Replacing the bearings on a Surly hub

The front wheel on my Surly Steamroller has started clicking and dragging. Pretty sure the bearings needed re-greasing, so I took the wheel off and cone cups only to find a cartridge with bearings. Mmm.

These are the wheels with Surly hubs and Alex rims bought with the bike complete. Is this cartridge removable and replaceable?

If so, anyone know how a I get the cartridge off and what part I get to replace it?

Thanks!

http://www.lfgss.com/thread35165.html

http://www.lfgss.com/thread31423.html

Thanks, VL

The part needed id BG7901 and they ca be got mail order from billys.co.uk for £8

Thread dredge... Logic tells me the answer is yes, but I'm gonna ask anyway. Is it best to replace both bearings at the same time?

it would seem likely that they would wear at similar rates, so yes.

I thought I wouln't open a new thread for my question...

Do you need you replace the bearings when the hub becomes loose, or they can be tighten?

I'm quite confused, because in a bike shop I've been told they need to be replaced, because surly hubs can't be adjusted, but then I see this in the surly website:

Your Surly New hubs use adjustable cartridge bearings (like many threadless headsets) so that the 'play' that develops as bearings wear may be adjusted out. This will allow longer life from the bearings assuming they are adjusted properly. They adjust like loose-ball hubs, in that they work on a cone and locknut system. If you know what that means, you may already know how to adjust them. Regardless, if you are not sure what you're doing we highly recommend taking them to a competent professional bicycle mechanic. If you think you might know how to do it but just have some questions, feel free to contact us. The long and short of it is this: make sure your Surly hub bearings are properly adjusted, and when they need adjusting have them adjusted by someone who knows what they're doing. Our New model hubs all use 7901 series adjustable sealed bearings. The black seal should always face outboard. Or if you want to take the guess work out of the equation try 6901 series non-adjustable bearings.

Please note I wasn't told "it's not worth to adjust them", it was "they can't be adjusted".

Thanks!
xabel