Individual chains come with with extra links and hefty packaging, whereas pulling sections of chain from a large continuous spool eliminates waste and a portion of the cost. Often priced by the foot, spools of chain are available for most widths, from singlespeed up to the ubiquitous ten speed. The investment will save on more then the chains themselves. A worn-out chain not only wears down your chain-rings and cassette, but is also significantly less efficient than a new one.
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