Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/55r19 vs 235/55r19 Tire Comparison Side By Side
  255/55-19 235/55-19 Difference
Diameter inches (mm) 30.04 (763.1) 29.18 (741.1) -0.87 (-22) -2.9%
Width inches (mm) 10.04 (255) 9.25 (235) -0.79 (-20) -7.8%
Circum. inches (mm) 94.38 (2397.35) 91.66 (2328.23) -2.72 (-69.12) -2.9%
Sidewall Height inches (mm) 5.52 (140.25) 5.09 (129.25) -0.43 (-11) -7.8%
Revolutions per mile (km) 671.3 (417.13) 691.23 (429.51) 19.93 (12.38) 3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.42 mph (31.26 km/h)
25 mph (40.23 km/h)24.28 mph (39.07 km/h)
30 mph (48.28 km/h)29.14 mph (46.89 km/h)
35 mph (56.33 km/h)33.99 mph (54.7 km/h)
40 mph (64.37 km/h)38.85 mph (62.52 km/h)
45 mph (72.42 km/h)43.7 mph (70.33 km/h)
50 mph (80.47 km/h)48.56 mph (78.15 km/h)
55 mph (88.51 km/h)53.41 mph (85.96 km/h)
60 mph (96.56 km/h)58.27 mph (93.78 km/h)
65 mph (104.61 km/h)63.13 mph (101.59 km/h)
70 mph (112.65 km/h)67.98 mph (109.41 km/h)
75 mph (120.7 km/h)72.84 mph (117.22 km/h)
80 mph (128.75 km/h)77.69 mph (125.04 km/h)
85 mph (136.79 km/h)82.55 mph (132.85 km/h)
90 mph (144.84 km/h)87.41 mph (140.67 km/h)
95 mph (152.89 km/h)92.26 mph (148.48 km/h)
100 mph (160.93 km/h)97.12 mph (156.29 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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