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 195/80r15 Tire Comparison Side By Side
  215/80-15 195/80-15 Difference
Diameter inches (mm) 28.54 (725) 27.28 (693) -1.26 (-32) -4.4%
Width inches (mm) 8.46 (215) 7.68 (195) -0.79 (-20) -9.3%
Circum. inches (mm) 89.67 (2277.65) 85.71 (2177.12) -3.96 (-100.53) -4.4%
Sidewall Height inches (mm) 6.77 (172) 6.14 (156) -0.63 (-16) -9.3%
Revolutions per mile (km) 706.58 (439.05) 739.21 (459.32) 32.63 (20.27) 4.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.12 mph (30.77 km/h)
25 mph (40.23 km/h)23.9 mph (38.46 km/h)
30 mph (48.28 km/h)28.68 mph (46.15 km/h)
35 mph (56.33 km/h)33.46 mph (53.84 km/h)
40 mph (64.37 km/h)38.23 mph (61.53 km/h)
45 mph (72.42 km/h)43.01 mph (69.22 km/h)
50 mph (80.47 km/h)47.79 mph (76.92 km/h)
55 mph (88.51 km/h)52.57 mph (84.61 km/h)
60 mph (96.56 km/h)57.35 mph (92.3 km/h)
65 mph (104.61 km/h)62.13 mph (99.99 km/h)
70 mph (112.65 km/h)66.91 mph (107.68 km/h)
75 mph (120.7 km/h)71.69 mph (115.37 km/h)
80 mph (128.75 km/h)76.47 mph (123.07 km/h)
85 mph (136.79 km/h)81.25 mph (130.76 km/h)
90 mph (144.84 km/h)86.03 mph (138.45 km/h)
95 mph (152.89 km/h)90.81 mph (146.14 km/h)
100 mph (160.93 km/h)95.59 mph (153.83 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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