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 275/30r19 Tire Comparison Side By Side
  255/30-19 275/30-19 Difference
Diameter inches (mm) 25.02 (635.6) 25.5 (647.6) 0.47 (12) 1.9%
Width inches (mm) 10.04 (255) 10.83 (275) 0.79 (20) 7.8%
Circum. inches (mm) 78.61 (1996.8) 80.1 (2034.5) 1.48 (37.7) 1.9%
Sidewall Height inches (mm) 3.01 (76.5) 3.25 (82.5) 0.24 (6) 7.8%
Revolutions per mile (km) 805.96 (500.8) 791.03 (491.52) -14.93 (-9.28) -1.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.38 mph (32.79 km/h)
25 mph (40.23 km/h)25.47 mph (40.99 km/h)
30 mph (48.28 km/h)30.57 mph (49.19 km/h)
35 mph (56.33 km/h)35.66 mph (57.39 km/h)
40 mph (64.37 km/h)40.76 mph (65.59 km/h)
45 mph (72.42 km/h)45.85 mph (73.79 km/h)
50 mph (80.47 km/h)50.94 mph (81.99 km/h)
55 mph (88.51 km/h)56.04 mph (90.19 km/h)
60 mph (96.56 km/h)61.13 mph (98.38 km/h)
65 mph (104.61 km/h)66.23 mph (106.58 km/h)
70 mph (112.65 km/h)71.32 mph (114.78 km/h)
75 mph (120.7 km/h)76.42 mph (122.98 km/h)
80 mph (128.75 km/h)81.51 mph (131.18 km/h)
85 mph (136.79 km/h)86.6 mph (139.38 km/h)
90 mph (144.84 km/h)91.7 mph (147.58 km/h)
95 mph (152.89 km/h)96.79 mph (155.77 km/h)
100 mph (160.93 km/h)101.89 mph (163.97 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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