FWIW: I think the widest tire available in 650C is the 650 x 28C Terry Tellus:
Amazon.com : Terry TellusTire 650x28 w /Puncture Protection Black : Bike Tires : Sports & Outdoors . Oddly, this isn't listed in the Terry catalog. Maybe they're not making them anymore.
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Jeff Wills
Comcast nuked my web page. It will return soon..