Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/45r17 vs 215/60r17 Tire Comparison Side By Side
  225/45-17 215/60-17 Difference
Diameter inches (mm) 24.97 (634.3) 27.16 (689.8) 2.19 (55.5) 8.7%
Width inches (mm) 8.86 (225) 8.46 (215) -0.39 (-10) -4.4%
Circum. inches (mm) 78.45 (1992.71) 85.32 (2167.07) 6.86 (174.36) 8.7%
Sidewall Height inches (mm) 3.99 (101.25) 5.08 (129) 1.09 (27.75) 27.4%
Revolutions per mile (km) 807.61 (501.83) 742.64 (461.45) -64.98 (-40.38) -8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.75 mph (35 km/h)
25 mph (40.23 km/h)27.19 mph (43.75 km/h)
30 mph (48.28 km/h)32.62 mph (52.5 km/h)
35 mph (56.33 km/h)38.06 mph (61.26 km/h)
40 mph (64.37 km/h)43.5 mph (70.01 km/h)
45 mph (72.42 km/h)48.94 mph (78.76 km/h)
50 mph (80.47 km/h)54.37 mph (87.51 km/h)
55 mph (88.51 km/h)59.81 mph (96.26 km/h)
60 mph (96.56 km/h)65.25 mph (105.01 km/h)
65 mph (104.61 km/h)70.69 mph (113.76 km/h)
70 mph (112.65 km/h)76.12 mph (122.51 km/h)
75 mph (120.7 km/h)81.56 mph (131.26 km/h)
80 mph (128.75 km/h)87 mph (140.01 km/h)
85 mph (136.79 km/h)92.44 mph (148.76 km/h)
90 mph (144.84 km/h)97.87 mph (157.51 km/h)
95 mph (152.89 km/h)103.31 mph (166.27 km/h)
100 mph (160.93 km/h)108.75 mph (175.02 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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