This wide knobby tire enables travel over snow, sand and gravel. The Kit includes two 16?3" push button wheels that are wider and more rugged, offering superior handling on unpaved surfaces. Now, nothing can stop your Burley from coming along for the ride. A wide range of acceptable tire pressures let you adjust the stiffness to your liking. Let a little air out and the tires soak up the bumps for your passengers. Constructed with aluminium rim/hub and stainless-steel spokes.