My first post here! Just wondered what folks would recommend -new or used bike for my 15 year old (16 in three weeks) and what brands to look at? I don't really want to spend $400 unless I really have to. His last bike was used and we got it for $100. He is 5'3 and a regular build. He'll be using it for mainly riding to his pals homes , plus local trails/ dykes.Thanks for your help