This seems like an excellent idea for a spare tire, since those usually only lie around for a long time in the boot, and when they do get used it's expected tha

This seems like an excellent idea for a spare tire, since those usually only lie around for a long time in the boot, and when they do get used it's expected that they don't perform exactly as the regular tires. For some reason though, it seems like a lot of car manufacturers are moving away from spare tires to things like "car puncture kits" that fill your tire with foam or something. If the recycling of tires was abysmal before, something like that seems like it would make it even worse.