Ok so i have a 2010 specialized hardrock that i have been swappin out parts for the past two years and have been really happy with the bike in general. But i was wondering if i could switch to a hydraulic disk brake and disk? I have a friend that i selling me a set of Hayes for cheap and he said that i could use the 7'' disks if i wanted them. But thats where i was uncertain if i could use the larger disk on a stock setup. Is there anyway to make them fit or am i stuck using the smaller disk with the new hydraulics ?