Flying Horse Heavy Duty Bicycle Tire Liner &ndash; Gas Powered Bicycle Flat Tire Protection Mr. Tuffy Heavy Duty Tire Liner will make your tires virtually unstoppable against whatever's on the road Installation is easy: just line the inside of your tire with the liner, then put the tube on top so the liner is between the tire and tube, and install the tire and tube like normal Because this is made from rubber there's no worry of damage to the tube, tire, or loosening any of your spokes This liner is lightweight, weighing less than liquid-filled tubes or thorn-resistant tubes so you're not weighed down by extra chemicals or materials Protects against small rocks, glass, thorns, etc...