Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/85r16 vs 235/85r16 Tire Comparison Side By Side
  245/85-16 235/85-16 Difference
Diameter inches (mm) 32.4 (822.9) 31.73 (805.9) -0.67 (-17) -2.1%
Width inches (mm) 9.65 (245) 9.25 (235) -0.39 (-10) -4.1%
Circum. inches (mm) 101.78 (2585.22) 99.68 (2531.81) -2.1 (-53.41) -2.1%
Sidewall Height inches (mm) 8.2 (208.25) 7.86 (199.75) -0.33 (-8.5) -4.1%
Revolutions per mile (km) 622.52 (386.81) 635.65 (394.97) 13.13 (8.16) 2.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.59 mph (31.52 km/h)
25 mph (40.23 km/h)24.48 mph (39.4 km/h)
30 mph (48.28 km/h)29.38 mph (47.28 km/h)
35 mph (56.33 km/h)34.28 mph (55.16 km/h)
40 mph (64.37 km/h)39.17 mph (63.04 km/h)
45 mph (72.42 km/h)44.07 mph (70.92 km/h)
50 mph (80.47 km/h)48.97 mph (78.81 km/h)
55 mph (88.51 km/h)53.86 mph (86.69 km/h)
60 mph (96.56 km/h)58.76 mph (94.57 km/h)
65 mph (104.61 km/h)63.66 mph (102.45 km/h)
70 mph (112.65 km/h)68.55 mph (110.33 km/h)
75 mph (120.7 km/h)73.45 mph (118.21 km/h)
80 mph (128.75 km/h)78.35 mph (126.09 km/h)
85 mph (136.79 km/h)83.24 mph (133.97 km/h)
90 mph (144.84 km/h)88.14 mph (141.85 km/h)
95 mph (152.89 km/h)93.04 mph (149.73 km/h)
100 mph (160.93 km/h)97.93 mph (157.61 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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