Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/60r17 vs 205/70r15 Tire Comparison Side By Side
  225/60-17 205/70-15 Difference
Diameter inches (mm) 27.63 (701.8) 26.3 (668) -1.33 (-33.8) -4.8%
Width inches (mm) 8.86 (225) 8.07 (205) -0.79 (-20) -8.9%
Circum. inches (mm) 86.8 (2204.77) 82.62 (2098.58) -4.18 (-106.19) -4.8%
Sidewall Height inches (mm) 5.31 (135) 5.65 (143.5) 0.33 (8.5) 6.3%
Revolutions per mile (km) 729.94 (453.56) 766.87 (476.51) 36.93 (22.95) 5.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.04 mph (30.64 km/h)
25 mph (40.23 km/h)23.8 mph (38.3 km/h)
30 mph (48.28 km/h)28.56 mph (45.96 km/h)
35 mph (56.33 km/h)33.31 mph (53.61 km/h)
40 mph (64.37 km/h)38.07 mph (61.27 km/h)
45 mph (72.42 km/h)42.83 mph (68.93 km/h)
50 mph (80.47 km/h)47.59 mph (76.59 km/h)
55 mph (88.51 km/h)52.35 mph (84.25 km/h)
60 mph (96.56 km/h)57.11 mph (91.91 km/h)
65 mph (104.61 km/h)61.87 mph (99.57 km/h)
70 mph (112.65 km/h)66.63 mph (107.23 km/h)
75 mph (120.7 km/h)71.39 mph (114.89 km/h)
80 mph (128.75 km/h)76.15 mph (122.55 km/h)
85 mph (136.79 km/h)80.91 mph (130.21 km/h)
90 mph (144.84 km/h)85.67 mph (137.87 km/h)
95 mph (152.89 km/h)90.42 mph (145.52 km/h)
100 mph (160.93 km/h)95.18 mph (153.18 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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