20"x4.0" Fat Tire Inner Tubes

Size: 32mm (Regular valve). 20" x 3.5/4.0 tire tubes, suitable for RollRoad electric bikes, Emma 3.0,  Shark 3.0.
High Quality: This tire tube is made of high - quality butyl rubber. It has the advantages of good sealing performance, ozone resistance, aging resistance, shock absorption, and electrical insulation.
Comfortable & Safe: After replacing the butyl rubber tube, it can cushion the impact from uneven road surfaces, making the ride more comfortable and safe.
Easy Installation: Installation is quick and easy. When inflating a completely flat tire, please follow the inflation guide. It saves time and effort, and you can replace the old tube in just a few minutes.

Installation Precautions: Please check the side of your tire to confirm the tire size used by your electric bike.
Important Note: When changing a bicycle inner tube, be sure to inflate it a little before installation. This gives the inner tube its shape and prevents it from getting twisted or wrinkled, which may cause a pinch flat. Check whether the tire beads on both sides are evenly seated on the rim.