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 205/45r16 Tire Comparison Side By Side
  175/70-14 205/45-16 Difference
Diameter inches (mm) 23.65 (600.6) 23.26 (590.9) -0.38 (-9.7) -1.6%
Width inches (mm) 6.89 (175) 8.07 (205) 1.18 (30) 17.1%
Circum. inches (mm) 74.29 (1886.84) 73.09 (1856.37) -1.2 (-30.47) -1.6%
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) 866.93 (538.69) 14 (8.7) 1.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.68 mph (31.67 km/h)
25 mph (40.23 km/h)24.6 mph (39.58 km/h)
30 mph (48.28 km/h)29.52 mph (47.5 km/h)
35 mph (56.33 km/h)34.43 mph (55.42 km/h)
40 mph (64.37 km/h)39.35 mph (63.33 km/h)
45 mph (72.42 km/h)44.27 mph (71.25 km/h)
50 mph (80.47 km/h)49.19 mph (79.17 km/h)
55 mph (88.51 km/h)54.11 mph (87.08 km/h)
60 mph (96.56 km/h)59.03 mph (95 km/h)
65 mph (104.61 km/h)63.95 mph (102.92 km/h)
70 mph (112.65 km/h)68.87 mph (110.83 km/h)
75 mph (120.7 km/h)73.79 mph (118.75 km/h)
80 mph (128.75 km/h)78.71 mph (126.67 km/h)
85 mph (136.79 km/h)83.63 mph (134.59 km/h)
90 mph (144.84 km/h)88.55 mph (142.5 km/h)
95 mph (152.89 km/h)93.47 mph (150.42 km/h)
100 mph (160.93 km/h)98.38 mph (158.34 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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