Load rating is a standardised test to find a safe load rating for a tyre. A tyres diameter, width and construction of carcass will dictate the final load rating.

The load rating shown on the side wall is the load of one tyre. Two tyres of a motor vehicle effectively doubles the load rating of a Scooter. These load ratings are more than adequate spreading the load over two tyres even fully loaded up with two people and baggage.

No not really, load ratings are over safe and its doubtful you could over load a scooter and safely ride it anyway. Schwalbes lowest load rating is code 50 which is 190kg per tyre, 380kg total weight. This could equate to two fat blokes of 20 stone each and the scooter, can two 20 stone blokes fit on a scooter? If they could the tyres can still take the load.