I have a single-speed Kona Unit bike. The rear hub is a disc hub with a splined freewheel from JoyTech. I see a multitude of threaded and splined cogs on the market. Which are compatible (and which aren't) with the JoyTech? The most common cogs I see are three-tab Shimano Nexus/Alfine ones. Although my JoyTech hub has more lands and grooves, will the Shimanos work?

I've learned to look at Mr. Sheldon Brown's site before posting stupid questions here, but I find no mention of the JoyTech rear hub.

Thanks - FH