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 205/60r12 Tire Comparison Side By Side
  24/8-12 205/60-12 Difference
Diameter inches (mm) 23.99 (609.3) 21.69 (550.8) -2.3 (-58.5) -9.6%
Width inches (mm) 7.99 (203) 8.07 (205) 0.08 (2) 1%
Circum. inches (mm) 75.36 (1914.17) 68.13 (1730.39) -7.24 (-183.78) -9.6%
Sidewall Height inches (mm) 5.99 (152.25) 4.84 (123) -1.15 (-29.25) -19.2%
Revolutions per mile (km) 840.75 (522.42) 930.05 (577.9) 89.3 (55.49) 10.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.08 mph (29.1 km/h)
25 mph (40.23 km/h)22.6 mph (36.37 km/h)
30 mph (48.28 km/h)27.12 mph (43.64 km/h)
35 mph (56.33 km/h)31.64 mph (50.92 km/h)
40 mph (64.37 km/h)36.16 mph (58.19 km/h)
45 mph (72.42 km/h)40.68 mph (65.47 km/h)
50 mph (80.47 km/h)45.2 mph (72.74 km/h)
55 mph (88.51 km/h)49.72 mph (80.02 km/h)
60 mph (96.56 km/h)54.24 mph (87.29 km/h)
65 mph (104.61 km/h)58.76 mph (94.56 km/h)
70 mph (112.65 km/h)63.28 mph (101.84 km/h)
75 mph (120.7 km/h)67.8 mph (109.11 km/h)
80 mph (128.75 km/h)72.32 mph (116.39 km/h)
85 mph (136.79 km/h)76.84 mph (123.66 km/h)
90 mph (144.84 km/h)81.36 mph (130.93 km/h)
95 mph (152.89 km/h)85.88 mph (138.21 km/h)
100 mph (160.93 km/h)90.4 mph (145.48 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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