I know nothing about repairing bikes. In fact, one of the reasons I ride fixed is so I have a prayer of actually fixing something when it breaks. Anyway, I have a buddy who does all my bike work and he is out of town for two months. The question: I need a new crankset for my Jamis Sputnik. You don't even want to know what happened to the old one. Can someone out there give me a reasonably light option that isn't super expensive? I think i need 175. I don't mind spending a bit of money on a good one, but I would like to get value. And, you know, some instructions on how to switch it would be cool too. Thanks in advance.