Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
205/45r16 vs 215/65r16 Tire Comparison Side By Side
  205/45-16 215/65-16 Difference
Diameter inches (mm) 23.26 (590.9) 27 (685.9) 3.74 (95) 16.1%
Width inches (mm) 8.07 (205) 8.46 (215) 0.39 (10) 4.9%
Circum. inches (mm) 73.09 (1856.37) 84.84 (2154.82) 11.75 (298.45) 16.1%
Sidewall Height inches (mm) 3.63 (92.25) 5.5 (139.75) 1.87 (47.5) 51.5%
Revolutions per mile (km) 866.93 (538.69) 746.86 (464.08) -120.07 (-74.61) -13.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)23.22 mph (37.36 km/h)
25 mph (40.23 km/h)29.02 mph (46.7 km/h)
30 mph (48.28 km/h)34.82 mph (56.04 km/h)
35 mph (56.33 km/h)40.63 mph (65.38 km/h)
40 mph (64.37 km/h)46.43 mph (74.72 km/h)
45 mph (72.42 km/h)52.23 mph (84.06 km/h)
50 mph (80.47 km/h)58.04 mph (93.4 km/h)
55 mph (88.51 km/h)63.84 mph (102.74 km/h)
60 mph (96.56 km/h)69.65 mph (112.09 km/h)
65 mph (104.61 km/h)75.45 mph (121.43 km/h)
70 mph (112.65 km/h)81.25 mph (130.77 km/h)
75 mph (120.7 km/h)87.06 mph (140.11 km/h)
80 mph (128.75 km/h)92.86 mph (149.45 km/h)
85 mph (136.79 km/h)98.67 mph (158.79 km/h)
90 mph (144.84 km/h)104.47 mph (168.13 km/h)
95 mph (152.89 km/h)110.27 mph (177.47 km/h)
100 mph (160.93 km/h)116.08 mph (186.81 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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