If u realy want good traction, dismount the tire, drill your hole from the outside where u want the screw . Then get 1 1/4 self taping srcews and run them in from the inside out , then run a nut on tight . i will then use a mig welder to tack the nut to the thread so they cant come off. The screws i use are 1/4 in diamiter
The set i did has only 50 to 60 srcrews per tire ,but they hook up like your on the street!
The harders part is finding the right screw and nut . The self taper screw is a lot harder so it holds up longer .
The set i made does not leak at all .no tube !