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 245/85r15 Tire Comparison Side By Side
  26/10-12 245/85-15 Difference
Diameter inches (mm) 26 (660.4) 31.4 (797.5) 5.4 (137.1) 20.8%
Width inches (mm) 10 (254) 9.65 (245) -0.35 (-9) -3.5%
Circum. inches (mm) 81.68 (2074.71) 98.64 (2505.42) 16.96 (430.71) 20.8%
Sidewall Height inches (mm) 7 (177.8) 8.2 (208.25) 1.2 (30.45) 17.1%
Revolutions per mile (km) 775.7 (481.99) 642.34 (399.13) -133.35 (-82.86) -17.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)24.15 mph (38.87 km/h)
25 mph (40.23 km/h)30.19 mph (48.59 km/h)
30 mph (48.28 km/h)36.23 mph (58.3 km/h)
35 mph (56.33 km/h)42.27 mph (68.02 km/h)
40 mph (64.37 km/h)48.3 mph (77.74 km/h)
45 mph (72.42 km/h)54.34 mph (87.46 km/h)
50 mph (80.47 km/h)60.38 mph (97.17 km/h)
55 mph (88.51 km/h)66.42 mph (106.89 km/h)
60 mph (96.56 km/h)72.46 mph (116.61 km/h)
65 mph (104.61 km/h)78.49 mph (126.32 km/h)
70 mph (112.65 km/h)84.53 mph (136.04 km/h)
75 mph (120.7 km/h)90.57 mph (145.76 km/h)
80 mph (128.75 km/h)96.61 mph (155.48 km/h)
85 mph (136.79 km/h)102.65 mph (165.19 km/h)
90 mph (144.84 km/h)108.68 mph (174.91 km/h)
95 mph (152.89 km/h)114.72 mph (184.63 km/h)
100 mph (160.93 km/h)120.76 mph (194.34 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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