Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
24/8r12 vs 150/70r12 Tire Comparison Side By Side
  24/8-12 150/70-12 Difference
Diameter inches (mm) 23.99 (609.3) 20.27 (514.8) -3.72 (-94.5) -15.5%
Width inches (mm) 7.99 (203) 5.91 (150) -2.09 (-53) -26.1%
Circum. inches (mm) 75.36 (1914.17) 63.67 (1617.29) -11.69 (-296.88) -15.5%
Sidewall Height inches (mm) 5.99 (152.25) 4.13 (105) -1.86 (-47.25) -31%
Revolutions per mile (km) 840.75 (522.42) 995.09 (618.32) 154.33 (95.9) 18.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)16.9 mph (27.19 km/h)
25 mph (40.23 km/h)21.12 mph (33.99 km/h)
30 mph (48.28 km/h)25.35 mph (40.79 km/h)
35 mph (56.33 km/h)29.57 mph (47.59 km/h)
40 mph (64.37 km/h)33.8 mph (54.39 km/h)
45 mph (72.42 km/h)38.02 mph (61.19 km/h)
50 mph (80.47 km/h)42.25 mph (67.99 km/h)
55 mph (88.51 km/h)46.47 mph (74.79 km/h)
60 mph (96.56 km/h)50.69 mph (81.58 km/h)
65 mph (104.61 km/h)54.92 mph (88.38 km/h)
70 mph (112.65 km/h)59.14 mph (95.18 km/h)
75 mph (120.7 km/h)63.37 mph (101.98 km/h)
80 mph (128.75 km/h)67.59 mph (108.78 km/h)
85 mph (136.79 km/h)71.82 mph (115.58 km/h)
90 mph (144.84 km/h)76.04 mph (122.38 km/h)
95 mph (152.89 km/h)80.27 mph (129.18 km/h)
100 mph (160.93 km/h)84.49 mph (135.97 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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