Joined: Feb 2012
Posts: 19,344
Likes: 5,461
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
I would hope that by looking down the length of the tube one could see any sleeve that's been inserted...
Moving to a 28.6 OD tube will need some small TT miter length increase (as well as SS length growth). While on paper there will be greater ST flex in real life the spoke tensions ot tire pressures will be greater an influence to ride feel.
Generally the tubing manufacturer isn't the one to install sleeves, that's the builder's work. I can't ever remembering seeing an un cut tube that had a pressed in (bonded?) sleeve direct from a supplier or manufacturer.
At about 1mm of sleeve wall thickness it wouldn't be too hard to turn one out and bond it in after the joint was completed. This sleeve could be steel (mild, for reaming/machining ease) or Al, I've even seen composite/plastic sleeves used. Andy
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AndrewRStewart