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 255/35r19 Tire Comparison Side By Side
  255/30-19 255/35-19 Difference
Diameter inches (mm) 25.02 (635.6) 26.03 (661.1) 1 (25.5) 4%
Width inches (mm) 10.04 (255) 10.04 (255) 0 (0) 0%
Circum. inches (mm) 78.61 (1996.8) 81.77 (2076.91) 3.15 (80.11) 4%
Sidewall Height inches (mm) 3.01 (76.5) 3.51 (89.25) 0.5 (12.75) 16.7%
Revolutions per mile (km) 805.96 (500.8) 774.88 (481.48) -31.09 (-19.32) -3.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.8 mph (33.48 km/h)
25 mph (40.23 km/h)26 mph (41.85 km/h)
30 mph (48.28 km/h)31.2 mph (50.22 km/h)
35 mph (56.33 km/h)36.4 mph (58.59 km/h)
40 mph (64.37 km/h)41.6 mph (66.96 km/h)
45 mph (72.42 km/h)46.81 mph (75.33 km/h)
50 mph (80.47 km/h)52.01 mph (83.7 km/h)
55 mph (88.51 km/h)57.21 mph (92.07 km/h)
60 mph (96.56 km/h)62.41 mph (100.43 km/h)
65 mph (104.61 km/h)67.61 mph (108.8 km/h)
70 mph (112.65 km/h)72.81 mph (117.17 km/h)
75 mph (120.7 km/h)78.01 mph (125.54 km/h)
80 mph (128.75 km/h)83.21 mph (133.91 km/h)
85 mph (136.79 km/h)88.41 mph (142.28 km/h)
90 mph (144.84 km/h)93.61 mph (150.65 km/h)
95 mph (152.89 km/h)98.81 mph (159.02 km/h)
100 mph (160.93 km/h)104.01 mph (167.39 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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