Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/40r16 vs 225/50r16 Tire Comparison Side By Side
  225/40-16 225/50-16 Difference
Diameter inches (mm) 23.09 (586.4) 24.86 (631.4) 1.77 (45) 7.7%
Width inches (mm) 8.86 (225) 8.86 (225) 0 (0) 0%
Circum. inches (mm) 72.53 (1842.23) 78.09 (1983.6) 5.57 (141.37) 7.7%
Sidewall Height inches (mm) 3.54 (90) 4.43 (112.5) 0.89 (22.5) 25%
Revolutions per mile (km) 873.58 (542.82) 811.32 (504.13) -62.26 (-38.69) -7.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.53 mph (34.66 km/h)
25 mph (40.23 km/h)26.92 mph (43.32 km/h)
30 mph (48.28 km/h)32.3 mph (51.99 km/h)
35 mph (56.33 km/h)37.69 mph (60.65 km/h)
40 mph (64.37 km/h)43.07 mph (69.31 km/h)
45 mph (72.42 km/h)48.45 mph (77.98 km/h)
50 mph (80.47 km/h)53.84 mph (86.64 km/h)
55 mph (88.51 km/h)59.22 mph (95.31 km/h)
60 mph (96.56 km/h)64.6 mph (103.97 km/h)
65 mph (104.61 km/h)69.99 mph (112.64 km/h)
70 mph (112.65 km/h)75.37 mph (121.3 km/h)
75 mph (120.7 km/h)80.76 mph (129.96 km/h)
80 mph (128.75 km/h)86.14 mph (138.63 km/h)
85 mph (136.79 km/h)91.52 mph (147.29 km/h)
90 mph (144.84 km/h)96.91 mph (155.96 km/h)
95 mph (152.89 km/h)102.29 mph (164.62 km/h)
100 mph (160.93 km/h)107.67 mph (173.28 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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