Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
205/55r15 vs 215/55r15 Tire Comparison Side By Side
  205/55-15 215/55-15 Difference
Diameter inches (mm) 23.88 (606.5) 24.31 (617.5) 0.43 (11) 1.8%
Width inches (mm) 8.07 (205) 8.46 (215) 0.39 (10) 4.9%
Circum. inches (mm) 75.01 (1905.38) 76.38 (1939.93) 1.36 (34.56) 1.8%
Sidewall Height inches (mm) 4.44 (112.75) 4.66 (118.25) 0.22 (5.5) 4.9%
Revolutions per mile (km) 844.63 (524.83) 829.59 (515.48) -15.05 (-9.35) -1.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.36 mph (32.77 km/h)
25 mph (40.23 km/h)25.45 mph (40.96 km/h)
30 mph (48.28 km/h)30.54 mph (49.16 km/h)
35 mph (56.33 km/h)35.63 mph (57.35 km/h)
40 mph (64.37 km/h)40.73 mph (65.54 km/h)
45 mph (72.42 km/h)45.82 mph (73.73 km/h)
50 mph (80.47 km/h)50.91 mph (81.93 km/h)
55 mph (88.51 km/h)56 mph (90.12 km/h)
60 mph (96.56 km/h)61.09 mph (98.31 km/h)
65 mph (104.61 km/h)66.18 mph (106.5 km/h)
70 mph (112.65 km/h)71.27 mph (114.7 km/h)
75 mph (120.7 km/h)76.36 mph (122.89 km/h)
80 mph (128.75 km/h)81.45 mph (131.08 km/h)
85 mph (136.79 km/h)86.54 mph (139.28 km/h)
90 mph (144.84 km/h)91.63 mph (147.47 km/h)
95 mph (152.89 km/h)96.72 mph (155.66 km/h)
100 mph (160.93 km/h)101.81 mph (163.85 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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