Next up, the tubeless version. I'm saving up already.

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Dr John,
I always appreciate your comments.
Any idea when Shimano might release them? I've had a 2008.5 Tarmac Pro w/ the Roval Fusee SL wheels since the end of July and will probably ride it recreationally for fitness (I like the rush!) 5000 miles / yr. After being off the bike for 20 years, I'm working to get stronger in the rolling hills of San Luis Obispo County (CA).
Any ideas as to what I might gain?