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 205/50r17 Tire Comparison Side By Side
  205/40-17 205/50-17 Difference
Diameter inches (mm) 23.46 (595.8) 25.07 (636.8) 1.61 (41) 6.9%
Width inches (mm) 8.07 (205) 8.07 (205) 0 (0) 0%
Circum. inches (mm) 73.69 (1871.76) 78.76 (2000.57) 5.07 (128.81) 6.9%
Sidewall Height inches (mm) 3.23 (82) 4.04 (102.5) 0.81 (20.5) 25%
Revolutions per mile (km) 859.8 (534.26) 804.44 (499.86) -55.36 (-34.4) -6.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.38 mph (34.4 km/h)
25 mph (40.23 km/h)26.72 mph (43 km/h)
30 mph (48.28 km/h)32.06 mph (51.6 km/h)
35 mph (56.33 km/h)37.41 mph (60.2 km/h)
40 mph (64.37 km/h)42.75 mph (68.8 km/h)
45 mph (72.42 km/h)48.1 mph (77.4 km/h)
50 mph (80.47 km/h)53.44 mph (86 km/h)
55 mph (88.51 km/h)58.78 mph (94.61 km/h)
60 mph (96.56 km/h)64.13 mph (103.21 km/h)
65 mph (104.61 km/h)69.47 mph (111.81 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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