This inner tube will fit any of the following sizes: 20x8.00-10 21x7.00-10
This size tube is very commonly used in the 250-400cc Trail Off-Road Chinese ATV Quad
Remember to always add a little air (to give the tube form) to the new inner tube before installing it. This will prevent it from bunching up and/or causing a pinch flat or possibly blowing the Tire off the Hub Rim (when you immediately and fully inflate) which ultimately will pop the tube.Before changing the tube, please check whether have some stones or sharp things that may break the tube that stay in your Tire.