New to cycling last year, and want to learn more about maintenance, etc, etc. I have 3 bikes (a very old hybrid falcon california), BTwin 500Se, and Now a new 2021 Cube Attain SL. The 2 road bikes use standard shimano lock ring, and need to replace the BTwin (chain and cassette ordered), fine. The chain "seems" OK on the falcon, but the lock ring is different. Sorry for the photo quality (I have since cleaned up the drive train), but can you let me know what's required to remove the cassette? Is it something like this?
https://www.parktool.com/product/fixed-gear-lockring-wrench-hcw-17?category=Cassette & Freewheel
https://www.parktool.com/product/fixed-gear-lockring-wrench-hcw-17?category=Cassette & Freewheel