I have an older Specialized Hardrock MTB (w/a FH-RM40 rear wheel hub) on which I may need to replace the free hub. It's a 7-speed. I've figured out the Shimano part no. for the free hub (and it may or may not be available). However, there's what appears to be a newer free hub (for a FH-M290 real wheel hub) that may work, but I haven't been able to confirm or deny it. Anyone have any experience or insight with this?
Also, if I wanted to change my system to an 8-sp., any ideas on the freehub I could use? (I know there are some technical concerns with spacing and shifters that I might need to attend to).
Appreciate any input anyone can provide.