Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
27/8.5r14 vs 220/75r14 Tire Comparison Side By Side
  27/8.5-14 220/75-14 Difference
Diameter inches (mm) 26.93 (683.92) 26.99 (685.6) 0.07 (1.68) 0.2%
Width inches (mm) 8.5 (216) 8.66 (220) 0.16 (4) 1.9%
Circum. inches (mm) 84.59 (2148.6) 84.8 (2153.88) 0.21 (5.28) 0.2%
Sidewall Height inches (mm) 6.46 (164.16) 6.5 (165) 0.03 (0.84) 0.5%
Revolutions per mile (km) 749.02 (465.42) 747.19 (464.28) -1.84 (-1.14) -0.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.05 mph (32.27 km/h)
25 mph (40.23 km/h)25.06 mph (40.33 km/h)
30 mph (48.28 km/h)30.07 mph (48.4 km/h)
35 mph (56.33 km/h)35.09 mph (56.47 km/h)
40 mph (64.37 km/h)40.1 mph (64.53 km/h)
45 mph (72.42 km/h)45.11 mph (72.6 km/h)
50 mph (80.47 km/h)50.12 mph (80.67 km/h)
55 mph (88.51 km/h)55.14 mph (88.73 km/h)
60 mph (96.56 km/h)60.15 mph (96.8 km/h)
65 mph (104.61 km/h)65.16 mph (104.86 km/h)
70 mph (112.65 km/h)70.17 mph (112.93 km/h)
75 mph (120.7 km/h)75.18 mph (121 km/h)
80 mph (128.75 km/h)80.2 mph (129.06 km/h)
85 mph (136.79 km/h)85.21 mph (137.13 km/h)
90 mph (144.84 km/h)90.22 mph (145.2 km/h)
95 mph (152.89 km/h)95.23 mph (153.26 km/h)
100 mph (160.93 km/h)100.25 mph (161.33 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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