Give young riders the confidence they need to master two wheels with these Specialized training wheels. Featuring a clever three-position, tool-less installation and removal system, they make it easy to adapt as your child progresses. The robust design and flat-proof tires ensure a smooth, stable learning experience.## Features* Tool-less, 3-position installation/removal system* Closed-cell foam tires won't go flat* Durable tubular steel arms## Specs* Size: 16 inches* Compatible with 2011 and newer Specialized Hotrock or Riprock 16-inch Coaster models.