I'm looking to buy an FSA crankset, the SLK MegaExo. I'm new to cranksets with integrated bottom brackets, and I was wondering about the measurements on them. FSA lists the SLK as BC-1.37" x 68mm. The measurement on my bottom bracket now is 68mm x 113mm. Does anybody know what that BC number means, and if so, will the crank be compatible with my bike?