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@benbrangwyn
@ono: that's a cup and cone, for sure. With the right tools, you do NOT need to remove the crank in order to adjust the bottom bracket. You'll need a standard BB lock ring spanner (eg Park HCW-5) and a pin spanner (eg Park SPA-1).
Sheldon explains how to do things here: http://sheldonbrown.com/tooltips/bbadj.html. Just remember to loosen the lock ring before trying to use the pin spanner on the cups.
And if you want to service the "fixed" cup on the other side, you can do it without removing it (which can be really hard and uses a special spanner) by a) taking off the drive side crank and then b) loosening the non-drive side cup completely c) pulling the axle through so it comes out the non-drive side. Put an old t-shirt down to catch the ball bearings otherwise you'll be searching for them for the next couple of decades.