Cycling gear can be broadly categorized into different usage types based on the type of cycling being done and the preferences of the rider.
Then there are "season" criteria such as, for example:
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.