I just saw a post on a forum asking about proper tire pressure for a modern Vespa. Several people said “it’s on the tire, duh!” That seems like an obvious answer, but tires are usually designed for many applications, and that number is the MAXIMUM pressure the tire can handle, not the pressure for your vehicle. Filling to that pressure (on any vehicle, but especially on a scooter or motorcycle) can affect handling, traction, suspension, safety, and fuel efficiency. Modern vehicles always have a tire inflation sticker somewhere. On cars it’s almost always in the driver’s side door jamb. On motorcycles, it’s usually a sticker or metal plate on the swingarm or fork. On scooters, it’s usually a sticker in the glovebox or helmet bay. If you can’t find the sticker, consult the manual for proper pressures (If the sticker and manual contradict each other, go with the sticker, it’s more likely to be accurate for your specific bike/country). If you’re in a pinch and don’t have the data, it’s usually best to inflate it to several PSI below the “maximum” listed on the sidewall, then adjust to the proper PSI as soon as you can.