I have 2 older suntour 3 speed hubs that are fitted with the somewhat rare threaded drivers, (instead of the circlip single driver). This combination gives me 9 or 12 speeds depending on if I use an old cyclo 3 speed cog or a standard 5 speed, with the smallest gear removed. Reason I can't run more than a 4 gear cog is that the 3 speed axle is only so long. These are on old schwinn cruisers, so the derailer hanger needs to be filed down to give the axle bolt enough bite. They work well to bost the top end.