disc brakes are certainly a wake up call compared to my dodgy old v brakes, that said a decent, well set up pair on a straight rim (my old bike qualified for none of these btw) are certainly the best way of stopping in the dry but throw some mud or water at them and wahey....

it's an eccentric bb, a chain tensioner is used by some but kind of defeats the object imho.

chris, i'm hoping that woburn will give us something of what you're looking for maybe chicksands too but it's a bit small.

cheers

julian.