8.5" diameter (approx 216mm) and 2" width (approx 50mm) inner tube, specific for bikes, electric scooters and mini BMX. Bended valve for maximum inflation operations clearance on small rims.
The Eureka SKU is a universal product code (UPC) that univocally defines a specific product in the bicycles' market.
Sharing the Eureka SKU of a listing bicycle, for example, means to indicate a very well-defined combination of Brand, Model, Mounting, and Model Year parameters that define a single bike model and no one else. The Eureka SKU of an Ad product, instead, is built from other information that guarantees it is still unique compared to all present, past, and future products managed by EurekaBike.