Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
285/30r20 vs 255/35r20 Tire Comparison Side By Side
  285/30-20 255/35-20 Difference
Diameter inches (mm) 26.73 (679) 27.03 (686.5) 0.3 (7.5) 1.1%
Width inches (mm) 11.22 (285) 10.04 (255) -1.18 (-30) -10.5%
Circum. inches (mm) 83.98 (2133.14) 84.91 (2156.7) 0.93 (23.56) 1.1%
Sidewall Height inches (mm) 3.37 (85.5) 3.51 (89.25) 0.15 (3.75) 4.4%
Revolutions per mile (km) 754.45 (468.79) 746.21 (463.67) -8.24 (-5.12) -1.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.22 mph (32.54 km/h)
25 mph (40.23 km/h)25.28 mph (40.68 km/h)
30 mph (48.28 km/h)30.33 mph (48.81 km/h)
35 mph (56.33 km/h)35.39 mph (56.95 km/h)
40 mph (64.37 km/h)40.44 mph (65.08 km/h)
45 mph (72.42 km/h)45.5 mph (73.22 km/h)
50 mph (80.47 km/h)50.55 mph (81.36 km/h)
55 mph (88.51 km/h)55.61 mph (89.49 km/h)
60 mph (96.56 km/h)60.66 mph (97.63 km/h)
65 mph (104.61 km/h)65.72 mph (105.76 km/h)
70 mph (112.65 km/h)70.77 mph (113.9 km/h)
75 mph (120.7 km/h)75.83 mph (122.03 km/h)
80 mph (128.75 km/h)80.88 mph (130.17 km/h)
85 mph (136.79 km/h)85.94 mph (138.31 km/h)
90 mph (144.84 km/h)90.99 mph (146.44 km/h)
95 mph (152.89 km/h)96.05 mph (154.58 km/h)
100 mph (160.93 km/h)101.1 mph (162.71 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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