http://www.focusowners.com/forum/viewtopic.php?t=21828
All you need right here, bit of a pain, your at a HUGE advantage having an ST170 as your strandard knuckles do not need changing. I find my ST170 brakes quite ok, people upgrade to ST brakes and are usually very happy. I have 20 groove disks all round and green stuff pads though which make a difference. I do find the 300mm ST brakes are prone to warpage though.