Derailleur gears by 13 drive-train. Most road bicycles have two chainrings, and touring bicycles commonly have three. The rear derailleur serves double duty: moving the chain between rear sprockets and taking up chain slack caused by moving to a smaller sprocket at the rear or a smaller chainring by the front derailleur. In order to accomplish this second task, it is positioned in the path of the bottom, slack portion of chain. Sometimes the rear-derailleurs are re-purposed as chain tensioners for single-speed bicycles that cannot adjust chain tension by a different method. Although variations exist, as noted below, most rear derailleurs have
Influence of French on English linguist Henriette Walter, words of French origin represent more than two thirds of the English vocabulary. It is estimated by linguist Anthony Lacoudre that over 40 000 English words are directly French and may be understood without orthographical change by French speakers. At the beginning of 11th century, the English language did not have a well-defined status. Indeed, the inhabitants of what would become Great Britain did not have a language that allowed them to communicate with each other. There were many different dialectal forms. Great Britain, in which various Celtic idioms had coexisted since the fourth century, had experienced