I haven't had a spare tire on my motorcycles in my 47-years of riding. My newest bike comes with an inflator cartridge. I hope I never have to use it. I've sold BMWs (and Porsche, Audi, Jaguar . . . ) since 1976. We haven't had spares in new BMWs since around 2006. People seem to have gotten used to Run-Flat Technology tires as manufacturers continue to improve them. We have two models where a temporary spare is a $150 option. Very few take it. None of our M-cars have spares or run-flat tires. The have an inflator/sealer called an M-Mobility Kit. Can't think of anyone who's used one. I own a bunch of BMWs but all of them have full-sized spares on a matching fifth road-wheel. I can't think of the last time I've used one of those, either!