A friend of mine has a 2011 Flatline. We were taking the frame apart last night to check/re-grease all the bearings. The one bearing that is very much different than the others, is the main pivot (just above bottom bracket shell). As I understand it, this is a "double row angular contact" bearing. I've never seen one of these before, so looking for help.
Both bearings appear to be seized - no inner race rotation in either. There are slight wear marks on the through bolt, so I'm guessing a) they are seized, and b) that it happened recently (likely over the winter since it wasn't being used). All other bearings in the frame spun freely.
Couple of questions.
1. Is this probable that both are seized?
2. Are these bearings serviceable? If yes, how do you access the bearings in order to clean and apply new grease? If no, is there a suitable replacement bearing that IS serviceable?
Pictures for reference
Bottom bracket & main pivot area
Main pivot closeup
It appears to be similar to this bearing. There is a retainer ring that holds the ball bearings in place. Not sure how this could be removed & reinstalled and still keep the ball bearings in place. Also don't know how the clip can be removed. And, if the front retainer clip is removed, would it provide access to both rows of bearings.
Any ideas appreciated.
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Thread: Flatline Main Pivot Bearing