Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/40r17 vs 225/40r17 Tire Comparison Side By Side
  215/40-17 225/40-17 Difference
Diameter inches (mm) 23.77 (603.8) 24.09 (611.8) 0.31 (8) 1.3%
Width inches (mm) 8.46 (215) 8.86 (225) 0.39 (10) 4.7%
Circum. inches (mm) 74.68 (1896.89) 75.67 (1922.03) 0.99 (25.13) 1.3%
Sidewall Height inches (mm) 3.39 (86) 3.54 (90) 0.16 (4) 4.7%
Revolutions per mile (km) 848.41 (527.18) 837.32 (520.28) -11.09 (-6.89) -1.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.26 mph (32.61 km/h)
25 mph (40.23 km/h)25.33 mph (40.77 km/h)
30 mph (48.28 km/h)30.4 mph (48.92 km/h)
35 mph (56.33 km/h)35.46 mph (57.07 km/h)
40 mph (64.37 km/h)40.53 mph (65.23 km/h)
45 mph (72.42 km/h)45.6 mph (73.38 km/h)
50 mph (80.47 km/h)50.66 mph (81.53 km/h)
55 mph (88.51 km/h)55.73 mph (89.69 km/h)
60 mph (96.56 km/h)60.79 mph (97.84 km/h)
65 mph (104.61 km/h)65.86 mph (105.99 km/h)
70 mph (112.65 km/h)70.93 mph (114.15 km/h)
75 mph (120.7 km/h)75.99 mph (122.3 km/h)
80 mph (128.75 km/h)81.06 mph (130.45 km/h)
85 mph (136.79 km/h)86.13 mph (138.61 km/h)
90 mph (144.84 km/h)91.19 mph (146.76 km/h)
95 mph (152.89 km/h)96.26 mph (154.91 km/h)
100 mph (160.93 km/h)101.32 mph (163.07 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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