Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/55r16 vs 215/65r16 Tire Comparison Side By Side
  225/55-16 215/65-16 Difference
Diameter inches (mm) 25.74 (653.9) 27 (685.9) 1.26 (32) 4.9%
Width inches (mm) 8.86 (225) 8.46 (215) -0.39 (-10) -4.4%
Circum. inches (mm) 80.88 (2054.29) 84.84 (2154.82) 3.96 (100.53) 4.9%
Sidewall Height inches (mm) 4.87 (123.75) 5.5 (139.75) 0.63 (16) 12.9%
Revolutions per mile (km) 783.41 (486.79) 746.86 (464.08) -36.55 (-22.71) -4.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.98 mph (33.76 km/h)
25 mph (40.23 km/h)26.22 mph (42.2 km/h)
30 mph (48.28 km/h)31.47 mph (50.64 km/h)
35 mph (56.33 km/h)36.71 mph (59.08 km/h)
40 mph (64.37 km/h)41.96 mph (67.52 km/h)
45 mph (72.42 km/h)47.2 mph (75.96 km/h)
50 mph (80.47 km/h)52.45 mph (84.41 km/h)
55 mph (88.51 km/h)57.69 mph (92.85 km/h)
60 mph (96.56 km/h)62.94 mph (101.29 km/h)
65 mph (104.61 km/h)68.18 mph (109.73 km/h)
70 mph (112.65 km/h)73.43 mph (118.17 km/h)
75 mph (120.7 km/h)78.67 mph (126.61 km/h)
80 mph (128.75 km/h)83.91 mph (135.05 km/h)
85 mph (136.79 km/h)89.16 mph (143.49 km/h)
90 mph (144.84 km/h)94.4 mph (151.93 km/h)
95 mph (152.89 km/h)99.65 mph (160.37 km/h)
100 mph (160.93 km/h)104.89 mph (168.81 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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