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base2, it sounds like your store has been working hard to stay ahead of the game, although inventory that isn't moving is expensive... until you really need it.
I presume bike evolution moves slowly in the basic low end market, so it is good to get good deals, and get some in a warehouse.
On the other hand, in the high end market, things move quickly. 9 speed is old news. 10 speed is out. 11 speed was here and gone. 12 speed?
Mechanical Discs? Hydraulic Discs?
It is nice to have a little depth, but if you have a road bike that has been in storage for 20 years, then it is time to start marketing it as a "Classic and Vintage" bike.