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It is probably a small amount of damage to the sidewall of one of the tyres, this doesn't always show on a balance it just distorts the tread when...
I suspect you could also achieve maximum mass to energy transfer and vice versa. :) Or something like that.
It's a hobby now, I got out of the motor trade about 20 years ago when I realised that if you didn't know electronics then you didn't fix cars you...
