Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
205/70r15 vs 215/65r16 Tire Comparison Side By Side
  205/70-15 215/65-16 Difference
Diameter inches (mm) 26.3 (668) 27 (685.9) 0.7 (17.9) 2.7%
Width inches (mm) 8.07 (205) 8.46 (215) 0.39 (10) 4.9%
Circum. inches (mm) 82.62 (2098.58) 84.84 (2154.82) 2.21 (56.23) 2.7%
Sidewall Height inches (mm) 5.65 (143.5) 5.5 (139.75) -0.15 (-3.75) -2.6%
Revolutions per mile (km) 766.87 (476.51) 746.86 (464.08) -20.01 (-12.44) -2.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.54 mph (33.05 km/h)
25 mph (40.23 km/h)25.67 mph (41.31 km/h)
30 mph (48.28 km/h)30.8 mph (49.57 km/h)
35 mph (56.33 km/h)35.94 mph (57.84 km/h)
40 mph (64.37 km/h)41.07 mph (66.1 km/h)
45 mph (72.42 km/h)46.21 mph (74.36 km/h)
50 mph (80.47 km/h)51.34 mph (82.62 km/h)
55 mph (88.51 km/h)56.47 mph (90.89 km/h)
60 mph (96.56 km/h)61.61 mph (99.15 km/h)
65 mph (104.61 km/h)66.74 mph (107.41 km/h)
70 mph (112.65 km/h)71.88 mph (115.67 km/h)
75 mph (120.7 km/h)77.01 mph (123.94 km/h)
80 mph (128.75 km/h)82.14 mph (132.2 km/h)
85 mph (136.79 km/h)87.28 mph (140.46 km/h)
90 mph (144.84 km/h)92.41 mph (148.72 km/h)
95 mph (152.89 km/h)97.55 mph (156.98 km/h)
100 mph (160.93 km/h)102.68 mph (165.25 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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