Hi, how tall is you're son? The Sting is for riders between 4' and 5'. Our daughter is 4'5" and all I've done is cut the bars just over shoulder width, rolled the bars back a bit, dropped the stem down a spacer width and adjusted the brakes closer to the bars for her little hands. She seems to manage fine now. Hope he likes it, it's just time on the bike and practice all the time.