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 270/60r12 Tire Comparison Side By Side
  26/11-12 270/60-12 Difference
Diameter inches (mm) 26.06 (661.92) 24.76 (628.8) -1.3 (-33.12) -5%
Width inches (mm) 10.98 (279) 10.63 (270) -0.35 (-9) -3.2%
Circum. inches (mm) 81.87 (2079.48) 77.77 (1975.43) -4.1 (-104.05) -5%
Sidewall Height inches (mm) 7.03 (178.56) 6.38 (162) -0.65 (-16.56) -9.3%
Revolutions per mile (km) 773.92 (480.89) 814.68 (506.22) 40.76 (25.33) 5.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19 mph (30.58 km/h)
25 mph (40.23 km/h)23.75 mph (38.22 km/h)
30 mph (48.28 km/h)28.5 mph (45.86 km/h)
35 mph (56.33 km/h)33.25 mph (53.51 km/h)
40 mph (64.37 km/h)38 mph (61.15 km/h)
45 mph (72.42 km/h)42.75 mph (68.8 km/h)
50 mph (80.47 km/h)47.5 mph (76.44 km/h)
55 mph (88.51 km/h)52.25 mph (84.09 km/h)
60 mph (96.56 km/h)57 mph (91.73 km/h)
65 mph (104.61 km/h)61.75 mph (99.37 km/h)
70 mph (112.65 km/h)66.5 mph (107.02 km/h)
75 mph (120.7 km/h)71.25 mph (114.66 km/h)
80 mph (128.75 km/h)76 mph (122.31 km/h)
85 mph (136.79 km/h)80.75 mph (129.95 km/h)
90 mph (144.84 km/h)85.5 mph (137.59 km/h)
95 mph (152.89 km/h)90.25 mph (145.24 km/h)
100 mph (160.93 km/h)95 mph (152.88 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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