Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
155/65r15 vs 205/65r15 Tire Comparison Side By Side
  155/65-15 205/65-15 Difference
Diameter inches (mm) 22.93 (582.5) 25.49 (647.5) 2.56 (65) 11.2%
Width inches (mm) 6.1 (155) 8.07 (205) 1.97 (50) 32.3%
Circum. inches (mm) 72.05 (1829.98) 80.09 (2034.18) 8.04 (204.2) 11.2%
Sidewall Height inches (mm) 3.97 (100.75) 5.25 (133.25) 1.28 (32.5) 32.3%
Revolutions per mile (km) 879.43 (546.45) 791.15 (491.6) -88.28 (-54.86) -10%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.23 mph (35.78 km/h)
25 mph (40.23 km/h)27.79 mph (44.72 km/h)
30 mph (48.28 km/h)33.35 mph (53.67 km/h)
35 mph (56.33 km/h)38.91 mph (62.61 km/h)
40 mph (64.37 km/h)44.46 mph (71.56 km/h)
45 mph (72.42 km/h)50.02 mph (80.5 km/h)
50 mph (80.47 km/h)55.58 mph (89.45 km/h)
55 mph (88.51 km/h)61.14 mph (98.39 km/h)
60 mph (96.56 km/h)66.7 mph (107.34 km/h)
65 mph (104.61 km/h)72.25 mph (116.28 km/h)
70 mph (112.65 km/h)77.81 mph (125.23 km/h)
75 mph (120.7 km/h)83.37 mph (134.17 km/h)
80 mph (128.75 km/h)88.93 mph (143.11 km/h)
85 mph (136.79 km/h)94.48 mph (152.06 km/h)
90 mph (144.84 km/h)100.04 mph (161 km/h)
95 mph (152.89 km/h)105.6 mph (169.95 km/h)
100 mph (160.93 km/h)111.16 mph (178.89 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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