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 205/80r12 Tire Comparison Side By Side
  26/11-12 205/80-12 Difference
Diameter inches (mm) 26.06 (661.92) 24.91 (632.8) -1.15 (-29.12) -4.4%
Width inches (mm) 10.98 (279) 8.07 (205) -2.91 (-74) -26.5%
Circum. inches (mm) 81.87 (2079.48) 78.27 (1988) -3.6 (-91.48) -4.4%
Sidewall Height inches (mm) 7.03 (178.56) 6.46 (164) -0.57 (-14.56) -8.2%
Revolutions per mile (km) 773.92 (480.89) 809.53 (503.02) 35.61 (22.13) 4.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.12 mph (30.77 km/h)
25 mph (40.23 km/h)23.9 mph (38.46 km/h)
30 mph (48.28 km/h)28.68 mph (46.16 km/h)
35 mph (56.33 km/h)33.46 mph (53.85 km/h)
40 mph (64.37 km/h)38.24 mph (61.54 km/h)
45 mph (72.42 km/h)43.02 mph (69.23 km/h)
50 mph (80.47 km/h)47.8 mph (76.93 km/h)
55 mph (88.51 km/h)52.58 mph (84.62 km/h)
60 mph (96.56 km/h)57.36 mph (92.31 km/h)
65 mph (104.61 km/h)62.14 mph (100.01 km/h)
70 mph (112.65 km/h)66.92 mph (107.7 km/h)
75 mph (120.7 km/h)71.7 mph (115.39 km/h)
80 mph (128.75 km/h)76.48 mph (123.08 km/h)
85 mph (136.79 km/h)81.26 mph (130.78 km/h)
90 mph (144.84 km/h)86.04 mph (138.47 km/h)
95 mph (152.89 km/h)90.82 mph (146.16 km/h)
100 mph (160.93 km/h)95.6 mph (153.85 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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