16" Kids Coaster brake wheel. Could be a nice upgrade with the alloy rim to save some weight. This will fit most bikes that use a tire ranging from 1.75 to 2.125. The coaster brake means the brakes are applied while pedaling backwards.Item Specifications-Wheel Size:12"-Rim Material:Alloy-Spoke Count:20 Hole-Spoke Type:14G Galvanized Spokes-Axle Size/Type:3/8 Bolt On-Axle Spacing:110mm-Valve Type:Schrader Valve-Cassette Body Type:Single Cog Driver-Inner Rim Width:25mm-Brake Type:Coaster w/18T cog-Tubeless Compatible:No