With a Phantom motor, it would most likely leave you on the ground on your back with what Jerry just said...That thing with the equivalency of a 48 tooth will flip some vicious wheelies on a 20" wheel using next to no throttle, you might always be fighting it just to keep your front wheel on the ground, let alone being able to steer it properly because of that.
This is what it did to this guy on 26" wheels with the stock 44 tooth sprocket...the 48 equivalency that Sidewinder Jerry mentioned is even more low end torque.
Start watching this video at around 56 seconds in to see the bike flip him right off like a rodeo bull...lol.