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Yeah I've seen Sheldon's table. Did you find it noticeably flaky on corners?
(Academic question now since I am also a cautious type, I'm not doing it!)
hoefla-
It's quite few years ago now and I expect the tyres were pretty basic and that they were probably at too high a pressure, but I do remember thinking something didn't feel right: squirmy and unsettling, enough to make me swap them out.
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I ran 29mm on Mavic Aksium before, I have to inflate them a little more than I like to reduced that squirmy feel when cornering, it's only a little more comfortable than the 23mm it replaced despite bigger contact point.
I'd be better off with a 25/26mm tyres.
Having said that, a 25mm tyres on a wide rims (17mm internal) felt a lots closer to a 28mm at the same pressure without the squriming.
Scilly.Suffolk
edscoble
Sheldon's table here, so you can compare "doable" and "optimal".
Ultimately, you're the only person who can tell us whether you will feel it.
Personally I wouldn't mix skinny rims with 28mm tyres again, but I didn't die!
Or did I? Whoooo.....