Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/55r17 vs 215/50r17 Tire Comparison Side By Side
  215/55-17 215/50-17 Difference
Diameter inches (mm) 26.31 (668.3) 25.46 (646.8) -0.85 (-21.5) -3.2%
Width inches (mm) 8.46 (215) 8.46 (215) 0 (0) 0%
Circum. inches (mm) 82.66 (2099.53) 80 (2031.98) -2.66 (-67.54) -3.2%
Sidewall Height inches (mm) 4.66 (118.25) 4.23 (107.5) -0.42 (-10.75) -9.1%
Revolutions per mile (km) 766.53 (476.3) 792.01 (492.13) 25.48 (15.83) 3.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.36 mph (31.15 km/h)
25 mph (40.23 km/h)24.2 mph (38.94 km/h)
30 mph (48.28 km/h)29.03 mph (46.73 km/h)
35 mph (56.33 km/h)33.87 mph (54.52 km/h)
40 mph (64.37 km/h)38.71 mph (62.3 km/h)
45 mph (72.42 km/h)43.55 mph (70.09 km/h)
50 mph (80.47 km/h)48.39 mph (77.88 km/h)
55 mph (88.51 km/h)53.23 mph (85.67 km/h)
60 mph (96.56 km/h)58.07 mph (93.45 km/h)
65 mph (104.61 km/h)62.91 mph (101.24 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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