Asuming BMW have got their magical 50 / 50 weight distribution, that s 1100 KG over the rear, 3 100KG adults in the Rear and 100 KG luggage and the max 50 KG load through the tow ball then you have 1550 KG out of 1900 KG, 350 KG safty margin, i am almost only ever one up and Labrador so my next tyres are Dymaris, I already have the space saver spare. Am acident investigator, the ones i ave seen looking at damaged cars look at the tread and the quality of the tyre.

I think BMW only put 110's on incase you are fully loaded and then overloaded and doing the max 155MPH for 2 hours on their autobarns.