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I have a TREK mountain bike with a Shimano combination brake and shifter with an Altus derailleur. It shifts all gears fine but when coasting with my feet on the pedals, the chain goes slack and sags several inches. Bike was damaged in a flood. I made repairs and had to remove wheels and replace inner tube, clean it up and lubricate chain. I did not remove the derailleur but something is obviously wrong. Is it possilbe that I got the chain wrap on the rear sprocket backward or what? I am stumped. Thanks

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Only YOU can evaluate any error you may have made. LOOK at why the chain is slack. Does the rear derailleur pull back to take up the slack? Are you using some ridiculous small chainring, small rear cog combination that allows too much chain to go slack?

Perhaps the freewheel isn't freewheeling and is instead feeding chain forward when you stop pedaling. Walk the bike forward and see if the rear cogs just coast. If not, lube time (internal). take it to a Bike Shop or buy all the special tools and DIY.

http://www.parktool.com/blog/repair-help/categories/derailleur-systems

http://www.parktool.com/blog/repair-help/categories/cassette-and-freewheel-service




Posted on Mar 22, 2011

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source: http://www.bikeforums.net/archive/index.php/t-83743.html

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