Joined: Feb 2012
Posts: 19,362
Likes: 5,503
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
Most likely for a rack or fender mount. I see no bolts though in the image, just a hole that probably has threads to accept a M5 bolt. Andy
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AndrewRStewart