (64.37 km/h)41.44 mph (66.68 km/h)
45 mph (72.42 km/h)46.62 mph (75.02 km/h)
50 mph (80.47 km/h)51.79 mph (83.36 km/h)
55 mph (88.51 km/h)56.97 mph (91.69 km/h)
60 mph (96.56 km/h)62.15 mph (100.03 km/h)
65 mph (104.61 km/h)67.33 mph (108.36 km/h)
70 mph (112.65 km/h)72.51 mph (116.7 km/h)
75 mph (120.7 km/h)77.69 mph (125.03 km/h)
80 mph (128.75 km/h)82.87 mph (133.37 km/h)
85 mph (136.79 km/h)88.05 mph (141.7 km/h)
90 mph (144.84 km/h)93.23 mph (150.04 km/h)
95 mph (152.89 km/h)98.41 mph (158.38 km/h)
100 mph (160.93 km/h)103.59 mph (166.71 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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