Derailleur gears several standards in use, and in each the product of the derailleur's actuation ratio and the length of cable pulled must equal the pitch of the rear sprockets. The following standards exist. Some rear derailleurs, especially for mountain bikes, incorporate a clutch to keep the lower length of chain in sufficient tension to prevent the chain from striking the bottom of the chain stay, called "chain slap", and which can damage the chain stay. Clutches are also helpful in preventing the chain from derailing from the chain ring on systems without a front derailleur. The front derailleur only has to
The English Pug and the French Poodle The English Pug and the French Poodle The English Pug and the French Poodle, also known as The two Snobs, is an outdoor 2013 art installation with two bronze sculptures by Marc Andre J. Fortier, installed at 500 Place D'Armes in Montreal, in Quebec, Canada. "The English Pug and the French Poodle" is a privately owned monumental sculpture made by Montreal-born Canadian artist, Marc Andre Jacques Fortier. In the heart of Old-Montreal, Quebec, the diptych evokes, with humour, the cultural discords that used to prevail between the French and English Canadians. Inspired by the historical site of the building, the