Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/75r16 vs 225/70r15 Tire Comparison Side By Side
  225/75-16 225/70-15 Difference
Diameter inches (mm) 29.29 (743.9) 27.4 (696) -1.89 (-47.9) -6.4%
Width inches (mm) 8.86 (225) 8.86 (225) 0 (0) 0%
Circum. inches (mm) 92.01 (2337.03) 86.08 (2186.55) -5.92 (-150.48) -6.4%
Sidewall Height inches (mm) 6.64 (168.75) 6.2 (157.5) -0.44 (-11.25) -6.7%
Revolutions per mile (km) 688.63 (427.89) 736.02 (457.34) 47.39 (29.45) 6.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.71 mph (30.11 km/h)
25 mph (40.23 km/h)23.39 mph (37.64 km/h)
30 mph (48.28 km/h)28.07 mph (45.17 km/h)
35 mph (56.33 km/h)32.75 mph (52.7 km/h)
40 mph (64.37 km/h)37.42 mph (60.23 km/h)
45 mph (72.42 km/h)42.1 mph (67.76 km/h)
50 mph (80.47 km/h)46.78 mph (75.29 km/h)
55 mph (88.51 km/h)51.46 mph (82.81 km/h)
60 mph (96.56 km/h)56.14 mph (90.34 km/h)
65 mph (104.61 km/h)60.81 mph (97.87 km/h)
70 mph (112.65 km/h)65.49 mph (105.4 km/h)
75 mph (120.7 km/h)70.17 mph (112.93 km/h)
80 mph (128.75 km/h)74.85 mph (120.46 km/h)
85 mph (136.79 km/h)79.53 mph (127.99 km/h)
90 mph (144.84 km/h)84.2 mph (135.51 km/h)
95 mph (152.89 km/h)88.88 mph (143.04 km/h)
100 mph (160.93 km/h)93.56 mph (150.57 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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