Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/70r15 vs 225/75r15 Tire Comparison Side By Side
  225/70-15 225/75-15 Difference
Diameter inches (mm) 27.4 (696) 28.29 (718.5) 0.89 (22.5) 3.2%
Width inches (mm) 8.86 (225) 8.86 (225) 0 (0) 0%
Circum. inches (mm) 86.08 (2186.55) 88.87 (2257.23) 2.78 (70.69) 3.2%
Sidewall Height inches (mm) 6.2 (157.5) 6.64 (168.75) 0.44 (11.25) 7.1%
Revolutions per mile (km) 736.02 (457.34) 712.97 (443.02) -23.05 (-14.32) -3.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.65 mph (33.23 km/h)
25 mph (40.23 km/h)25.81 mph (41.53 km/h)
30 mph (48.28 km/h)30.97 mph (49.84 km/h)
35 mph (56.33 km/h)36.13 mph (58.15 km/h)
40 mph (64.37 km/h)41.29 mph (66.45 km/h)
45 mph (72.42 km/h)46.45 mph (74.76 km/h)
50 mph (80.47 km/h)51.62 mph (83.07 km/h)
55 mph (88.51 km/h)56.78 mph (91.38 km/h)
60 mph (96.56 km/h)61.94 mph (99.68 km/h)
65 mph (104.61 km/h)67.1 mph (107.99 km/h)
70 mph (112.65 km/h)72.26 mph (116.3 km/h)
75 mph (120.7 km/h)77.42 mph (124.6 km/h)
80 mph (128.75 km/h)82.59 mph (132.91 km/h)
85 mph (136.79 km/h)87.75 mph (141.22 km/h)
90 mph (144.84 km/h)92.91 mph (149.52 km/h)
95 mph (152.89 km/h)98.07 mph (157.83 km/h)
100 mph (160.93 km/h)103.23 mph (166.14 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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