Just out of curiosity, what type of spare wheel do you guys carry in the trunk? I'm under the assumption that if someone bought 4 sets of larger wheels to upgrade from factory standard ones what contingency do you have if you had a puncture?
Even if you kept an OEM as spare wouldn't this affect the roll radius because of different wheel diameters?
Space savers is probably another option but again this issue about roll radius.
Do you carry a tyre repair kit?
Or do you not bother with a spare wheel and leave the trunk empty? A guy I know never carries a spare wheel because he wanted to save weight and he's never had an incident where he had to use a spare, hence reckons it's a very low risk.