Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/45r15 vs 215/50r15 Tire Comparison Side By Side
  225/45-15 215/50-15 Difference
Diameter inches (mm) 22.97 (583.5) 23.46 (596) 0.49 (12.5) 2.1%
Width inches (mm) 8.86 (225) 8.46 (215) -0.39 (-10) -4.4%
Circum. inches (mm) 72.17 (1833.12) 73.72 (1872.39) 1.55 (39.27) 2.1%
Sidewall Height inches (mm) 3.99 (101.25) 4.23 (107.5) 0.25 (6.25) 6.2%
Revolutions per mile (km) 877.93 (545.52) 859.51 (534.08) -18.41 (-11.44) -2.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.43 mph (32.88 km/h)
25 mph (40.23 km/h)25.54 mph (41.1 km/h)
30 mph (48.28 km/h)30.64 mph (49.31 km/h)
35 mph (56.33 km/h)35.75 mph (57.53 km/h)
40 mph (64.37 km/h)40.86 mph (65.75 km/h)
45 mph (72.42 km/h)45.96 mph (73.97 km/h)
50 mph (80.47 km/h)51.07 mph (82.19 km/h)
55 mph (88.51 km/h)56.18 mph (90.41 km/h)
60 mph (96.56 km/h)61.29 mph (98.63 km/h)
65 mph (104.61 km/h)66.39 mph (106.85 km/h)
70 mph (112.65 km/h)71.5 mph (115.07 km/h)
75 mph (120.7 km/h)76.61 mph (123.29 km/h)
80 mph (128.75 km/h)81.71 mph (131.51 km/h)
85 mph (136.79 km/h)86.82 mph (139.72 km/h)
90 mph (144.84 km/h)91.93 mph (147.94 km/h)
95 mph (152.89 km/h)97.04 mph (156.16 km/h)
100 mph (160.93 km/h)102.14 mph (164.38 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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