Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
185/55r15 vs 195/55r15 Tire Comparison Side By Side
  185/55-15 195/55-15 Difference
Diameter inches (mm) 23.01 (584.5) 23.44 (595.5) 0.43 (11) 1.9%
Width inches (mm) 7.28 (185) 7.68 (195) 0.39 (10) 5.4%
Circum. inches (mm) 72.29 (1836.26) 73.65 (1870.82) 1.36 (34.56) 1.9%
Sidewall Height inches (mm) 4.01 (101.75) 4.22 (107.25) 0.22 (5.5) 5.4%
Revolutions per mile (km) 876.42 (544.58) 860.24 (534.52) -16.19 (-10.06) -1.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.38 mph (32.79 km/h)
25 mph (40.23 km/h)25.47 mph (40.99 km/h)
30 mph (48.28 km/h)30.56 mph (49.19 km/h)
35 mph (56.33 km/h)35.66 mph (57.39 km/h)
40 mph (64.37 km/h)40.75 mph (65.59 km/h)
45 mph (72.42 km/h)45.85 mph (73.78 km/h)
50 mph (80.47 km/h)50.94 mph (81.98 km/h)
55 mph (88.51 km/h)56.04 mph (90.18 km/h)
60 mph (96.56 km/h)61.13 mph (98.38 km/h)
65 mph (104.61 km/h)66.22 mph (106.58 km/h)
70 mph (112.65 km/h)71.32 mph (114.77 km/h)
75 mph (120.7 km/h)76.41 mph (122.97 km/h)
80 mph (128.75 km/h)81.51 mph (131.17 km/h)
85 mph (136.79 km/h)86.6 mph (139.37 km/h)
90 mph (144.84 km/h)91.69 mph (147.57 km/h)
95 mph (152.89 km/h)96.79 mph (155.77 km/h)
100 mph (160.93 km/h)101.88 mph (163.96 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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