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The Freehub incorporates the ratchet mechanism into the hub body (although the ratchet mechanism is still replaceable).
The older Shimano cassette sprockets used a "twist-tooth" design, called "Uniglide." They had 9 identical splines (tabs) that would slide into matching grooves on the Freehub body.
Removing a freewheel is a chore, because pedaling tightens it onto the hub threads.
With a Freehub, on the other hand, once the sprockets are removed, the right hub flange is accessible for replacement of a broken spoke. The sprockets are commonly sold as a set, called a "cassette".
) a measure of the ability of a lens to pass light from an object to the image position, determined by the aperture and also the transmitting power of the lens.
It increases as the f-number is decreased and vice versa Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. 1979, 1986 © Harper Collins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Cite This Source "to succeed, prosper, advance" (see speed (n.)). If you wore out your sprockets, or wanted different gear ratios, you could unscrew the cluster and install a new one.