Load weight rating - different across models?

[MrBadger]

I was looking at the weight rating inside front door of a M3 euro spec car at UK dealership on 19" wheels.

I thought that it was a bit low at 375kg / 828lb - max combined weight of occupants and cargo.

I was wondering if it varied depending on the originally fitted wheels/tyres? Interested to what it says for LR AWD on standard 18" wheels, hoping its a little bit more than the 19" below. We have ordered tow hitch for bike rack and often carry lead acid batteries for an electric car we race.

Info I have wrt tyre load/speed on supplied tyres
18" 98W - 750kg
19" 96W - 710kg 235/40R19
20" 92Y - 630kg

 

[MrBadger]

Anyone? Just a matter of checking stickers inside drivers door, or where ever it is in other markets.

Difference in apparent weight rating between 19" and 18" tyres should in theory be enough to raise occupant and cargo rating to 500kg or more, which is more like it.