when you turn to the right, you push the right grip and as the bike leans to the right the contact patch on the tire moves to the right of the centerline of the tire. As this happens the radius from the wheel spindle to the ground gets smaller (because the tire is radius'd and not flat like a car).the tire diameter has in effect become smaller and offers less resistance. hopefully this makes sense to you. as it's not easy to explain it. car tires being flat across the tread can't lean and make the contact patch move left or right of the centerline like a bike can Des.
