Okay, time to bump this topic as i've now started doing research for my project. Has anyone got any more suggestions for me? Definitely being made out of aluminium now, Geo will be a shorter Coust v2 ( 1085, +35, 380, 72 ) I thinks....with a rear disc mount and magura specific mounts. Tempted by this whole press fit isis bb jobbie, any ideas? anything to stop me pulling apart an old sealed bearing isi bb, and getting the right size bearings and simply pressing into frame? Still trying to debate over horizontal and vertical drop-outs.....i'll definitely stick with 135 spacing though I reckon. Any views or Suggestions would be more than welcome Thanks