Close-up of a touring bicycle's chaincase

A chaincase or chain guard is a guard which fits around a chain to protect the chain from dirt and other environmental hazards, and to protect operators from dirt and danger of trapping. Image File history File links Kettenschutz. ... Image File history File links Kettenschutz. ... Roller chain and sprocket A bicycle chain is a chain that transfers power from the pedals to the drive-wheel of a bicycle thus propelling it. ...

Chaincases are common on industrial machinery, early lawn mowers, and particularly on commuter bicycles, most notably in Germany and the Netherlands although historically many British roadsters were also fitted with chaincases. Bicycle commuting is the act of commuting to work or school by bicycle, a common form of utility cycling. ... A roadster is a type of bicycle once common in Britain and similar to the styles still seen in Germany, Denmark and the Netherlands - although Danish and Dutch bicycles tend to be distinctive, with (among other things) much higher handlebars. ...