Quote Originally Posted by bluejeff
So, do you have any real data on the same model of racquet, in same U, but different in Grip size?

MP-100 3UG4 and 3UG5.

Even there is only a 1g difference, it is still counted as difference.
Some G5 weigh 1-2gm heavier than G4 of the same U classification and vice versa. Most of the U classifications are within the 5gm tolerance, but not all.