The GT Mach One 16" Bike is GT's smallest Mach One offering with 16" wheels ideal for those youg riders around 3' 6" and under.A 6061 alloy frame paired with hi-ten steel forks and bars give this mini machine all the strength and rigidity it'll need to get those younger riders learning and progressing at a consistent pace.It also features a load of well thought out parts that keep the overall bike weight down so it feels way more comfortable.