2.50/2.75-10 Straight valve stem Premium quality 2.50/2.75-10 scooter inner tube with straight valve stem Premium quality inner tube from BikeMaster, Kings Tire, or other high quality manufacturerDescription 2.50/2.75-10 scooter inner tube with straight valve stem. Premium quality inner tube from BikeMaster, Kings Tire, or other high quality manufacturer. Large inner tube typically used on full size street legal scooters and bikes, as well as some popular dirt bike and pit bike models. ? WARNING California Residents: Proposition 65 Warning