We have a Co-Motion speedster and the front BB is starting to pop and creak. I've replaced the bearing cartridges at least once before, maybe twice, over the 8000 miles ridden. Wondering if it's worth it to invest in a Chris King BB? Also it appears the the front BB is 68mm and the rear 73mm, can anyone confirm this? Lastly, is it a good idea to have the frame refaced before installing the rear external bearing cartridges? I don't think this is possible on the front because the elliptical BB that the bearing cartridges thread into is already machined flat.

Thanks for opinions and insights.

Doug