I've been looking around at used C'Dale R5000 or Six13, and some come with the proprietary Si BB and crankset. Not being very familiar with this setup, and having Googled and searched the forum to no avail... I have a few questions:
1. How reliable is that BB? Is it a typical forget-it, or a nightmare that requires impossible-to-find tools, non-eixstent replacement parts, for a better-do-it-often maintenance?
2. What chainring replacement options exist on this thing? Is it standard 130mm BCD? Can I plop in any replacement rings (Shimano, Sugino, T.A., etc.)? Of course the official Cannondale answer will be "No, only Cannondale rings can be used", but what about real life?