【Low-Grip, Shrink Tires Ideal for Front Wheels on a Single-Shaft Setup】 These are small-diameter, low-profile super hard tires. They were soaked in solvent for a week to dissolve rubber components, then washed and mounted on wheels. After a week of drying, they were processed with a tire setter to create 24mm (23.9mm) diameter "Pera Tires" (thin tires). Grip is lower than low-friction tires, and they are hard and less prone to bouncing. Tire width is within official regulations. Please give them a try!