Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
185/65r15 vs 205/55r16 Tire Comparison Side By Side
  185/65-15 205/55-16 Difference
Diameter inches (mm) 24.47 (621.5) 24.88 (631.9) 0.41 (10.4) 1.7%
Width inches (mm) 7.28 (185) 8.07 (205) 0.79 (20) 10.8%
Circum. inches (mm) 76.87 (1952.5) 78.16 (1985.17) 1.29 (32.67) 1.7%
Sidewall Height inches (mm) 4.73 (120.25) 4.44 (112.75) -0.3 (-7.5) -6.2%
Revolutions per mile (km) 824.25 (512.16) 810.68 (503.73) -13.57 (-8.43) -1.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.33 mph (32.73 km/h)
25 mph (40.23 km/h)25.42 mph (40.91 km/h)
30 mph (48.28 km/h)30.5 mph (49.09 km/h)
35 mph (56.33 km/h)35.59 mph (57.27 km/h)
40 mph (64.37 km/h)40.67 mph (65.45 km/h)
45 mph (72.42 km/h)45.75 mph (73.63 km/h)
50 mph (80.47 km/h)50.84 mph (81.81 km/h)
55 mph (88.51 km/h)55.92 mph (90 km/h)
60 mph (96.56 km/h)61 mph (98.18 km/h)
65 mph (104.61 km/h)66.09 mph (106.36 km/h)
70 mph (112.65 km/h)71.17 mph (114.54 km/h)
75 mph (120.7 km/h)76.26 mph (122.72 km/h)
80 mph (128.75 km/h)81.34 mph (130.9 km/h)
85 mph (136.79 km/h)86.42 mph (139.08 km/h)
90 mph (144.84 km/h)91.51 mph (147.26 km/h)
95 mph (152.89 km/h)96.59 mph (155.45 km/h)
100 mph (160.93 km/h)101.67 mph (163.63 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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