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 245/70r12 Tire Comparison Side By Side
  24/8-12 245/70-12 Difference
Diameter inches (mm) 23.99 (609.3) 25.5 (647.8) 1.52 (38.5) 6.3%
Width inches (mm) 7.99 (203) 9.65 (245) 1.65 (42) 20.7%
Circum. inches (mm) 75.36 (1914.17) 80.12 (2035.12) 4.76 (120.95) 6.3%
Sidewall Height inches (mm) 5.99 (152.25) 6.75 (171.5) 0.76 (19.25) 12.6%
Revolutions per mile (km) 840.75 (522.42) 790.78 (491.37) -49.97 (-31.05) -5.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.26 mph (34.22 km/h)
25 mph (40.23 km/h)26.58 mph (42.78 km/h)
30 mph (48.28 km/h)31.9 mph (51.33 km/h)
35 mph (56.33 km/h)37.21 mph (59.89 km/h)
40 mph (64.37 km/h)42.53 mph (68.44 km/h)
45 mph (72.42 km/h)47.84 mph (77 km/h)
50 mph (80.47 km/h)53.16 mph (85.55 km/h)
55 mph (88.51 km/h)58.48 mph (94.11 km/h)
60 mph (96.56 km/h)63.79 mph (102.66 km/h)
65 mph (104.61 km/h)69.11 mph (111.22 km/h)
70 mph (112.65 km/h)74.42 mph (119.77 km/h)
75 mph (120.7 km/h)79.74 mph (128.33 km/h)
80 mph (128.75 km/h)85.05 mph (136.88 km/h)
85 mph (136.79 km/h)90.37 mph (145.44 km/h)
90 mph (144.84 km/h)95.69 mph (153.99 km/h)
95 mph (152.89 km/h)101 mph (162.55 km/h)
100 mph (160.93 km/h)106.32 mph (171.1 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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