Understandable, I didn't mean for this to turn into a compatability thread. I have never seen or heard of sealed BB transmissions, but if it is what it sounds like, I agree 100%. I would really like to see a IGH CVT rear hub. No shifters required just pure automatic, 100% smooth bliss.

I am actually going into my senior year of college and getting my degree in mechanical engineering and seeing as next year I have to do a senior design project, I've been leaning towards the idea of building an axel driven, 2wheel drive mtb. Now I might start thinking about some type of internal CVT. I really like axel drive though.