Join Date: Jun 2005
Location: Pagosa Springs, CO, USA
Bikes: Road, MTB, Cruiser, Chopper, BMX
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It sounds to me that you may have over-rotated the derailleur.
Where the derailleur mounts to the frame, there is a flat metal bracket that has a screw, the "B-tension" screw, and a small tab bent at a 90 degree angle. As the derailleur knuckle rotates, the tab butts up against a lobe on the knuckle and prevents the internal derailleur spring from rotating past the lobe...most of the time. Tangling the chain by backing up the bike while a gear has been shifted but not yet moved to the next gear can bend the tab and allow the tab to slip past the lobe. If it is not too damaged, you can often rotate the derailleur back, and with a punch, peen down that tab again until it holds.
Originally Posted by ahsposo
Ski, bike and wish I was gay.