The thing that worries me about reel bikes is that Iron Man was turned to steel in the great magnetic field when he traveled time for the future of mankind, now the time is here for Iron Man to spread fear, vengeance from the grave; kills the people he once saved. Nobody wants him, they just turn their heads, nobody helps him, now he has his revenge.
Sure seems like a lot of potential to get caught in that great magnetic field on a steel bike and then killed by an angry superhero. That's just not a risk I'm willing to take.