Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/45r19 vs 235/45r19 Tire Comparison Side By Side
  255/45-19 235/45-19 Difference
Diameter inches (mm) 28.04 (712.1) 27.33 (694.1) -0.71 (-18) -2.5%
Width inches (mm) 10.04 (255) 9.25 (235) -0.79 (-20) -7.8%
Circum. inches (mm) 88.08 (2237.13) 85.85 (2180.58) -2.23 (-56.55) -2.5%
Sidewall Height inches (mm) 4.52 (114.75) 4.16 (105.75) -0.35 (-9) -7.8%
Revolutions per mile (km) 719.38 (447) 738.04 (458.59) 18.66 (11.59) 2.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.49 mph (31.37 km/h)
25 mph (40.23 km/h)24.37 mph (39.22 km/h)
30 mph (48.28 km/h)29.24 mph (47.06 km/h)
35 mph (56.33 km/h)34.12 mph (54.9 km/h)
40 mph (64.37 km/h)38.99 mph (62.75 km/h)
45 mph (72.42 km/h)43.86 mph (70.59 km/h)
50 mph (80.47 km/h)48.74 mph (78.43 km/h)
55 mph (88.51 km/h)53.61 mph (86.28 km/h)
60 mph (96.56 km/h)58.48 mph (94.12 km/h)
65 mph (104.61 km/h)63.36 mph (101.96 km/h)
70 mph (112.65 km/h)68.23 mph (109.81 km/h)
75 mph (120.7 km/h)73.1 mph (117.65 km/h)
80 mph (128.75 km/h)77.98 mph (125.49 km/h)
85 mph (136.79 km/h)82.85 mph (133.34 km/h)
90 mph (144.84 km/h)87.73 mph (141.18 km/h)
95 mph (152.89 km/h)92.6 mph (149.02 km/h)
100 mph (160.93 km/h)97.47 mph (156.87 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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