Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
205/65r15 vs 205/70r15 Tire Comparison Side By Side
  205/65-15 205/70-15 Difference
Diameter inches (mm) 25.49 (647.5) 26.3 (668) 0.81 (20.5) 3.2%
Width inches (mm) 8.07 (205) 8.07 (205) 0 (0) 0%
Circum. inches (mm) 80.09 (2034.18) 82.62 (2098.58) 2.54 (64.4) 3.2%
Sidewall Height inches (mm) 5.25 (133.25) 5.65 (143.5) 0.4 (10.25) 7.7%
Revolutions per mile (km) 791.15 (491.6) 766.87 (476.51) -24.28 (-15.09) -3.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.63 mph (33.21 km/h)
25 mph (40.23 km/h)25.79 mph (41.51 km/h)
30 mph (48.28 km/h)30.95 mph (49.81 km/h)
35 mph (56.33 km/h)36.11 mph (58.11 km/h)
40 mph (64.37 km/h)41.27 mph (66.41 km/h)
45 mph (72.42 km/h)46.42 mph (74.71 km/h)
50 mph (80.47 km/h)51.58 mph (83.01 km/h)
55 mph (88.51 km/h)56.74 mph (91.32 km/h)
60 mph (96.56 km/h)61.9 mph (99.62 km/h)
65 mph (104.61 km/h)67.06 mph (107.92 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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