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@GA2G
Bontrager Race Lite TT 700x19. Options do seem a bit thin on the ground though. Info.
Hutchinson Intensive is now available in 2 clincher guises - the normal tubed version, and a new tubeless version.
The tubeless version is 320grams, but with no tube, isn't so bad. It repairs with Fast'Air (spray sealant), or externally with Rep'air quick-dry glue.
The FastAir sealant can be used preventatively, so that any puncture up to 1mm, is filled automatically. Larger punctures can be sealed by removing the tyre, and fixing with patch and quick-dry glue. A special tyre lever called the Hutchinson Stick'Air, is possibly necessary for fitting the tyres. Obviously this appears to be a real task, because the tyre lever exudes soapy water, to help slide the tyre on, and maybe off too.
Interesting concept design. The special tyre lever is what differentiates this from Tufo tubular clinchers. Tufo are also lighter and more race-oriented, less commuter oriented, though the Hutchinson also have serious race credentials. Hutchinson also have a lighter, racier Atom. Weirdly, all reports say the Atom fits with ease, and not even needing tyre levers. Almost a loose, but good fit. Maybe the Hutchinson engineers predicted more difficulties than actually transpired.