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
Yiddish words used in English sometimes in the same sentence. For instance, the word פֿאַרקאַקטע may be spelled "farkakte", "ferkockte", "verkackte", among others. In its roots, though, Yiddish (whether used as English slang or not) is fundamentally mediaeval High German; although mediaeval German suffered from the same vagaries in spelling, it later became standardised in Modern High German. This list shall use the same conventions as Modern High German, with the exception of certain words, the spellings of which have been standardised. Furthermore, common nouns shall be left lowercase, as in English. Yiddish words used in English Yiddish words may be used in a primarily