Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/50r19 vs 245/45r19 Tire Comparison Side By Side
  235/50-19 245/45-19 Difference
Diameter inches (mm) 28.25 (717.6) 27.68 (703.1) -0.57 (-14.5) -2%
Width inches (mm) 9.25 (235) 9.65 (245) 0.39 (10) 4.3%
Circum. inches (mm) 88.76 (2254.41) 86.96 (2208.85) -1.79 (-45.55) -2%
Sidewall Height inches (mm) 4.63 (117.5) 4.34 (110.25) -0.29 (-7.25) -6.2%
Revolutions per mile (km) 713.87 (443.57) 728.59 (452.72) 14.72 (9.15) 2.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.6 mph (31.54 km/h)
25 mph (40.23 km/h)24.49 mph (39.42 km/h)
30 mph (48.28 km/h)29.39 mph (47.3 km/h)
35 mph (56.33 km/h)34.29 mph (55.19 km/h)
40 mph (64.37 km/h)39.19 mph (63.07 km/h)
45 mph (72.42 km/h)44.09 mph (70.96 km/h)
50 mph (80.47 km/h)48.99 mph (78.84 km/h)
55 mph (88.51 km/h)53.89 mph (86.73 km/h)
60 mph (96.56 km/h)58.79 mph (94.61 km/h)
65 mph (104.61 km/h)63.69 mph (102.49 km/h)
70 mph (112.65 km/h)68.59 mph (110.38 km/h)
75 mph (120.7 km/h)73.48 mph (118.26 km/h)
80 mph (128.75 km/h)78.38 mph (126.15 km/h)
85 mph (136.79 km/h)83.28 mph (134.03 km/h)
90 mph (144.84 km/h)88.18 mph (141.91 km/h)
95 mph (152.89 km/h)93.08 mph (149.8 km/h)
100 mph (160.93 km/h)97.98 mph (157.68 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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