Hello everybody.

I went to remove the bottom bracket on my Diamondback Sorrento today, as it had been clicking and needed to be serviced. I had thought from the lockring that it was an adjustable BB but the cranks are too big to see behind so it wasn't until I removed it that I saw it also has splines.



I went ahead and removed the lockring because I could and I don't have a tool to remove the bits with splines. Lockring is on non-drive side. On removing the lockring, the bearings for that side came with it:







The drive side doesn't have anything other than the splined ring. I used a light to make it easier to see.



The non drive side after I removed the lockring/bearing:





So what is this? Is it a sealed bottom bracket or an adjustable cup/cone style one? I thought that with cartridge style sealed bearings, both the left and right bearings were contained and inaccessible by the user. In this case, the left side bearings came out with the lockring. This is my first time going at the BB on a bike, so I might just be making a beginners mistake.

As I said, I don't have a tool for removing splined BBs, so one way or another I'll probably need that. Also, most of the stock components on this bike were Shimano, so chances are so is the BB. But should I buy a new cartridge style BB, and is so what kind, or is it an adjustable BB that I can clean, repack and reinstall?

Thanks for your help.
-V73