Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/80r15 vs 205/85r15 Tire Comparison Side By Side
  215/80-15 205/85-15 Difference
Diameter inches (mm) 28.54 (725) 28.72 (729.5) 0.18 (4.5) 0.6%
Width inches (mm) 8.46 (215) 8.07 (205) -0.39 (-10) -4.7%
Circum. inches (mm) 89.67 (2277.65) 90.23 (2291.79) 0.56 (14.14) 0.6%
Sidewall Height inches (mm) 6.77 (172) 6.86 (174.25) 0.09 (2.25) 1.3%
Revolutions per mile (km) 706.58 (439.05) 702.22 (436.34) -4.36 (-2.71) -0.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.12 mph (32.39 km/h)
25 mph (40.23 km/h)25.16 mph (40.48 km/h)
30 mph (48.28 km/h)30.19 mph (48.58 km/h)
35 mph (56.33 km/h)35.22 mph (56.68 km/h)
40 mph (64.37 km/h)40.25 mph (64.77 km/h)
45 mph (72.42 km/h)45.28 mph (72.87 km/h)
50 mph (80.47 km/h)50.31 mph (80.97 km/h)
55 mph (88.51 km/h)55.34 mph (89.06 km/h)
60 mph (96.56 km/h)60.37 mph (97.16 km/h)
65 mph (104.61 km/h)65.4 mph (105.26 km/h)
70 mph (112.65 km/h)70.43 mph (113.35 km/h)
75 mph (120.7 km/h)75.47 mph (121.45 km/h)
80 mph (128.75 km/h)80.5 mph (129.55 km/h)
85 mph (136.79 km/h)85.53 mph (137.64 km/h)
90 mph (144.84 km/h)90.56 mph (145.74 km/h)
95 mph (152.89 km/h)95.59 mph (153.84 km/h)
100 mph (160.93 km/h)100.62 mph (161.93 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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