MOTOZ HD Tire Tube for Racing N/ADesigned to fit motorcycle tires at maximum volume, so theyre under the least amount of stress (not stretched when inflated). 100% high grade Natural Rubber can be repair and patch easily. Stretches like a surgical glove and can be compressed under load without splitting. Less unsprung weight. They arent cheap, but they arent expensive for what you get. 3 Types Thickness Available: 1. 4 mm Standard Series 3 mm Heavy Duty Racing 4 mm Ultra Heavy Duty