OK guys, forgive my ignorance! Recently got a system six cannondale road bike (used). It has dura-ace cranks. Does that mean it also has a dura-ace BB? Or could it be the cannondale SI or BB30? It has the new "exo" style and around the edge is labeled BC1.37x24? Is this dura-ace? Also, I haven't overhauled a new one like this. Any web-site with good info would be appreciated. I assume it's some type of sealed cartridge bearing. Any special tools needed? Thanks in advance for info.