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 225/70r15 Tire Comparison Side By Side
  205/70-15 225/70-15 Difference
Diameter inches (mm) 26.3 (668) 27.4 (696) 1.1 (28) 4.2%
Width inches (mm) 8.07 (205) 8.86 (225) 0.79 (20) 9.8%
Circum. inches (mm) 82.62 (2098.58) 86.08 (2186.55) 3.46 (87.96) 4.2%
Sidewall Height inches (mm) 5.65 (143.5) 6.2 (157.5) 0.55 (14) 9.8%
Revolutions per mile (km) 766.87 (476.51) 736.02 (457.34) -30.85 (-19.17) -4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.84 mph (33.54 km/h)
25 mph (40.23 km/h)26.05 mph (41.92 km/h)
30 mph (48.28 km/h)31.26 mph (50.3 km/h)
35 mph (56.33 km/h)36.47 mph (58.69 km/h)
40 mph (64.37 km/h)41.68 mph (67.07 km/h)
45 mph (72.42 km/h)46.89 mph (75.46 km/h)
50 mph (80.47 km/h)52.1 mph (83.84 km/h)
55 mph (88.51 km/h)57.31 mph (92.22 km/h)
60 mph (96.56 km/h)62.51 mph (100.61 km/h)
65 mph (104.61 km/h)67.72 mph (108.99 km/h)
70 mph (112.65 km/h)72.93 mph (117.38 km/h)
75 mph (120.7 km/h)78.14 mph (125.76 km/h)
80 mph (128.75 km/h)83.35 mph (134.14 km/h)
85 mph (136.79 km/h)88.56 mph (142.53 km/h)
90 mph (144.84 km/h)93.77 mph (150.91 km/h)
95 mph (152.89 km/h)98.98 mph (159.3 km/h)
100 mph (160.93 km/h)104.19 mph (167.68 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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