My little man has mastered his balance bike and will in short order outgrow it. He's very tall for his age. For his third birthday, the thought is to get him a bike with pedals. I saw a Specialized "Hot Rock" (IIRC) that some local parents said was great for their son. It would be nice if I could stuff it in the back of the trailer (Burley DLite) like I do with his balance bike. I would appreciate any suggestions or endorsements, thanks!