I've often noticed in recent times, long lines of balance weights, sometimes taking up as much as a third of a rims circumference, I assumed this was a result of shoddy Chinese tyres or maybe yet another surreal and life threatening scene fad, but look what I've found.
The top pair are 30 grammes, the lowers, 60. Why are some bigger? Because they're made of monkey metal rather than lead, the miserable cheap bastards. It's going to be fun when battery makers start turning that trick.