Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
205/80r16 vs 215/65r16 Tire Comparison Side By Side
  205/80-16 215/65-16 Difference
Diameter inches (mm) 28.91 (734.4) 27 (685.9) -1.91 (-48.5) -6.6%
Width inches (mm) 8.07 (205) 8.46 (215) 0.39 (10) 4.9%
Circum. inches (mm) 90.83 (2307.19) 84.84 (2154.82) -6 (-152.37) -6.6%
Sidewall Height inches (mm) 6.46 (164) 5.5 (139.75) -0.95 (-24.25) -14.8%
Revolutions per mile (km) 697.54 (433.43) 746.86 (464.08) 49.32 (30.65) 7.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.68 mph (30.06 km/h)
25 mph (40.23 km/h)23.35 mph (37.58 km/h)
30 mph (48.28 km/h)28.02 mph (45.09 km/h)
35 mph (56.33 km/h)32.69 mph (52.61 km/h)
40 mph (64.37 km/h)37.36 mph (60.12 km/h)
45 mph (72.42 km/h)42.03 mph (67.64 km/h)
50 mph (80.47 km/h)46.7 mph (75.15 km/h)
55 mph (88.51 km/h)51.37 mph (82.67 km/h)
60 mph (96.56 km/h)56.04 mph (90.18 km/h)
65 mph (104.61 km/h)60.71 mph (97.7 km/h)
70 mph (112.65 km/h)65.38 mph (105.21 km/h)
75 mph (120.7 km/h)70.05 mph (112.73 km/h)
80 mph (128.75 km/h)74.72 mph (120.25 km/h)
85 mph (136.79 km/h)79.39 mph (127.76 km/h)
90 mph (144.84 km/h)84.06 mph (135.28 km/h)
95 mph (152.89 km/h)88.73 mph (142.79 km/h)
100 mph (160.93 km/h)93.4 mph (150.31 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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