Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/75r15 vs 175/80r13 Tire Comparison Side By Side
  225/75-15 175/80-13 Difference
Diameter inches (mm) 28.29 (718.5) 24.02 (610.2) -4.26 (-108.3) -15.1%
Width inches (mm) 8.86 (225) 6.89 (175) -1.97 (-50) -22.2%
Circum. inches (mm) 88.87 (2257.23) 75.47 (1917) -13.4 (-340.23) -15.1%
Sidewall Height inches (mm) 6.64 (168.75) 5.51 (140) -1.13 (-28.75) -17%
Revolutions per mile (km) 712.97 (443.02) 839.51 (521.65) 126.54 (78.63) 17.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)16.99 mph (27.34 km/h)
25 mph (40.23 km/h)21.23 mph (34.17 km/h)
30 mph (48.28 km/h)25.48 mph (41 km/h)
35 mph (56.33 km/h)29.72 mph (47.84 km/h)
40 mph (64.37 km/h)33.97 mph (54.67 km/h)
45 mph (72.42 km/h)38.22 mph (61.5 km/h)
50 mph (80.47 km/h)42.46 mph (68.34 km/h)
55 mph (88.51 km/h)46.71 mph (75.17 km/h)
60 mph (96.56 km/h)50.96 mph (82.01 km/h)
65 mph (104.61 km/h)55.2 mph (88.84 km/h)
70 mph (112.65 km/h)59.45 mph (95.67 km/h)
75 mph (120.7 km/h)63.7 mph (102.51 km/h)
80 mph (128.75 km/h)67.94 mph (109.34 km/h)
85 mph (136.79 km/h)72.19 mph (116.18 km/h)
90 mph (144.84 km/h)76.43 mph (123.01 km/h)
95 mph (152.89 km/h)80.68 mph (129.84 km/h)
100 mph (160.93 km/h)84.93 mph (136.68 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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