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 215/70r15 Tire Comparison Side By Side
  225/70-15 215/70-15 Difference
Diameter inches (mm) 27.4 (696) 26.85 (682) -0.55 (-14) -2%
Width inches (mm) 8.86 (225) 8.46 (215) -0.39 (-10) -4.4%
Circum. inches (mm) 86.08 (2186.55) 84.35 (2142.57) -1.73 (-43.98) -2%
Sidewall Height inches (mm) 6.2 (157.5) 5.93 (150.5) -0.28 (-7) -4.4%
Revolutions per mile (km) 736.02 (457.34) 751.13 (466.73) 15.11 (9.39) 2.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.6 mph (31.54 km/h)
25 mph (40.23 km/h)24.5 mph (39.42 km/h)
30 mph (48.28 km/h)29.4 mph (47.31 km/h)
35 mph (56.33 km/h)34.3 mph (55.19 km/h)
40 mph (64.37 km/h)39.2 mph (63.08 km/h)
45 mph (72.42 km/h)44.09 mph (70.96 km/h)
50 mph (80.47 km/h)48.99 mph (78.85 km/h)
55 mph (88.51 km/h)53.89 mph (86.73 km/h)
60 mph (96.56 km/h)58.79 mph (94.62 km/h)
65 mph (104.61 km/h)63.69 mph (102.5 km/h)
70 mph (112.65 km/h)68.59 mph (110.39 km/h)
75 mph (120.7 km/h)73.49 mph (118.27 km/h)
80 mph (128.75 km/h)78.39 mph (126.16 km/h)
85 mph (136.79 km/h)83.29 mph (134.04 km/h)
90 mph (144.84 km/h)88.19 mph (141.93 km/h)
95 mph (152.89 km/h)93.09 mph (149.81 km/h)
100 mph (160.93 km/h)97.99 mph (157.7 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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