On my ride back from work yesterday I picked an old twisted wheel lying on the roadside. It has a 3 speed Sach Torpedo hub with coaster brake.
I cut the spokes and discarded the rim and if the hub is in working order I plan to re-use it and convert an old utility bike to three speed.
When I've managed to disassemble and clean the internals, what type of lubricant and how much of it should I use to repack the hub?
Also, it has a 21-tooth sprocket. Can I rig it on a small wheel or should I stick to a 650 or 700 rim?
I'm not very knowledgeable of gearing ratios and such so any help would be welcome.