More tire-sizing updates

Four "650" tire sizes -- photo thansk to Aaron Goss of Aaron's Bke Repair. — Four “650” tire sizes — photo thanks to Aaron Goss of Aaron’s Bicycle Repair.

http://sheldonbrown.com/650b.html : added more info on “27 five” tires, and a photo (thanks to Aaron Goss!).

http://sheldonbrown.com/tire-sizing.html : added several tire sizes

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