Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
205/45r17 vs 215/40r17 Tire Comparison Side By Side
  205/45-17 215/40-17 Difference
Diameter inches (mm) 24.26 (616.3) 23.77 (603.8) -0.49 (-12.5) -2%
Width inches (mm) 8.07 (205) 8.46 (215) 0.39 (10) 4.9%
Circum. inches (mm) 76.23 (1936.16) 74.68 (1896.89) -1.55 (-39.27) -2%
Sidewall Height inches (mm) 3.63 (92.25) 3.39 (86) -0.25 (-6.25) -6.8%
Revolutions per mile (km) 831.2 (516.48) 848.41 (527.18) 17.21 (10.69) 2.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.59 mph (31.53 km/h)
25 mph (40.23 km/h)24.49 mph (39.42 km/h)
30 mph (48.28 km/h)29.39 mph (47.3 km/h)
35 mph (56.33 km/h)34.29 mph (55.18 km/h)
40 mph (64.37 km/h)39.19 mph (63.07 km/h)
45 mph (72.42 km/h)44.09 mph (70.95 km/h)
50 mph (80.47 km/h)48.99 mph (78.84 km/h)
55 mph (88.51 km/h)53.88 mph (86.72 km/h)
60 mph (96.56 km/h)58.78 mph (94.6 km/h)
65 mph (104.61 km/h)63.68 mph (102.49 km/h)
70 mph (112.65 km/h)68.58 mph (110.37 km/h)
75 mph (120.7 km/h)73.48 mph (118.25 km/h)
80 mph (128.75 km/h)78.38 mph (126.14 km/h)
85 mph (136.79 km/h)83.28 mph (134.02 km/h)
90 mph (144.84 km/h)88.17 mph (141.9 km/h)
95 mph (152.89 km/h)93.07 mph (149.79 km/h)
100 mph (160.93 km/h)97.97 mph (157.67 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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