Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
265/50r20 vs 285/70r17 Tire Comparison Side By Side
  265/50-20 285/70-17 Difference
Diameter inches (mm) 30.43 (773) 32.71 (830.8) 2.28 (57.8) 7.5%
Width inches (mm) 10.43 (265) 11.22 (285) 0.79 (20) 7.5%
Circum. inches (mm) 95.61 (2428.45) 102.76 (2610.04) 7.15 (181.58) 7.5%
Sidewall Height inches (mm) 5.22 (132.5) 7.85 (199.5) 2.64 (67) 50.6%
Revolutions per mile (km) 662.7 (411.78) 616.6 (383.14) -46.11 (-28.65) -7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.5 mph (34.59 km/h)
25 mph (40.23 km/h)26.87 mph (43.24 km/h)
30 mph (48.28 km/h)32.24 mph (51.89 km/h)
35 mph (56.33 km/h)37.62 mph (60.54 km/h)
40 mph (64.37 km/h)42.99 mph (69.19 km/h)
45 mph (72.42 km/h)48.36 mph (77.84 km/h)
50 mph (80.47 km/h)53.74 mph (86.48 km/h)
55 mph (88.51 km/h)59.11 mph (95.13 km/h)
60 mph (96.56 km/h)64.49 mph (103.78 km/h)
65 mph (104.61 km/h)69.86 mph (112.43 km/h)
70 mph (112.65 km/h)75.23 mph (121.08 km/h)
75 mph (120.7 km/h)80.61 mph (129.73 km/h)
80 mph (128.75 km/h)85.98 mph (138.37 km/h)
85 mph (136.79 km/h)91.36 mph (147.02 km/h)
90 mph (144.84 km/h)96.73 mph (155.67 km/h)
95 mph (152.89 km/h)102.1 mph (164.32 km/h)
100 mph (160.93 km/h)107.48 mph (172.97 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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