Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
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26/10r12 vs 280/70r12 Tire Comparison Side By Side
  26/10-12 280/70-12 Difference
Diameter inches (mm) 26 (660.4) 27.43 (696.8) 1.43 (36.4) 5.5%
Width inches (mm) 10 (254) 11.02 (280) 1.02 (26) 10.2%
Circum. inches (mm) 81.68 (2074.71) 86.18 (2189.06) 4.5 (114.35) 5.5%
Sidewall Height inches (mm) 7 (177.8) 7.72 (196) 0.72 (18.2) 10.2%
Revolutions per mile (km) 775.7 (481.99) 735.18 (456.82) -40.52 (-25.18) -5.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.1 mph (33.96 km/h)
25 mph (40.23 km/h)26.38 mph (42.45 km/h)
30 mph (48.28 km/h)31.65 mph (50.94 km/h)
35 mph (56.33 km/h)36.93 mph (59.43 km/h)
40 mph (64.37 km/h)42.2 mph (67.92 km/h)
45 mph (72.42 km/h)47.48 mph (76.41 km/h)
50 mph (80.47 km/h)52.76 mph (84.9 km/h)
55 mph (88.51 km/h)58.03 mph (93.39 km/h)
60 mph (96.56 km/h)63.31 mph (101.88 km/h)
65 mph (104.61 km/h)68.58 mph (110.37 km/h)
70 mph (112.65 km/h)73.86 mph (118.86 km/h)
75 mph (120.7 km/h)79.13 mph (127.35 km/h)
80 mph (128.75 km/h)84.41 mph (135.84 km/h)
85 mph (136.79 km/h)89.69 mph (144.33 km/h)
90 mph (144.84 km/h)94.96 mph (152.82 km/h)
95 mph (152.89 km/h)100.24 mph (161.31 km/h)
100 mph (160.93 km/h)105.51 mph (169.81 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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