by v7guy » Wed Aug 06, 2014 6:24 pm
In the diagram Moots posted it shows the belts, the picture is an example of a snapped belt. The belts can also shift side to side in a bad tire. It should be visibly apparent though.
I'd say those two tires need replaced and are defective in some fashion, I'd take em back to where you got em and request replacements. There's really not anything else it could be since you're saying they're showing unbalanced on the machine repeatedly after previously balancing not once, but multiple times and you've verified the wheels are true and the tires aren't slipping on the wheel.
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