Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
205/40r17 vs 225/45r17 Tire Comparison Side By Side
  205/40-17 225/45-17 Difference
Diameter inches (mm) 23.46 (595.8) 24.97 (634.3) 1.52 (38.5) 6.5%
Width inches (mm) 8.07 (205) 8.86 (225) 0.79 (20) 9.8%
Circum. inches (mm) 73.69 (1871.76) 78.45 (1992.71) 4.76 (120.95) 6.5%
Sidewall Height inches (mm) 3.23 (82) 3.99 (101.25) 0.76 (19.25) 23.5%
Revolutions per mile (km) 859.8 (534.26) 807.61 (501.83) -52.19 (-32.43) -6.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.29 mph (34.27 km/h)
25 mph (40.23 km/h)26.62 mph (42.83 km/h)
30 mph (48.28 km/h)31.94 mph (51.4 km/h)
35 mph (56.33 km/h)37.26 mph (59.97 km/h)
40 mph (64.37 km/h)42.58 mph (68.53 km/h)
45 mph (72.42 km/h)47.91 mph (77.1 km/h)
50 mph (80.47 km/h)53.23 mph (85.67 km/h)
55 mph (88.51 km/h)58.55 mph (94.23 km/h)
60 mph (96.56 km/h)63.88 mph (102.8 km/h)
65 mph (104.61 km/h)69.2 mph (111.37 km/h)
70 mph (112.65 km/h)74.52 mph (119.93 km/h)
75 mph (120.7 km/h)79.85 mph (128.5 km/h)
80 mph (128.75 km/h)85.17 mph (137.07 km/h)
85 mph (136.79 km/h)90.49 mph (145.63 km/h)
90 mph (144.84 km/h)95.82 mph (154.2 km/h)
95 mph (152.89 km/h)101.14 mph (162.77 km/h)
100 mph (160.93 km/h)106.46 mph (171.33 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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