Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/75r16 vs 235/80r16 Tire Comparison Side By Side
  245/75-16 235/80-16 Difference
Diameter inches (mm) 30.47 (773.9) 30.8 (782.4) 0.33 (8.5) 1.1%
Width inches (mm) 9.65 (245) 9.25 (235) -0.39 (-10) -4.1%
Circum. inches (mm) 95.72 (2431.28) 96.77 (2457.98) 1.05 (26.7) 1.1%
Sidewall Height inches (mm) 7.23 (183.75) 7.4 (188) 0.17 (4.25) 2.3%
Revolutions per mile (km) 661.93 (411.31) 654.74 (406.84) -7.19 (-4.47) -1.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.22 mph (32.54 km/h)
25 mph (40.23 km/h)25.27 mph (40.68 km/h)
30 mph (48.28 km/h)30.33 mph (48.81 km/h)
35 mph (56.33 km/h)35.38 mph (56.95 km/h)
40 mph (64.37 km/h)40.44 mph (65.08 km/h)
45 mph (72.42 km/h)45.49 mph (73.22 km/h)
50 mph (80.47 km/h)50.55 mph (81.35 km/h)
55 mph (88.51 km/h)55.6 mph (89.49 km/h)
60 mph (96.56 km/h)60.66 mph (97.62 km/h)
65 mph (104.61 km/h)65.71 mph (105.76 km/h)
70 mph (112.65 km/h)70.77 mph (113.89 km/h)
75 mph (120.7 km/h)75.82 mph (122.03 km/h)
80 mph (128.75 km/h)80.88 mph (130.16 km/h)
85 mph (136.79 km/h)85.93 mph (138.3 km/h)
90 mph (144.84 km/h)90.99 mph (146.43 km/h)
95 mph (152.89 km/h)96.04 mph (154.57 km/h)
100 mph (160.93 km/h)101.1 mph (162.7 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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