What's a Cush drive? Dude- you've got a picture of one right next to your post! image


Just ball-bustin' a bit....it's the part of the wheel with the studs to which you attach the sprocket. It- along with the rubber-cushions inside the wheel helps "cushion" the shock from your chain/motor.

The short answer to your 180-200 tire question is Yes.....but will depend on frame/wheel/sprockets/ect......but yes, can be done.