I really cant understand why this business is so quiet? Every domain is for sale.
I have a few sellbikes net org I like to think mid $xxxx but more like high $xxx
as start typing in sites you think should be developed all available which thins out the heard. However if you were serious about selling bikes you could pick up all these domains and really secure a good business. If you find a reseller program for bikes could be onto something.
The new extension .bike is also available.