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 225/75r15 Tire Comparison Side By Side
  205/65-15 225/75-15 Difference
Diameter inches (mm) 25.49 (647.5) 28.29 (718.5) 2.8 (71) 11%
Width inches (mm) 8.07 (205) 8.86 (225) 0.79 (20) 9.8%
Circum. inches (mm) 80.09 (2034.18) 88.87 (2257.23) 8.78 (223.05) 11%
Sidewall Height inches (mm) 5.25 (133.25) 6.64 (168.75) 1.4 (35.5) 26.6%
Revolutions per mile (km) 791.15 (491.6) 712.97 (443.02) -78.18 (-48.58) -9.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.19 mph (35.72 km/h)
25 mph (40.23 km/h)27.74 mph (44.65 km/h)
30 mph (48.28 km/h)33.29 mph (53.57 km/h)
35 mph (56.33 km/h)38.84 mph (62.5 km/h)
40 mph (64.37 km/h)44.39 mph (71.43 km/h)
45 mph (72.42 km/h)49.93 mph (80.36 km/h)
50 mph (80.47 km/h)55.48 mph (89.29 km/h)
55 mph (88.51 km/h)61.03 mph (98.22 km/h)
60 mph (96.56 km/h)66.58 mph (107.15 km/h)
65 mph (104.61 km/h)72.13 mph (116.08 km/h)
70 mph (112.65 km/h)77.68 mph (125.01 km/h)
75 mph (120.7 km/h)83.22 mph (133.94 km/h)
80 mph (128.75 km/h)88.77 mph (142.87 km/h)
85 mph (136.79 km/h)94.32 mph (151.79 km/h)
90 mph (144.84 km/h)99.87 mph (160.72 km/h)
95 mph (152.89 km/h)105.42 mph (169.65 km/h)
100 mph (160.93 km/h)110.97 mph (178.58 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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