Here we have a Shimano nine speed cassette with... a nine tooth cog. I bet most of you have not seen one of these before. The only time they show up is on some Bike Fridays and a few other odd recumbent bikes that could not use an adult size wheel.
It has SHIMANO right on the tiny, tiny lock ring.
I know you are asking, "Where can I get one? My 53-11 is just not enough for my massive quads"
Well, they only come from a couple of places. Bike Friday has them and I hear a couple of recumbent specific websites do as well. But don't rush right out to grab one because they only fit a special free hub body, also from Shimano. The free hub(sorry I forgot to take a picture of it) has splining about half the length of a regular free hub then it necks down to allow the smaller cogs to fit. These cogs have their own splining and mate to each other rather than to the central hub.
Very cool if you have a bike with a sixteen inch wheel.
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