Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/60r17 vs 225/65r17 Tire Comparison Side By Side
  215/60-17 225/65-17 Difference
Diameter inches (mm) 27.16 (689.8) 28.52 (724.3) 1.36 (34.5) 5%
Width inches (mm) 8.46 (215) 8.86 (225) 0.39 (10) 4.7%
Circum. inches (mm) 85.32 (2167.07) 89.58 (2275.46) 4.27 (108.38) 5%
Sidewall Height inches (mm) 5.08 (129) 5.76 (146.25) 0.68 (17.25) 13.4%
Revolutions per mile (km) 742.64 (461.45) 707.26 (439.47) -35.37 (-21.98) -4.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21 mph (33.8 km/h)
25 mph (40.23 km/h)26.25 mph (42.25 km/h)
30 mph (48.28 km/h)31.5 mph (50.7 km/h)
35 mph (56.33 km/h)36.75 mph (59.14 km/h)
40 mph (64.37 km/h)42 mph (67.59 km/h)
45 mph (72.42 km/h)47.25 mph (76.04 km/h)
50 mph (80.47 km/h)52.5 mph (84.49 km/h)
55 mph (88.51 km/h)57.75 mph (92.94 km/h)
60 mph (96.56 km/h)63 mph (101.39 km/h)
65 mph (104.61 km/h)68.25 mph (109.84 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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