Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/65r16 vs 215/65r16 Tire Comparison Side By Side
  225/65-16 215/65-16 Difference
Diameter inches (mm) 27.52 (698.9) 27 (685.9) -0.51 (-13) -1.9%
Width inches (mm) 8.86 (225) 8.46 (215) -0.39 (-10) -4.4%
Circum. inches (mm) 86.44 (2195.66) 84.84 (2154.82) -1.61 (-40.84) -1.9%
Sidewall Height inches (mm) 5.76 (146.25) 5.5 (139.75) -0.26 (-6.5) -4.4%
Revolutions per mile (km) 732.97 (455.44) 746.86 (464.08) 13.89 (8.63) 1.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.63 mph (31.59 km/h)
25 mph (40.23 km/h)24.53 mph (39.49 km/h)
30 mph (48.28 km/h)29.44 mph (47.38 km/h)
35 mph (56.33 km/h)34.35 mph (55.28 km/h)
40 mph (64.37 km/h)39.26 mph (63.18 km/h)
45 mph (72.42 km/h)44.16 mph (71.07 km/h)
50 mph (80.47 km/h)49.07 mph (78.97 km/h)
55 mph (88.51 km/h)53.98 mph (86.87 km/h)
60 mph (96.56 km/h)58.88 mph (94.76 km/h)
65 mph (104.61 km/h)63.79 mph (102.66 km/h)
70 mph (112.65 km/h)68.7 mph (110.56 km/h)
75 mph (120.7 km/h)73.6 mph (118.46 km/h)
80 mph (128.75 km/h)78.51 mph (126.35 km/h)
85 mph (136.79 km/h)83.42 mph (134.25 km/h)
90 mph (144.84 km/h)88.33 mph (142.15 km/h)
95 mph (152.89 km/h)93.23 mph (150.04 km/h)
100 mph (160.93 km/h)98.14 mph (157.94 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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