Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/60r15 vs 225/55r15 Tire Comparison Side By Side
  215/60-15 225/55-15 Difference
Diameter inches (mm) 25.16 (639) 24.74 (628.5) -0.41 (-10.5) -1.6%
Width inches (mm) 8.46 (215) 8.86 (225) 0.39 (10) 4.7%
Circum. inches (mm) 79.03 (2007.48) 77.74 (1974.49) -1.3 (-32.99) -1.6%
Sidewall Height inches (mm) 5.08 (129) 4.87 (123.75) -0.21 (-5.25) -4.1%
Revolutions per mile (km) 801.67 (498.14) 815.07 (506.46) 13.39 (8.32) 1.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.67 mph (31.66 km/h)
25 mph (40.23 km/h)24.59 mph (39.57 km/h)
30 mph (48.28 km/h)29.51 mph (47.49 km/h)
35 mph (56.33 km/h)34.42 mph (55.4 km/h)
40 mph (64.37 km/h)39.34 mph (63.32 km/h)
45 mph (72.42 km/h)44.26 mph (71.23 km/h)
50 mph (80.47 km/h)49.18 mph (79.15 km/h)
55 mph (88.51 km/h)54.1 mph (87.06 km/h)
60 mph (96.56 km/h)59.01 mph (94.97 km/h)
65 mph (104.61 km/h)63.93 mph (102.89 km/h)
70 mph (112.65 km/h)68.85 mph (110.8 km/h)
75 mph (120.7 km/h)73.77 mph (118.72 km/h)
80 mph (128.75 km/h)78.69 mph (126.63 km/h)
85 mph (136.79 km/h)83.6 mph (134.55 km/h)
90 mph (144.84 km/h)88.52 mph (142.46 km/h)
95 mph (152.89 km/h)93.44 mph (150.38 km/h)
100 mph (160.93 km/h)98.36 mph (158.29 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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