Andrew R Stewart
Join Date: Feb 2012
Location: 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, Raleigh Pro, Trek Cycle Cross, Mongoose tomac ATB, GT Bravado ATB, JCP Folder
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Well there is bracing already in the form of butting and lugs...
But as to bolt on braces, none that I know of. Because, IMO, a frame designer/builder would rather build a frame that can accept the loads that are intended in the riding. I would thing that a bolt on brace would have the ability to not fully stay secure and there will be small but not subtle, WRT adding stiffness, movement in the torsional plane.
AS I wrote this I do remember of one brace in the seat area. Motor pacing bikes have had a vertical bolt on brace from under the saddle's nose to the top of the top tube. I always thought that it was to insure that the saddle doesn't move under the significantly greater vertical loads that these bikes see on the high banks. Andy.