"Uh-uh. Respek Knuckles."
Join Date: Jun 2005
Location: CA
Posts: 1,094
Bikes: '06 LeMond Versailles, '04 S&M Beringer, '03 Quamen Bowls, '68 Raleigh Grand Prix (converted to fixed gear)
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cassette = internal drive, contained inside the hub
freewheel = external drive, threads onto the hub
The advantages of a cassette hub are lighter weight, stronger mechanism and the ability to run teeny tiny (9t) cogs in the rear. The disadvantages are $$$. In the immortal words of Keith Bontrager, "Strong, lightweight, inexpensive. Pick any two."