Joined: Feb 2012
Posts: 19,290
Likes: 5,383
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
Three possibilities come to my mind. The seam's plug could have come loose, like many Mavics. A spoke hole eyelet could be loose. The valve could be tapping against the rim valve hole. On a 14 year old wheel I wouldn't be surprised at it's starting to "wear out". Andy.