Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/45r19 vs 225/25r19 Tire Comparison Side By Side
  225/45-19 225/25-19 Difference
Diameter inches (mm) 26.97 (685.1) 23.43 (595.1) -3.54 (-90) -13.1%
Width inches (mm) 8.86 (225) 8.86 (225) 0 (0) 0%
Circum. inches (mm) 84.74 (2152.31) 73.6 (1869.56) -11.13 (-282.74) -13.1%
Sidewall Height inches (mm) 3.99 (101.25) 2.21 (56.25) -1.77 (-45) -44.4%
Revolutions per mile (km) 747.73 (464.62) 860.81 (534.88) 113.08 (70.27) 15.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)17.37 mph (27.96 km/h)
25 mph (40.23 km/h)21.72 mph (34.95 km/h)
30 mph (48.28 km/h)26.06 mph (41.94 km/h)
35 mph (56.33 km/h)30.4 mph (48.93 km/h)
40 mph (64.37 km/h)34.75 mph (55.92 km/h)
45 mph (72.42 km/h)39.09 mph (62.91 km/h)
50 mph (80.47 km/h)43.43 mph (69.9 km/h)
55 mph (88.51 km/h)47.77 mph (76.89 km/h)
60 mph (96.56 km/h)52.12 mph (83.88 km/h)
65 mph (104.61 km/h)56.46 mph (90.87 km/h)
70 mph (112.65 km/h)60.8 mph (97.86 km/h)
75 mph (120.7 km/h)65.15 mph (104.84 km/h)
80 mph (128.75 km/h)69.49 mph (111.83 km/h)
85 mph (136.79 km/h)73.83 mph (118.82 km/h)
90 mph (144.84 km/h)78.18 mph (125.81 km/h)
95 mph (152.89 km/h)82.52 mph (132.8 km/h)
100 mph (160.93 km/h)86.86 mph (139.79 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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