I bought an X-PRO 40cc for my 5.5 year old grandson. those bikes for him and he was like a champ. It uses footpeg bolts, but the ones on the bike are too short. It comes with longer ones which are too thick so we had to drill out the existing holes a bit, but it's thin metal so any metal drill bit will do. Not hard. Then he immediately switches on and works like a champ. Super stable. Because our farm is very sandy and bikes don't work well in the sand, this kid has never ridden a bike. It was his first riding experience. It has no concept of power balance when you're cornering tight, these wheels have made all of that completely irrelevant. It snaps around and is rock solid.