I'm sorry if this is a noob question but I keep seeing references to having to change the whole group when changing hubs and want to double check before I get in over my head.
I have three bikes, none of exceptional quality but they get me where I have to go (when they work) faster than walking, great exercise and cheaper than any transportation method. One mtb (6 sp, bad weather and backup), one Nishiki Sport road bike (6 sp, longer distances & exercise), and one Downtube folding bike (9 sp, quick jaunts).
Been having problems with the rear wheels (I'm a Clyde at 280#) of all three and will probably have one or more rear wheels built. I'm debating about going over to cassettes (2/3 have freewheels). If so I'd keep them Shimano compatible - seems cheaper with more flexibility in parts. Also would keep it at 8 speeds or less to avoid moving over to a thinner chain (which I seem to keep breaking).
I use friction shifters on all three. If I move over to cassettes on the mtb and Nishiki do I need to worry about anything with the rear deraileurs or shifters? Personally, out of the three I dislike the way the cassette shifts the most but I keep reading about how cassettes are better especially because they support the rear axle better than freewheels and shift better. I do like how much easier it is to get the cassette off than the freewheel though.