Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
125/70r17 vs 225/45r17 Tire Comparison Side By Side
  125/70-17 225/45-17 Difference
Diameter inches (mm) 23.89 (606.8) 24.97 (634.3) 1.08 (27.5) 4.5%
Width inches (mm) 4.92 (125) 8.86 (225) 3.94 (100) 80%
Circum. inches (mm) 75.05 (1906.32) 78.45 (1992.71) 3.4 (86.39) 4.5%
Sidewall Height inches (mm) 3.44 (87.5) 3.99 (101.25) 0.54 (13.75) 15.7%
Revolutions per mile (km) 844.22 (524.57) 807.61 (501.83) -36.6 (-22.74) -4.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.91 mph (33.65 km/h)
25 mph (40.23 km/h)26.13 mph (42.06 km/h)
30 mph (48.28 km/h)31.36 mph (50.47 km/h)
35 mph (56.33 km/h)36.59 mph (58.88 km/h)
40 mph (64.37 km/h)41.81 mph (67.29 km/h)
45 mph (72.42 km/h)47.04 mph (75.7 km/h)
50 mph (80.47 km/h)52.27 mph (84.11 km/h)
55 mph (88.51 km/h)57.49 mph (92.53 km/h)
60 mph (96.56 km/h)62.72 mph (100.94 km/h)
65 mph (104.61 km/h)67.95 mph (109.35 km/h)
70 mph (112.65 km/h)73.17 mph (117.76 km/h)
75 mph (120.7 km/h)78.4 mph (126.17 km/h)
80 mph (128.75 km/h)83.63 mph (134.58 km/h)
85 mph (136.79 km/h)88.85 mph (142.99 km/h)
90 mph (144.84 km/h)94.08 mph (151.41 km/h)
95 mph (152.89 km/h)99.31 mph (159.82 km/h)
100 mph (160.93 km/h)104.53 mph (168.23 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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