I've recently acquired a 2007 Specialized Allez. As I was dismantling the bike for service, I discovered that the bottom bracket bearings are in rough shape. They aren't smooth at all. I took apart the bottom bracket cartridge and I've pulled out the sealed bearings.
Is it typical to replace bottom bracket bearings? Or do people usually just replace the entire bottom bracket cartridge all together? Looking on sites like Performance Bike, they don't seem to carry bearings at all.
Also, if I decided to replace just the bearings, do I simply need to find a good quality set of bearings that are the same size as mine (in this case 15mm x 32mm x 9mm)?