Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/50r14 vs 270/30r14 Tire Comparison Side By Side
  225/50-14 270/30-14 Difference
Diameter inches (mm) 22.86 (580.6) 20.38 (517.6) -2.48 (-63) -10.9%
Width inches (mm) 8.86 (225) 10.63 (270) 1.77 (45) 20%
Circum. inches (mm) 71.81 (1824.01) 64.02 (1626.09) -7.79 (-197.92) -10.9%
Sidewall Height inches (mm) 4.43 (112.5) 3.19 (81) -1.24 (-31.5) -28%
Revolutions per mile (km) 882.31 (548.24) 989.7 (614.97) 107.39 (66.73) 12.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)17.83 mph (28.69 km/h)
25 mph (40.23 km/h)22.29 mph (35.87 km/h)
30 mph (48.28 km/h)26.74 mph (43.04 km/h)
35 mph (56.33 km/h)31.2 mph (50.22 km/h)
40 mph (64.37 km/h)35.66 mph (57.39 km/h)
45 mph (72.42 km/h)40.12 mph (64.56 km/h)
50 mph (80.47 km/h)44.57 mph (71.74 km/h)
55 mph (88.51 km/h)49.03 mph (78.91 km/h)
60 mph (96.56 km/h)53.49 mph (86.08 km/h)
65 mph (104.61 km/h)57.95 mph (93.26 km/h)
70 mph (112.65 km/h)62.4 mph (100.43 km/h)
75 mph (120.7 km/h)66.86 mph (107.6 km/h)
80 mph (128.75 km/h)71.32 mph (114.78 km/h)
85 mph (136.79 km/h)75.78 mph (121.95 km/h)
90 mph (144.84 km/h)80.23 mph (129.12 km/h)
95 mph (152.89 km/h)84.69 mph (136.3 km/h)
100 mph (160.93 km/h)89.15 mph (143.47 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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