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@Scilly.Suffolk
The NDS was a bit gritty (year old bike), so I popped the seal and wiped it out. This smoothed it out, so a dash of grease and I put the seal back on.
While I was at it, I opened the DS too and found the bearing has what looks like an additional shield.
Any idea what's what? Both bearing are OE as fitted to a Felt B12 and are both marked "FSA BB30 6806-2RS MR149" (the second rubber shield is present on the reverse of the bearing).
The NDS photo is from when I re-opened it and cleaned the fresh grease out, but the difference is clear.
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