Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
220/70r14 vs 215/60r15 Tire Comparison Side By Side
  220/70-14 215/60-15 Difference
Diameter inches (mm) 26.13 (663.6) 25.16 (639) -0.97 (-24.6) -3.7%
Width inches (mm) 8.66 (220) 8.46 (215) -0.2 (-5) -2.3%
Circum. inches (mm) 82.08 (2084.76) 79.03 (2007.48) -3.04 (-77.28) -3.7%
Sidewall Height inches (mm) 6.06 (154) 5.08 (129) -0.98 (-25) -16.2%
Revolutions per mile (km) 771.96 (479.67) 801.67 (498.14) 29.72 (18.47) 3.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.26 mph (30.99 km/h)
25 mph (40.23 km/h)24.07 mph (38.74 km/h)
30 mph (48.28 km/h)28.89 mph (46.49 km/h)
35 mph (56.33 km/h)33.7 mph (54.24 km/h)
40 mph (64.37 km/h)38.52 mph (61.99 km/h)
45 mph (72.42 km/h)43.33 mph (69.74 km/h)
50 mph (80.47 km/h)48.15 mph (77.48 km/h)
55 mph (88.51 km/h)52.96 mph (85.23 km/h)
60 mph (96.56 km/h)57.78 mph (92.98 km/h)
65 mph (104.61 km/h)62.59 mph (100.73 km/h)
70 mph (112.65 km/h)67.41 mph (108.48 km/h)
75 mph (120.7 km/h)72.22 mph (116.23 km/h)
80 mph (128.75 km/h)77.03 mph (123.98 km/h)
85 mph (136.79 km/h)81.85 mph (131.72 km/h)
90 mph (144.84 km/h)86.66 mph (139.47 km/h)
95 mph (152.89 km/h)91.48 mph (147.22 km/h)
100 mph (160.93 km/h)96.29 mph (154.97 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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