Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
195/75r15 vs 225/75r15 Tire Comparison Side By Side
  195/75-15 225/75-15 Difference
Diameter inches (mm) 26.52 (673.5) 28.29 (718.5) 1.77 (45) 6.7%
Width inches (mm) 7.68 (195) 8.86 (225) 1.18 (30) 15.4%
Circum. inches (mm) 83.3 (2115.86) 88.87 (2257.23) 5.57 (141.37) 6.7%
Sidewall Height inches (mm) 5.76 (146.25) 6.64 (168.75) 0.89 (22.5) 15.4%
Revolutions per mile (km) 760.61 (472.62) 712.97 (443.02) -47.64 (-29.6) -6.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.34 mph (34.34 km/h)
25 mph (40.23 km/h)26.67 mph (42.92 km/h)
30 mph (48.28 km/h)32 mph (51.51 km/h)
35 mph (56.33 km/h)37.34 mph (60.09 km/h)
40 mph (64.37 km/h)42.67 mph (68.68 km/h)
45 mph (72.42 km/h)48.01 mph (77.26 km/h)
50 mph (80.47 km/h)53.34 mph (85.84 km/h)
55 mph (88.51 km/h)58.67 mph (94.43 km/h)
60 mph (96.56 km/h)64.01 mph (103.01 km/h)
65 mph (104.61 km/h)69.34 mph (111.6 km/h)
70 mph (112.65 km/h)74.68 mph (120.18 km/h)
75 mph (120.7 km/h)80.01 mph (128.77 km/h)
80 mph (128.75 km/h)85.35 mph (137.35 km/h)
85 mph (136.79 km/h)90.68 mph (145.93 km/h)
90 mph (144.84 km/h)96.01 mph (154.52 km/h)
95 mph (152.89 km/h)101.35 mph (163.1 km/h)
100 mph (160.93 km/h)106.68 mph (171.69 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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