My bike came with an FSA Omega chainring/crank and Omega BB. The rest of the components are Shimano 105. I would like to replace the BB and chainring with 105 components. What measurements/specs do I need to have to insure the proper fit to the bikes existing dimensions? I realize that the 105 group will not have the same 46/30 chainring sizes as the FSA so that is a given. Just wanted to see if what I want to do is even feasible and cost effective.
Thanks in advance, Frank.