OK, those are definitely not BB30 cranks then. That's a standard 24mm threaded cup bottom bracket. BB30 cranks have a 30mm spindle and that only 24mm.
If you have the right tool, you can replace the bearings in the cups but the cups are now so cheap, you just put new ones in.
You can get many, many different brands, including Shimano, FSA, Chris King....you name it.
You a asked about bearings. I've explained the headset scenario but for the BB, just buy new cups. They're called "external BB adapters" for some or other reason. They come in two versions, Italian and English. Judging by that flag on your bike, I'd say it does not parlez vouz Italian. Get the English (BSA) threaded adapters. You will need a special tool to take them out yourself and some knowledge about the one right hand and one left hand thread.