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Join Date: Feb 2006
Location: Sin City, Nevada
Posts: 2,886
Bikes: Catrike 700, Greenspeed GTO trike, , Linear LWB recumbent, Haluzak Horizon SWB recumbent, Balance 450 MTB, Cannondale SM800 Beast of the East
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Buy an extra master link and add back enough links to bring the rear derailleur back underneath the cassette if you kept the rest of the chain. A normal chain is 116 links with the master link. If you don't have any more chain left it is time to just buy a new one. Remember the chain has to match the number of gears in the back. Six, seven, and eight speed are all one chain but 9 speed and above use different chains and different master links. Here in the US an 8 speed KMC chain costs about $14 on eBay but since you are using metric measurements you are probably not in the US. Then follow the directions on Park Tool to adjust it properly.