All mountain or xc application, wet or dry condition.
closed as too localized by Gary.Ray♦ Nov 29 '12 at 22:05
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According to weight weeniesthe Continental Speed King Supersonic is the lightest 2.3 or larger tire.
It's pretty unlikely that anyone keeps a list of weights for all the available tyres by width. Your best idea is to download the datasheets of brands/models you consider good enough (quality wise) and then compare the weights.