Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
175/70r14 vs 205/45r17 Tire Comparison Side By Side
  175/70-14 205/45-17 Difference
Diameter inches (mm) 23.65 (600.6) 24.26 (616.3) 0.62 (15.7) 2.6%
Width inches (mm) 6.89 (175) 8.07 (205) 1.18 (30) 17.1%
Circum. inches (mm) 74.29 (1886.84) 76.23 (1936.16) 1.94 (49.32) 2.6%
Sidewall Height inches (mm) 4.82 (122.5) 3.63 (92.25) -1.19 (-30.25) -24.7%
Revolutions per mile (km) 852.93 (529.99) 831.2 (516.48) -21.73 (-13.5) -2.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.52 mph (33.03 km/h)
25 mph (40.23 km/h)25.65 mph (41.29 km/h)
30 mph (48.28 km/h)30.78 mph (49.54 km/h)
35 mph (56.33 km/h)35.91 mph (57.8 km/h)
40 mph (64.37 km/h)41.05 mph (66.06 km/h)
45 mph (72.42 km/h)46.18 mph (74.31 km/h)
50 mph (80.47 km/h)51.31 mph (82.57 km/h)
55 mph (88.51 km/h)56.44 mph (90.83 km/h)
60 mph (96.56 km/h)61.57 mph (99.08 km/h)
65 mph (104.61 km/h)66.7 mph (107.34 km/h)
70 mph (112.65 km/h)71.83 mph (115.6 km/h)
75 mph (120.7 km/h)76.96 mph (123.86 km/h)
80 mph (128.75 km/h)82.09 mph (132.11 km/h)
85 mph (136.79 km/h)87.22 mph (140.37 km/h)
90 mph (144.84 km/h)92.35 mph (148.63 km/h)
95 mph (152.89 km/h)97.48 mph (156.88 km/h)
100 mph (160.93 km/h)102.61 mph (165.14 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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