Hopefully I won't get negative rep for not posting a pic of my scale (crappy camera, scale readout very small).
Just weighed a new 29x2.0 tire several times on mine and a friends scale, even calibrated and checked against a US nickel (5 grams): Specialized Bicycle Components
Specialized is one of the few companies with tires coming in under claimed weight. This particular tire is 542 grams! Claimed weight is 630 grams. I've had tires (Schwalbe) come in 80 grams over claimed, but never more than 80 under.
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