Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
185/65r15 vs 205/45r16 Tire Comparison Side By Side
  185/65-15 205/45-16 Difference
Diameter inches (mm) 24.47 (621.5) 23.26 (590.9) -1.2 (-30.6) -4.9%
Width inches (mm) 7.28 (185) 8.07 (205) 0.79 (20) 10.8%
Circum. inches (mm) 76.87 (1952.5) 73.09 (1856.37) -3.78 (-96.13) -4.9%
Sidewall Height inches (mm) 4.73 (120.25) 3.63 (92.25) -1.1 (-28) -23.3%
Revolutions per mile (km) 824.25 (512.16) 866.93 (538.69) 42.68 (26.52) 5.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.02 mph (30.6 km/h)
25 mph (40.23 km/h)23.77 mph (38.25 km/h)
30 mph (48.28 km/h)28.52 mph (45.9 km/h)
35 mph (56.33 km/h)33.28 mph (53.55 km/h)
40 mph (64.37 km/h)38.03 mph (61.2 km/h)
45 mph (72.42 km/h)42.78 mph (68.85 km/h)
50 mph (80.47 km/h)47.54 mph (76.51 km/h)
55 mph (88.51 km/h)52.29 mph (84.16 km/h)
60 mph (96.56 km/h)57.05 mph (91.81 km/h)
65 mph (104.61 km/h)61.8 mph (99.46 km/h)
70 mph (112.65 km/h)66.55 mph (107.11 km/h)
75 mph (120.7 km/h)71.31 mph (114.76 km/h)
80 mph (128.75 km/h)76.06 mph (122.41 km/h)
85 mph (136.79 km/h)80.81 mph (130.06 km/h)
90 mph (144.84 km/h)85.57 mph (137.71 km/h)
95 mph (152.89 km/h)90.32 mph (145.36 km/h)
100 mph (160.93 km/h)95.08 mph (153.01 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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