Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/80r16 vs 215/65r16 Tire Comparison Side By Side
  215/80-16 215/65-16 Difference
Diameter inches (mm) 29.54 (750.4) 27 (685.9) -2.54 (-64.5) -8.6%
Width inches (mm) 8.46 (215) 8.46 (215) 0 (0) 0%
Circum. inches (mm) 92.81 (2357.45) 84.84 (2154.82) -7.98 (-202.63) -8.6%
Sidewall Height inches (mm) 6.77 (172) 5.5 (139.75) -1.27 (-32.25) -18.8%
Revolutions per mile (km) 682.66 (424.19) 746.86 (464.08) 64.2 (39.89) 9.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.28 mph (29.42 km/h)
25 mph (40.23 km/h)22.85 mph (36.78 km/h)
30 mph (48.28 km/h)27.42 mph (44.13 km/h)
35 mph (56.33 km/h)31.99 mph (51.49 km/h)
40 mph (64.37 km/h)36.56 mph (58.84 km/h)
45 mph (72.42 km/h)41.13 mph (66.2 km/h)
50 mph (80.47 km/h)45.7 mph (73.55 km/h)
55 mph (88.51 km/h)50.27 mph (80.91 km/h)
60 mph (96.56 km/h)54.84 mph (88.26 km/h)
65 mph (104.61 km/h)59.41 mph (95.62 km/h)
70 mph (112.65 km/h)63.98 mph (102.97 km/h)
75 mph (120.7 km/h)68.55 mph (110.33 km/h)
80 mph (128.75 km/h)73.12 mph (117.68 km/h)
85 mph (136.79 km/h)77.69 mph (125.04 km/h)
90 mph (144.84 km/h)82.26 mph (132.39 km/h)
95 mph (152.89 km/h)86.83 mph (139.75 km/h)
100 mph (160.93 km/h)91.4 mph (147.1 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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