Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
305/25r19 vs 285/30r19 Tire Comparison Side By Side
  305/25-19 285/30-19 Difference
Diameter inches (mm) 25 (635.1) 25.73 (653.6) 0.73 (18.5) 2.9%
Width inches (mm) 12.01 (305) 11.22 (285) -0.79 (-20) -6.6%
Circum. inches (mm) 78.55 (1995.23) 80.84 (2053.34) 2.29 (58.12) 2.9%
Sidewall Height inches (mm) 3 (76.25) 3.37 (85.5) 0.36 (9.25) 12.1%
Revolutions per mile (km) 806.6 (501.2) 783.77 (487.01) -22.83 (-14.19) -2.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.58 mph (33.12 km/h)
25 mph (40.23 km/h)25.73 mph (41.41 km/h)
30 mph (48.28 km/h)30.87 mph (49.69 km/h)
35 mph (56.33 km/h)36.02 mph (57.97 km/h)
40 mph (64.37 km/h)41.17 mph (66.25 km/h)
45 mph (72.42 km/h)46.31 mph (74.53 km/h)
50 mph (80.47 km/h)51.46 mph (82.81 km/h)
55 mph (88.51 km/h)56.6 mph (91.09 km/h)
60 mph (96.56 km/h)61.75 mph (99.37 km/h)
65 mph (104.61 km/h)66.89 mph (107.65 km/h)
70 mph (112.65 km/h)72.04 mph (115.94 km/h)
75 mph (120.7 km/h)77.18 mph (124.22 km/h)
80 mph (128.75 km/h)82.33 mph (132.5 km/h)
85 mph (136.79 km/h)87.48 mph (140.78 km/h)
90 mph (144.84 km/h)92.62 mph (149.06 km/h)
95 mph (152.89 km/h)97.77 mph (157.34 km/h)
100 mph (160.93 km/h)102.91 mph (165.62 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
19952317249526062724280929033013316633193488362438704142435444904566484652376085
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