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Join Date: Feb 2012
Location: Rochester, NY
Posts: 18,056
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
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Don't make the mistake of connecting frame flex or weight with creating a faster (as in actual time to distance, not moment by moment perception) bike. There's sooo much more to how a bike/rider goes faster (or slower) then weight or flex.
I completely agree with Eric's suggestion to use thicker walls for the first (few) frames. Besides the aspect of overheating during the joining (especially with a lugged construction) the tubes have far less material that can be sacrificed under a file or sanding/blaster. Unless one has pretty good fabrication skills already most mentors will advise .8 or .9 tube walls at the joints for the first frames. Andy
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AndrewRStewart