Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
24/8r12 vs 205/75r12 Tire Comparison Side By Side
  24/8-12 205/75-12 Difference
Diameter inches (mm) 23.99 (609.3) 24.11 (612.3) 0.12 (3) 0.5%
Width inches (mm) 7.99 (203) 8.07 (205) 0.08 (2) 1%
Circum. inches (mm) 75.36 (1914.17) 75.73 (1923.6) 0.37 (9.42) 0.5%
Sidewall Height inches (mm) 5.99 (152.25) 6.05 (153.75) 0.06 (1.5) 1%
Revolutions per mile (km) 840.75 (522.42) 836.63 (519.86) -4.12 (-2.56) -0.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.1 mph (32.35 km/h)
25 mph (40.23 km/h)25.12 mph (40.43 km/h)
30 mph (48.28 km/h)30.15 mph (48.52 km/h)
35 mph (56.33 km/h)35.17 mph (56.6 km/h)
40 mph (64.37 km/h)40.2 mph (64.69 km/h)
45 mph (72.42 km/h)45.22 mph (72.78 km/h)
50 mph (80.47 km/h)50.25 mph (80.86 km/h)
55 mph (88.51 km/h)55.27 mph (88.95 km/h)
60 mph (96.56 km/h)60.3 mph (97.04 km/h)
65 mph (104.61 km/h)65.32 mph (105.12 km/h)
70 mph (112.65 km/h)70.34 mph (113.21 km/h)
75 mph (120.7 km/h)75.37 mph (121.3 km/h)
80 mph (128.75 km/h)80.39 mph (129.38 km/h)
85 mph (136.79 km/h)85.42 mph (137.47 km/h)
90 mph (144.84 km/h)90.44 mph (145.55 km/h)
95 mph (152.89 km/h)95.47 mph (153.64 km/h)
100 mph (160.93 km/h)100.49 mph (161.73 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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