Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
265/65r17 vs 285/70r17 Tire Comparison Side By Side
  265/65-17 285/70-17 Difference
Diameter inches (mm) 30.56 (776.3) 32.71 (830.8) 2.15 (54.5) 7%
Width inches (mm) 10.43 (265) 11.22 (285) 0.79 (20) 7.5%
Circum. inches (mm) 96.02 (2438.82) 102.76 (2610.04) 6.74 (171.22) 7%
Sidewall Height inches (mm) 6.78 (172.25) 7.85 (199.5) 1.07 (27.25) 15.8%
Revolutions per mile (km) 659.89 (410.03) 616.6 (383.14) -43.29 (-26.9) -6.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.4 mph (34.45 km/h)
25 mph (40.23 km/h)26.76 mph (43.06 km/h)
30 mph (48.28 km/h)32.11 mph (51.67 km/h)
35 mph (56.33 km/h)37.46 mph (60.28 km/h)
40 mph (64.37 km/h)42.81 mph (68.89 km/h)
45 mph (72.42 km/h)48.16 mph (77.5 km/h)
50 mph (80.47 km/h)53.51 mph (86.12 km/h)
55 mph (88.51 km/h)58.86 mph (94.73 km/h)
60 mph (96.56 km/h)64.21 mph (103.34 km/h)
65 mph (104.61 km/h)69.56 mph (111.95 km/h)
70 mph (112.65 km/h)74.91 mph (120.56 km/h)
75 mph (120.7 km/h)80.27 mph (129.17 km/h)
80 mph (128.75 km/h)85.62 mph (137.79 km/h)
85 mph (136.79 km/h)90.97 mph (146.4 km/h)
90 mph (144.84 km/h)96.32 mph (155.01 km/h)
95 mph (152.89 km/h)101.67 mph (163.62 km/h)
100 mph (160.93 km/h)107.02 mph (172.23 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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