as witnessed (and shot) a couple of days ago at a scooter trip in Cuba:
step1: watering the tire in order to find the spot (so far, so good)
step 2 (photo1 – click to enlarge): „marking“ the spot (and preparing it for the condom), unwrapping the condom:
step 3 (photo 2): penetrating the tire with the condom (penetration is what the condom was made for in the first place anyway, right?):
step4 (photo3): adjusting the condom: DONE !