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 215/65r15 Tire Comparison Side By Side
  225/70-15 215/65-15 Difference
Diameter inches (mm) 27.4 (696) 26 (660.5) -1.4 (-35.5) -5.1%
Width inches (mm) 8.86 (225) 8.46 (215) -0.39 (-10) -4.4%
Circum. inches (mm) 86.08 (2186.55) 81.69 (2075.02) -4.39 (-111.53) -5.1%
Sidewall Height inches (mm) 6.2 (157.5) 5.5 (139.75) -0.7 (-17.75) -11.3%
Revolutions per mile (km) 736.02 (457.34) 775.58 (481.92) 39.56 (24.58) 5.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.98 mph (30.55 km/h)
25 mph (40.23 km/h)23.72 mph (38.18 km/h)
30 mph (48.28 km/h)28.47 mph (45.82 km/h)
35 mph (56.33 km/h)33.21 mph (53.45 km/h)
40 mph (64.37 km/h)37.96 mph (61.09 km/h)
45 mph (72.42 km/h)42.7 mph (68.73 km/h)
50 mph (80.47 km/h)47.45 mph (76.36 km/h)
55 mph (88.51 km/h)52.19 mph (84 km/h)
60 mph (96.56 km/h)56.94 mph (91.64 km/h)
65 mph (104.61 km/h)61.68 mph (99.27 km/h)
70 mph (112.65 km/h)66.43 mph (106.91 km/h)
75 mph (120.7 km/h)71.17 mph (114.54 km/h)
80 mph (128.75 km/h)75.92 mph (122.18 km/h)
85 mph (136.79 km/h)80.66 mph (129.82 km/h)
90 mph (144.84 km/h)85.41 mph (137.45 km/h)
95 mph (152.89 km/h)90.15 mph (145.09 km/h)
100 mph (160.93 km/h)94.9 mph (152.73 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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