Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
195/70r15 vs 225/70r15 Tire Comparison Side By Side
  195/70-15 225/70-15 Difference
Diameter inches (mm) 25.75 (654) 27.4 (696) 1.65 (42) 6.4%
Width inches (mm) 7.68 (195) 8.86 (225) 1.18 (30) 15.4%
Circum. inches (mm) 80.89 (2054.6) 86.08 (2186.55) 5.19 (131.95) 6.4%
Sidewall Height inches (mm) 5.37 (136.5) 6.2 (157.5) 0.83 (21) 15.4%
Revolutions per mile (km) 783.29 (486.71) 736.02 (457.34) -47.27 (-29.37) -6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.28 mph (34.25 km/h)
25 mph (40.23 km/h)26.61 mph (42.82 km/h)
30 mph (48.28 km/h)31.93 mph (51.38 km/h)
35 mph (56.33 km/h)37.25 mph (59.94 km/h)
40 mph (64.37 km/h)42.57 mph (68.51 km/h)
45 mph (72.42 km/h)47.89 mph (77.07 km/h)
50 mph (80.47 km/h)53.21 mph (85.63 km/h)
55 mph (88.51 km/h)58.53 mph (94.2 km/h)
60 mph (96.56 km/h)63.85 mph (102.76 km/h)
65 mph (104.61 km/h)69.17 mph (111.33 km/h)
70 mph (112.65 km/h)74.5 mph (119.89 km/h)
75 mph (120.7 km/h)79.82 mph (128.45 km/h)
80 mph (128.75 km/h)85.14 mph (137.02 km/h)
85 mph (136.79 km/h)90.46 mph (145.58 km/h)
90 mph (144.84 km/h)95.78 mph (154.14 km/h)
95 mph (152.89 km/h)101.1 mph (162.71 km/h)
100 mph (160.93 km/h)106.42 mph (171.27 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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