Product description guide: what this is for: your emergency backup plan this inner tube is designed for cunfon rz800 and rz1000 electric scooters. These models use tubeless, puncture-resistant tires as standard. Consider this inner tube a temporary, emergency solution for when your original tubeless tire is severely damaged e.G., A large cut or sidewall tear and loses air. It allows you to resume riding quickly without an immediate full tire replacement. Critical installation warning read before buying your rz800 rz1000's wheel comes from the factory with a pre-installed, removable tubeless valve stem. You must remove unscrew this original valve stem from the wheel hub before installing this inner tube. This inner tube comes with its own permanently fixed valve stem. You cannot have both stems installed. If you attempt to install the tube without removing the original stem, it will not seat properly, will puncture immediately, and will not hold air.We strongly recommend professional installation if you are unsure. Our recommendation for optimal performance & safety for the best long-term reliability and safety of your scooter: best option: replace the damaged tire with a new, original-spec tubeless tire. Upgrade option: switch to a high-quality self-sealing tubeless tire for superior puncture protection. Temporary fix: this inner tube is a verified-compatibility backup for short-term use. Need help we're here for you. If you have questions about compatibility or need inst...