Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
195/55r15 vs 185/50r15 Tire Comparison Side By Side
  195/55-15 185/50-15 Difference
Diameter inches (mm) 23.44 (595.5) 22.28 (566) -1.16 (-29.5) -5%
Width inches (mm) 7.68 (195) 7.28 (185) -0.39 (-10) -5.1%
Circum. inches (mm) 73.65 (1870.82) 70.01 (1778.14) -3.65 (-92.68) -5%
Sidewall Height inches (mm) 4.22 (107.25) 3.64 (92.5) -0.58 (-14.75) -13.8%
Revolutions per mile (km) 860.24 (534.52) 905.07 (562.38) 44.84 (27.86) 5.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.01 mph (30.59 km/h)
25 mph (40.23 km/h)23.76 mph (38.24 km/h)
30 mph (48.28 km/h)28.51 mph (45.89 km/h)
35 mph (56.33 km/h)33.27 mph (53.54 km/h)
40 mph (64.37 km/h)38.02 mph (61.18 km/h)
45 mph (72.42 km/h)42.77 mph (68.83 km/h)
50 mph (80.47 km/h)47.52 mph (76.48 km/h)
55 mph (88.51 km/h)52.28 mph (84.13 km/h)
60 mph (96.56 km/h)57.03 mph (91.78 km/h)
65 mph (104.61 km/h)61.78 mph (99.43 km/h)
70 mph (112.65 km/h)66.53 mph (107.07 km/h)
75 mph (120.7 km/h)71.28 mph (114.72 km/h)
80 mph (128.75 km/h)76.04 mph (122.37 km/h)
85 mph (136.79 km/h)80.79 mph (130.02 km/h)
90 mph (144.84 km/h)85.54 mph (137.67 km/h)
95 mph (152.89 km/h)90.29 mph (145.31 km/h)
100 mph (160.93 km/h)95.05 mph (152.96 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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