Size: 20x4.0 inch Fat Bike Tire.The ultra-wide size of 4.0 can provide very good stability and comfort for your riding. High Security: In order to improve the puncture resistance of the tire, this fat bicycle tire adopts a 60tpi manufacturing process and a unique rubber synthetic formula. Compared with other 27tpi or 30tpi, the puncture resistance of this 4.0inch bike tire has been significantly improved Excellent Grip: Unique fat tire tread pattern design and high-quality synthetic rubber materials make this bike tire have very good grip performance and can adapt to various complex roads Foldable and Easy to Carry: Although this fat bike tire looks very fat, it is very light and easy to carry. For example, it can be used as a spare bike tire. You can easily put it in your bag when you ride outside Worry-free after-sales: We have a professional after-sales team. If you have any questions, you can leave us a message and we will reply to you as soon as possible.