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 205/50r15 Tire Comparison Side By Side
  155/65-15 205/50-15 Difference
Diameter inches (mm) 22.93 (582.5) 23.07 (586) 0.14 (3.5) 0.6%
Width inches (mm) 6.1 (155) 8.07 (205) 1.97 (50) 32.3%
Circum. inches (mm) 72.05 (1829.98) 72.48 (1840.97) 0.43 (11) 0.6%
Sidewall Height inches (mm) 3.97 (100.75) 4.04 (102.5) 0.07 (1.75) 1.7%
Revolutions per mile (km) 879.43 (546.45) 874.18 (543.19) -5.25 (-3.26) -0.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.12 mph (32.38 km/h)
25 mph (40.23 km/h)25.15 mph (40.48 km/h)
30 mph (48.28 km/h)30.18 mph (48.57 km/h)
35 mph (56.33 km/h)35.21 mph (56.67 km/h)
40 mph (64.37 km/h)40.24 mph (64.76 km/h)
45 mph (72.42 km/h)45.27 mph (72.86 km/h)
50 mph (80.47 km/h)50.3 mph (80.95 km/h)
55 mph (88.51 km/h)55.33 mph (89.05 km/h)
60 mph (96.56 km/h)60.36 mph (97.14 km/h)
65 mph (104.61 km/h)65.39 mph (105.24 km/h)
70 mph (112.65 km/h)70.42 mph (113.33 km/h)
75 mph (120.7 km/h)75.45 mph (121.43 km/h)
80 mph (128.75 km/h)80.48 mph (129.52 km/h)
85 mph (136.79 km/h)85.51 mph (137.62 km/h)
90 mph (144.84 km/h)90.54 mph (145.71 km/h)
95 mph (152.89 km/h)95.57 mph (153.81 km/h)
100 mph (160.93 km/h)100.6 mph (161.9 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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