Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/65r15 vs 205/70r15 Tire Comparison Side By Side
  215/65-15 205/70-15 Difference
Diameter inches (mm) 26 (660.5) 26.3 (668) 0.3 (7.5) 1.1%
Width inches (mm) 8.46 (215) 8.07 (205) -0.39 (-10) -4.7%
Circum. inches (mm) 81.69 (2075.02) 82.62 (2098.58) 0.93 (23.56) 1.1%
Sidewall Height inches (mm) 5.5 (139.75) 5.65 (143.5) 0.15 (3.75) 2.7%
Revolutions per mile (km) 775.58 (481.92) 766.87 (476.51) -8.71 (-5.41) -1.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.23 mph (32.55 km/h)
25 mph (40.23 km/h)25.28 mph (40.69 km/h)
30 mph (48.28 km/h)30.34 mph (48.83 km/h)
35 mph (56.33 km/h)35.4 mph (56.97 km/h)
40 mph (64.37 km/h)40.45 mph (65.1 km/h)
45 mph (72.42 km/h)45.51 mph (73.24 km/h)
50 mph (80.47 km/h)50.57 mph (81.38 km/h)
55 mph (88.51 km/h)55.62 mph (89.52 km/h)
60 mph (96.56 km/h)60.68 mph (97.66 km/h)
65 mph (104.61 km/h)65.74 mph (105.8 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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