Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
205/80r17 vs 225/70r15 Tire Comparison Side By Side
  205/80-17 225/70-15 Difference
Diameter inches (mm) 29.91 (759.8) 27.4 (696) -2.51 (-63.8) -8.4%
Width inches (mm) 8.07 (205) 8.86 (225) 0.79 (20) 9.8%
Circum. inches (mm) 93.98 (2386.98) 86.08 (2186.55) -7.89 (-200.43) -8.4%
Sidewall Height inches (mm) 6.46 (164) 6.2 (157.5) -0.26 (-6.5) -4%
Revolutions per mile (km) 674.22 (418.94) 736.02 (457.34) 61.8 (38.4) 9.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.32 mph (29.48 km/h)
25 mph (40.23 km/h)22.9 mph (36.86 km/h)
30 mph (48.28 km/h)27.48 mph (44.23 km/h)
35 mph (56.33 km/h)32.06 mph (51.6 km/h)
40 mph (64.37 km/h)36.64 mph (58.97 km/h)
45 mph (72.42 km/h)41.22 mph (66.34 km/h)
50 mph (80.47 km/h)45.8 mph (73.71 km/h)
55 mph (88.51 km/h)50.38 mph (81.08 km/h)
60 mph (96.56 km/h)54.96 mph (88.45 km/h)
65 mph (104.61 km/h)59.54 mph (95.82 km/h)
70 mph (112.65 km/h)64.12 mph (103.19 km/h)
75 mph (120.7 km/h)68.7 mph (110.57 km/h)
80 mph (128.75 km/h)73.28 mph (117.94 km/h)
85 mph (136.79 km/h)77.86 mph (125.31 km/h)
90 mph (144.84 km/h)82.44 mph (132.68 km/h)
95 mph (152.89 km/h)87.02 mph (140.05 km/h)
100 mph (160.93 km/h)91.6 mph (147.42 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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