Stronglight A9 is the needle bearing unit?
Originally caged ball, then needle/roller and now cartridge.
Personally I'd avoid roller bearings, as a HS is the wrong application for them.
Now cartridge? Hmmm, may have to consider one of those, as finding a 6400 is proving difficult. Is it easy to spot the difference in bearing type when buying the A9?
bt
Yes, definitely cartridge (I've added links to my post above).
I don't know if there is a visible difference between the different versions, you'd have to ask the seller.
@BelgianToothpaste started
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Originally caged ball, then needle/roller and now cartridge.
Personally I'd avoid roller bearings, as a HS is the wrong application for them.