Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
26/10r12 vs 27/9r12 Tire Comparison Side By Side
  26/10-12 27/9-12 Difference
Diameter inches (mm) 26 (660.4) 26.97 (684.94) 0.97 (24.54) 3.7%
Width inches (mm) 10 (254) 9.02 (229) -0.98 (-25) -9.8%
Circum. inches (mm) 81.68 (2074.71) 84.72 (2151.8) 3.04 (77.09) 3.7%
Sidewall Height inches (mm) 7 (177.8) 7.48 (190.07) 0.48 (12.27) 6.9%
Revolutions per mile (km) 775.7 (481.99) 747.91 (464.73) -27.79 (-17.27) -3.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.74 mph (33.38 km/h)
25 mph (40.23 km/h)25.93 mph (41.73 km/h)
30 mph (48.28 km/h)31.11 mph (50.07 km/h)
35 mph (56.33 km/h)36.3 mph (58.42 km/h)
40 mph (64.37 km/h)41.49 mph (66.77 km/h)
45 mph (72.42 km/h)46.67 mph (75.11 km/h)
50 mph (80.47 km/h)51.86 mph (83.46 km/h)
55 mph (88.51 km/h)57.04 mph (91.8 km/h)
60 mph (96.56 km/h)62.23 mph (100.15 km/h)
65 mph (104.61 km/h)67.42 mph (108.49 km/h)
70 mph (112.65 km/h)72.6 mph (116.84 km/h)
75 mph (120.7 km/h)77.79 mph (125.19 km/h)
80 mph (128.75 km/h)82.97 mph (133.53 km/h)
85 mph (136.79 km/h)88.16 mph (141.88 km/h)
90 mph (144.84 km/h)93.34 mph (150.22 km/h)
95 mph (152.89 km/h)98.53 mph (158.57 km/h)
100 mph (160.93 km/h)103.72 mph (166.91 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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