Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/45r17 vs 225/50r17 Tire Comparison Side By Side
  245/45-17 225/50-17 Difference
Diameter inches (mm) 25.68 (652.3) 25.86 (656.8) 0.18 (4.5) 0.7%
Width inches (mm) 9.65 (245) 8.86 (225) -0.79 (-20) -8.2%
Circum. inches (mm) 80.68 (2049.26) 81.24 (2063.4) 0.56 (14.14) 0.7%
Sidewall Height inches (mm) 4.34 (110.25) 4.43 (112.5) 0.09 (2.25) 2%
Revolutions per mile (km) 785.33 (487.98) 779.95 (484.64) -5.38 (-3.34) -0.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.14 mph (32.41 km/h)
25 mph (40.23 km/h)25.17 mph (40.51 km/h)
30 mph (48.28 km/h)30.21 mph (48.61 km/h)
35 mph (56.33 km/h)35.24 mph (56.72 km/h)
40 mph (64.37 km/h)40.28 mph (64.82 km/h)
45 mph (72.42 km/h)45.31 mph (72.92 km/h)
50 mph (80.47 km/h)50.34 mph (81.02 km/h)
55 mph (88.51 km/h)55.38 mph (89.12 km/h)
60 mph (96.56 km/h)60.41 mph (97.23 km/h)
65 mph (104.61 km/h)65.45 mph (105.33 km/h)
70 mph (112.65 km/h)70.48 mph (113.43 km/h)
75 mph (120.7 km/h)75.52 mph (121.53 km/h)
80 mph (128.75 km/h)80.55 mph (129.64 km/h)
85 mph (136.79 km/h)85.59 mph (137.74 km/h)
90 mph (144.84 km/h)90.62 mph (145.84 km/h)
95 mph (152.89 km/h)95.66 mph (153.94 km/h)
100 mph (160.93 km/h)100.69 mph (162.04 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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