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 235/70r12 Tire Comparison Side By Side
  24/8-12 235/70-12 Difference
Diameter inches (mm) 23.99 (609.3) 24.95 (633.8) 0.96 (24.5) 4%
Width inches (mm) 7.99 (203) 9.25 (235) 1.26 (32) 15.8%
Circum. inches (mm) 75.36 (1914.17) 78.39 (1991.14) 3.03 (76.97) 4%
Sidewall Height inches (mm) 5.99 (152.25) 6.48 (164.5) 0.48 (12.25) 8%
Revolutions per mile (km) 840.75 (522.42) 808.25 (502.22) -32.5 (-20.19) -3.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.8 mph (33.48 km/h)
25 mph (40.23 km/h)26.01 mph (41.85 km/h)
30 mph (48.28 km/h)31.21 mph (50.22 km/h)
35 mph (56.33 km/h)36.41 mph (58.59 km/h)
40 mph (64.37 km/h)41.61 mph (66.96 km/h)
45 mph (72.42 km/h)46.81 mph (75.33 km/h)
50 mph (80.47 km/h)52.01 mph (83.7 km/h)
55 mph (88.51 km/h)57.21 mph (92.07 km/h)
60 mph (96.56 km/h)62.41 mph (100.44 km/h)
65 mph (104.61 km/h)67.61 mph (108.81 km/h)
70 mph (112.65 km/h)72.81 mph (117.18 km/h)
75 mph (120.7 km/h)78.02 mph (125.55 km/h)
80 mph (128.75 km/h)83.22 mph (133.92 km/h)
85 mph (136.79 km/h)88.42 mph (142.3 km/h)
90 mph (144.84 km/h)93.62 mph (150.67 km/h)
95 mph (152.89 km/h)98.82 mph (159.04 km/h)
100 mph (160.93 km/h)104.02 mph (167.41 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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