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 215/55r17 Tire Comparison Side By Side
  205/65-15 215/55-17 Difference
Diameter inches (mm) 25.49 (647.5) 26.31 (668.3) 0.82 (20.8) 3.2%
Width inches (mm) 8.07 (205) 8.46 (215) 0.39 (10) 4.9%
Circum. inches (mm) 80.09 (2034.18) 82.66 (2099.53) 2.57 (65.35) 3.2%
Sidewall Height inches (mm) 5.25 (133.25) 4.66 (118.25) -0.59 (-15) -11.3%
Revolutions per mile (km) 791.15 (491.6) 766.53 (476.3) -24.62 (-15.3) -3.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.64 mph (33.22 km/h)
25 mph (40.23 km/h)25.8 mph (41.53 km/h)
30 mph (48.28 km/h)30.96 mph (49.83 km/h)
35 mph (56.33 km/h)36.12 mph (58.14 km/h)
40 mph (64.37 km/h)41.28 mph (66.44 km/h)
45 mph (72.42 km/h)46.45 mph (74.75 km/h)
50 mph (80.47 km/h)51.61 mph (83.05 km/h)
55 mph (88.51 km/h)56.77 mph (91.36 km/h)
60 mph (96.56 km/h)61.93 mph (99.66 km/h)
65 mph (104.61 km/h)67.09 mph (107.97 km/h)
70 mph (112.65 km/h)72.25 mph (116.27 km/h)
75 mph (120.7 km/h)77.41 mph (124.58 km/h)
80 mph (128.75 km/h)82.57 mph (132.88 km/h)
85 mph (136.79 km/h)87.73 mph (141.19 km/h)
90 mph (144.84 km/h)92.89 mph (149.49 km/h)
95 mph (152.89 km/h)98.05 mph (157.8 km/h)
100 mph (160.93 km/h)103.21 mph (166.1 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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