Often frowned upon as unnecessary weight by racing cyclists, but very popular with the person doing the laundry. A chainguard made of plastic or aluminium is very practical on everyday bikes because it prevents the right trouser leg from getting oily or even torn by the chainring. You can cover just the front chainrings, or you can get chainguards which cover the entire length of the chain.
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Chain guard clamp
Chain guard front part
Chain guard ring
Chain guard ring for Bosch 1st and 3rd generation motors, as well as Brose