Larger is not better with a motorcycle. It's gotta be quite heavy. Both of those things would take away from the biggest advantages a car has over a motorcycle.
I'd have to see a few things to care about this...
Braking time/distance. Sure it can go 126mph but how quick can it get back to zero.
How well can it corner or do a slolum maneuver? I don't how fast it can go in a straight line if it can't go though curves or swerve to avoid danger.