A rear derailleur is a mechanism that allows you to change and choose a sprocket/cog on the cassette on your rear wheel. The derailleur moves on a horizontal plane as you look at the rear wheel from above.
The ability to change gear conveniently and rapidly allows you to continue cycling in an efficient manor. A rear derailleur gives you a choice of gearing and the ability to use them through a gear lever.
Your choice of rear derailleur is based upon the gear levers your bike has. The cable is pulled in different amounts by different brands. So if you have Campagnolo gear levers then use a Campagnolo rear derailleur for the best compatibility. Also make sure you chose a rear derailleur suitable for the number of sprockets on your cassette.
Various derailleur systems were designed and built as far back as the late 1800s. A French bicycle tourist, writer and cycling promoter Paul De Vivie (1853-1930), invented a two speed rear derailleur in 1905 which he used on forays into the Alps, and we wonder if 20 gears are enough..... Since then there have been many advancements, in the number of gears, materials and reductions in weight. Wiggle lists a large selection of front and rear derailleurs catering for double and triple systems with 7, 8, 9, 10 and even 11 speed cassettes.
Wiggle Ltd. 1000 Lakeside, Suite 310, Third Floor N E Wing, Portsmouth, Hampshire, PO6 3EN, United Kingdom /
Company No: 2667809 /
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