Joined: Feb 2012
Posts: 19,352
Likes: 5,470
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
The "3" means a 68mm shell width (and a "5" is a 70mm shell). The "NL is the axle's lengths beyond the bearing tracks. The "81-1" is likely a date code. Andy
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AndrewRStewart