I used a box of 100 screws and drive them into the solid rubber tire, the screws seemed to work really well at holding grip. I may consider moving to a all rubber tractor tire , but this is working fine. The screw heads stick out .5 inches. I will clean them off and coat the tire and screws with a thick coat of liquid rubber from plastidip so I can keep them from scratching the driveway and also have matching black wheels / tires. This guy also needs a paint job !!