4mm cup an while moving the caliper around the bb it was reading 4.5mm at some points, no noticeable wear or anything grinding the bb cup. I had to replace the spindle because I broke it in half ( I have pics ) an when I replaced about 4 months ago it's been fine until about 3 weeks ago when it started a nasty crackin sound. Took it apart last night an all I can find is the ovalness an upon puttin it back together it looked like it needed a 5mm spacer ring, so I found one that fit purfecly flush an looked right. Only rode about a mile so far an it was silent. Main question, the oval bb?