Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
205/90r16 vs 205/70r16 Tire Comparison Side By Side
  205/90-16 205/70-16 Difference
Diameter inches (mm) 30.53 (775.4) 27.3 (693.4) -3.23 (-82) -10.6%
Width inches (mm) 8.07 (205) 8.07 (205) 0 (0) 0%
Circum. inches (mm) 95.91 (2435.99) 85.76 (2178.38) -10.14 (-257.61) -10.6%
Sidewall Height inches (mm) 7.26 (184.5) 5.65 (143.5) -1.61 (-41) -22.2%
Revolutions per mile (km) 660.65 (410.51) 738.78 (459.06) 78.13 (48.55) 11.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)17.88 mph (28.78 km/h)
25 mph (40.23 km/h)22.36 mph (35.98 km/h)
30 mph (48.28 km/h)26.83 mph (43.17 km/h)
35 mph (56.33 km/h)31.3 mph (50.37 km/h)
40 mph (64.37 km/h)35.77 mph (57.57 km/h)
45 mph (72.42 km/h)40.24 mph (64.76 km/h)
50 mph (80.47 km/h)44.71 mph (71.96 km/h)
55 mph (88.51 km/h)49.18 mph (79.15 km/h)
60 mph (96.56 km/h)53.65 mph (86.35 km/h)
65 mph (104.61 km/h)58.13 mph (93.55 km/h)
70 mph (112.65 km/h)62.6 mph (100.74 km/h)
75 mph (120.7 km/h)67.07 mph (107.94 km/h)
80 mph (128.75 km/h)71.54 mph (115.13 km/h)
85 mph (136.79 km/h)76.01 mph (122.33 km/h)
90 mph (144.84 km/h)80.48 mph (129.52 km/h)
95 mph (152.89 km/h)84.95 mph (136.72 km/h)
100 mph (160.93 km/h)89.42 mph (143.92 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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