So I'm looking at picking up the ATF frame soon and just looking at what's going to transfer over from my old bike to this one. Not being mechanically minded at all I usually learn about things as and when I need to either replace or fix them. One thing I'm pretty in the dark about is BB's and the compatibility with cranks. I was just wondering if there's a particular sized spindle the BB will take or is it just a case of making what you've got fit with spacers/bearings etc. Sorry of this is a super simple question, like I said, I just ride and worry about how it works when it goes wrong haha.