Joined: Feb 2012
Posts: 19,373
Likes: 5,516
From: Rochester, NY
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
Sounds like when sizing the chain the first time you forgot to accommodate the amount needed to weave through the der. Or is this too simple an answer? IIRC the bike came with SunTour ders stock. If so then the der likely doesn't have a sprung upper pivot (the B pivot) and the pulley sits as far below the cogs as is needed to have the upper pulley clear the 32T cog and won't pivot up unless the B screw is employed. What we also don't really know is what the der's cage length is. A longer cage will require more chain. Andy