It's not the cost,Bob.I am just not going to turn him loose on this little bike.I had a roller installed which will not let the bike exceed 20mph.I'll be right in front of him all the time on my moped.He'll have all the elbow,knee,and wrist supports on like he's skateboarding,and I doubt he ever tops 15mph to tell you the truth.He's a timid little guy,not prone to risk-taking like some young-uns.Thanks for your concern.I appreciate it.