There is now an inventory type for when you're selling a virtual product.  Not a physical bike, but a place on a tour / activity or event.

In this example, I've used BRM to run Shuttle rides so the inventory type I'm selling is TAE - meaning a place on the bus.

Here is what the TAE icon looks like in more detail:

In future we will create more custom behaviour for these virtual inventory types to make it easier to run your operation.

See also

controlling when your Tours / Activities / Events are available for sale