Ambrosio Hub Advice Needed!

been riding my wheels for 2.5 years now and never serviced/changed the bearings.

so, i have the Ambrosio variation of the generic hub that all seem the same to me, do they use cartridge bearings or are they loose ones, and which bearings/cartridges do i need to service them?

appologies in advance for what must be a search fail on my part.

Thanks

Cartridge 6000 2RS bearings , there are Formula and Sytem Ex threads you can check too.

Some help needed here please.

Am attempting to change the cassette on my campag fit Ambrosio winter wheels, but lockring is seized - although I seem to be able to tighten it further, but not undo...

Any suggestions? Have exerted a fair amount of force (enough to slightly bend the handle of my lockring tool anyway)...as a last resort, is it possible to remove the free hub without taking the lockring off?

Wondering whether it's worth it as the bearings seem to be completely shagged ( like riding with brake rub) after one winter. New fee hub and bearings would be in the region of 40 quid.

Sometimes takes a fair bit of force. I don't mean to be funny, but you are undoing it anticlockwise yes?

Sounds like you just need more leverage - stand over the wheel with the chainwhip in your left hand and the lockring tool in the other and give it a good firm grunt. Ambrosio hubs are rebranded Novatec and use standard cartridge bearings - if you can get a grip of the spanner flats in the spindle with the lockring in place then you can remove the spindle and freehub.