Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/75r15 vs 225/75r15 Tire Comparison Side By Side
  255/75-15 225/75-15 Difference
Diameter inches (mm) 30.06 (763.5) 28.29 (718.5) -1.77 (-45) -5.9%
Width inches (mm) 10.04 (255) 8.86 (225) -1.18 (-30) -11.8%
Circum. inches (mm) 94.43 (2398.61) 88.87 (2257.23) -5.57 (-141.37) -5.9%
Sidewall Height inches (mm) 7.53 (191.25) 6.64 (168.75) -0.89 (-22.5) -11.8%
Revolutions per mile (km) 670.95 (416.91) 712.97 (443.02) 42.02 (26.11) 6.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.82 mph (30.29 km/h)
25 mph (40.23 km/h)23.53 mph (37.86 km/h)
30 mph (48.28 km/h)28.23 mph (45.43 km/h)
35 mph (56.33 km/h)32.94 mph (53.01 km/h)
40 mph (64.37 km/h)37.64 mph (60.58 km/h)
45 mph (72.42 km/h)42.35 mph (68.15 km/h)
50 mph (80.47 km/h)47.05 mph (75.72 km/h)
55 mph (88.51 km/h)51.76 mph (83.3 km/h)
60 mph (96.56 km/h)56.46 mph (90.87 km/h)
65 mph (104.61 km/h)61.17 mph (98.44 km/h)
70 mph (112.65 km/h)65.87 mph (106.01 km/h)
75 mph (120.7 km/h)70.58 mph (113.59 km/h)
80 mph (128.75 km/h)75.28 mph (121.16 km/h)
85 mph (136.79 km/h)79.99 mph (128.73 km/h)
90 mph (144.84 km/h)84.7 mph (136.3 km/h)
95 mph (152.89 km/h)89.4 mph (143.88 km/h)
100 mph (160.93 km/h)94.11 mph (151.45 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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