Description Does your mountain kick scooter need new rubber Our 12″x2.125″ (57-203) kick scooter tire with TL603 knobby tread offers traction in the dirt as well as on the pavement. Because pneumatic tires usually require an inner tube, we offer this tire with the option of matching inner tubes. You can select the tire alone, or your tire combined with a straight valve tube, or the tire with an extra-thick heavy-duty thorn-resistant tube. Not so long ago the concept of a “mountain kick scooter” was almost unheard of. Now young riders have a choice of several excellent off-road kick scooters such as the Dirt Doggy and the Expo Freestyle. Unlike their sidewalk cousins with their solid urethane wheels, a mountain kick scooter needs tires with dirt-gripping tread. Our pneumatic 12″x2.125″ (57-203) knobby tread tire fills that niche perfectly. Note: The 12″x2.125″ tire & tube is a compatible replacement for any tire marked as 12-1/2″x2-1/4″ (62-203). Specifications Tire type: Pneumatic Tire size: 12″x2.125″ (57-203) Tread code: TL603 Tread type: Knobby