Description Here is our 8-1/2″x2″ (225×48) kick scooter inner tube with an angled valve stem: a formerly odd size that is now being used on Trikke scooters as well as a number of recent Chinese-made, medium-sized, recreational gas and electric scooters. Rumor has it that this scooter inner tube is also being used on some high-end baby strollers. Talk about scooter babes! Please check the Compatibility tab for a few examples of the Trikke scooters that are rolling on this size. Whether you call the size 8-1/2″x2″, 225×48, or 8.5×2; this is the kick scooter inner tube that you need. And at Monster Scooters Parts low price, you can afford a few spares.