How to remove this eccentric bottom bracket? One of my bikes has an eccentric bottom bracket with a Gates belt drive and a Shimano Alfine 11 IGH.

For a few days now, I've experienced some creaking noise when pushing on the right pedal. Even removing the right pedal, cleaning it, greasing it, and putting it back on didn't solve the issue.

So I figure I should do the same thing with the chainring, but I don't know how to do it: After using a 10mm Allen key followed by an 8mm Allen key, I could successively remove the two screws on the left side (shown as "1" on the picture), but then, I'm left with empty space where a standard bottom bracket axle lives.

Should I use some specific spanner to undo the rings shown at "2"?



Thank you.
Those are self extracting crank bolts. 

Sram / TruVativ use them. They work like a charm. 

The BB cups require a special wrench. The BB should be a Sram / TruVativ GXP. 

These require a special wrench that will be referenced as having 16 notches, as there are 16 depressions in your BB. 

You can find cheap ones or expensive ones. Up to you. 

Remove the BB cups, clean everything really well, grease generously and put a new GXP. 

They are well priced, and in my experience they are reliable and efficient. Also you couldn't get any easier to adjust. Good luck!