I understand that it can be done, I already said that. And I know that plenty of people do it. And 'nimbleness' hasn't changed for me from a BMX bike to a track bike. Sure, theres a bit of a difference because the wheel base is longer, but riding in Michigan, the roads are complete **** and you're lucky if you get to ride on a smooth road. And I have people who don't know how to drive who are constantly pushing me into the worst of it. And honestly the only reason that you're able to go that fast is because you're over 80 gi. So you're really not riding that bike as it was intended, are you? If you took that thing into a park, having such a big sprocket would make a bunch of stuff impossible, and having that amount of gi would make it hard to maintain a speed that is optimal for park/street stuff. Too hard to start when you don't/can't go very far or you need to be slow to start.