Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
26/11r12 vs 280/60r12 Tire Comparison Side By Side
  26/11-12 280/60-12 Difference
Diameter inches (mm) 26.06 (661.92) 25.23 (640.8) -0.83 (-21.12) -3.2%
Width inches (mm) 10.98 (279) 11.02 (280) 0.04 (1) 0.4%
Circum. inches (mm) 81.87 (2079.48) 79.26 (2013.13) -2.61 (-66.35) -3.2%
Sidewall Height inches (mm) 7.03 (178.56) 6.61 (168) -0.42 (-10.56) -5.9%
Revolutions per mile (km) 773.92 (480.89) 799.42 (496.74) 25.51 (15.85) 3.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.36 mph (31.16 km/h)
25 mph (40.23 km/h)24.2 mph (38.95 km/h)
30 mph (48.28 km/h)29.04 mph (46.74 km/h)
35 mph (56.33 km/h)33.88 mph (54.53 km/h)
40 mph (64.37 km/h)38.72 mph (62.32 km/h)
45 mph (72.42 km/h)43.56 mph (70.11 km/h)
50 mph (80.47 km/h)48.4 mph (77.9 km/h)
55 mph (88.51 km/h)53.25 mph (85.69 km/h)
60 mph (96.56 km/h)58.09 mph (93.48 km/h)
65 mph (104.61 km/h)62.93 mph (101.27 km/h)
70 mph (112.65 km/h)67.77 mph (109.06 km/h)
75 mph (120.7 km/h)72.61 mph (116.85 km/h)
80 mph (128.75 km/h)77.45 mph (124.64 km/h)
85 mph (136.79 km/h)82.29 mph (132.43 km/h)
90 mph (144.84 km/h)87.13 mph (140.22 km/h)
95 mph (152.89 km/h)91.97 mph (148.01 km/h)
100 mph (160.93 km/h)96.81 mph (155.8 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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