Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/75r19.5 vs 235/75r17.5 Tire Comparison Side By Side
  245/75-19.5 235/75-17.5 Difference
Diameter inches (mm) 33.97 (862.8) 31.38 (797) -2.59 (-65.8) -7.6%
Width inches (mm) 9.65 (245) 9.25 (235) -0.39 (-10) -4.1%
Circum. inches (mm) 106.72 (2710.57) 98.58 (2503.85) -8.14 (-206.72) -7.6%
Sidewall Height inches (mm) 7.23 (183.75) 6.94 (176.25) -0.3 (-7.5) -4.1%
Revolutions per mile (km) 593.73 (368.93) 642.75 (399.38) 49.02 (30.46) 8.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.47 mph (29.73 km/h)
25 mph (40.23 km/h)23.09 mph (37.17 km/h)
30 mph (48.28 km/h)27.71 mph (44.6 km/h)
35 mph (56.33 km/h)32.33 mph (52.03 km/h)
40 mph (64.37 km/h)36.95 mph (59.46 km/h)
45 mph (72.42 km/h)41.57 mph (66.9 km/h)
50 mph (80.47 km/h)46.19 mph (74.33 km/h)
55 mph (88.51 km/h)50.81 mph (81.76 km/h)
60 mph (96.56 km/h)55.42 mph (89.2 km/h)
65 mph (104.61 km/h)60.04 mph (96.63 km/h)
70 mph (112.65 km/h)64.66 mph (104.06 km/h)
75 mph (120.7 km/h)69.28 mph (111.5 km/h)
80 mph (128.75 km/h)73.9 mph (118.93 km/h)
85 mph (136.79 km/h)78.52 mph (126.36 km/h)
90 mph (144.84 km/h)83.14 mph (133.8 km/h)
95 mph (152.89 km/h)87.75 mph (141.23 km/h)
100 mph (160.93 km/h)92.37 mph (148.66 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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