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Some performance tyres have a red spot on the sidewall. This red spot is marked on the lightest part of the tyre. When fitting the tyre to the rim, the red dot is supposed to line up with the valve as this is the heaviest part. The weights should counteract each other giving a better balance before any weights are added.
I work on aircraft and this is where I know this from.
Had this at weekend with my new fronts. Went back and one was balanced at 0 but the other was sitting at 80! (Thats a long way off) Re-balanced and now fine.
Just stand there while they are balancing. Usually put the pressure on a bit...