Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
175/55r17 vs 185/50r17 Tire Comparison Side By Side
  175/55-17 185/50-17 Difference
Diameter inches (mm) 24.58 (624.3) 24.28 (616.8) -0.3 (-7.5) -1.2%
Width inches (mm) 6.89 (175) 7.28 (185) 0.39 (10) 5.7%
Circum. inches (mm) 77.22 (1961.3) 76.29 (1937.73) -0.93 (-23.56) -1.2%
Sidewall Height inches (mm) 3.79 (96.25) 3.64 (92.5) -0.15 (-3.75) -3.9%
Revolutions per mile (km) 820.55 (509.87) 830.53 (516.07) 9.98 (6.2) 1.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.76 mph (31.8 km/h)
25 mph (40.23 km/h)24.7 mph (39.75 km/h)
30 mph (48.28 km/h)29.64 mph (47.7 km/h)
35 mph (56.33 km/h)34.58 mph (55.65 km/h)
40 mph (64.37 km/h)39.52 mph (63.6 km/h)
45 mph (72.42 km/h)44.46 mph (71.55 km/h)
50 mph (80.47 km/h)49.4 mph (79.5 km/h)
55 mph (88.51 km/h)54.34 mph (87.45 km/h)
60 mph (96.56 km/h)59.28 mph (95.4 km/h)
65 mph (104.61 km/h)64.22 mph (103.35 km/h)
70 mph (112.65 km/h)69.16 mph (111.3 km/h)
75 mph (120.7 km/h)74.1 mph (119.25 km/h)
80 mph (128.75 km/h)79.04 mph (127.2 km/h)
85 mph (136.79 km/h)83.98 mph (135.15 km/h)
90 mph (144.84 km/h)88.92 mph (143.1 km/h)
95 mph (152.89 km/h)93.86 mph (151.05 km/h)
100 mph (160.93 km/h)98.8 mph (159 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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