Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/30r19 vs 235/35r19 Tire Comparison Side By Side
  255/30-19 235/35-19 Difference
Diameter inches (mm) 25.02 (635.6) 25.48 (647.1) 0.45 (11.5) 1.8%
Width inches (mm) 10.04 (255) 9.25 (235) -0.79 (-20) -7.8%
Circum. inches (mm) 78.61 (1996.8) 80.04 (2032.92) 1.42 (36.13) 1.8%
Sidewall Height inches (mm) 3.01 (76.5) 3.24 (82.25) 0.23 (5.75) 7.5%
Revolutions per mile (km) 805.96 (500.8) 791.64 (491.9) -14.32 (-8.9) -1.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.36 mph (32.77 km/h)
25 mph (40.23 km/h)25.45 mph (40.96 km/h)
30 mph (48.28 km/h)30.54 mph (49.15 km/h)
35 mph (56.33 km/h)35.63 mph (57.35 km/h)
40 mph (64.37 km/h)40.72 mph (65.54 km/h)
45 mph (72.42 km/h)45.81 mph (73.73 km/h)
50 mph (80.47 km/h)50.9 mph (81.92 km/h)
55 mph (88.51 km/h)56 mph (90.12 km/h)
60 mph (96.56 km/h)61.09 mph (98.31 km/h)
65 mph (104.61 km/h)66.18 mph (106.5 km/h)
70 mph (112.65 km/h)71.27 mph (114.69 km/h)
75 mph (120.7 km/h)76.36 mph (122.88 km/h)
80 mph (128.75 km/h)81.45 mph (131.08 km/h)
85 mph (136.79 km/h)86.54 mph (139.27 km/h)
90 mph (144.84 km/h)91.63 mph (147.46 km/h)
95 mph (152.89 km/h)96.72 mph (155.65 km/h)
100 mph (160.93 km/h)101.81 mph (163.85 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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