I changed to a new set of rear rims last year and was going to put screws in them ( I run my slicks tubeless and always had used screws)The guy at M/T told me Not to put the screws in, he showed me on the new rims they are now putting a safety bead to keep the tires from braking off the outside bead. Look at the new rims there is indeed a hump on the inside. He said the old spun style rims like super tricks definitly needed screws but not the new designs.