I'd read the tech material that came with the cranks and bottom bracket; I believe you're supposed to be able to remove race face x series stuff without any other tools. You could also do a search for their website. Don't know,cause have I never worked on your type of crank. If you need a specialized tool, I'd get that-- it would avoid any potential damage. The proper tool saves you a lot of headaches, so I'd first find out what it is. From what little I know of Race Face cranks, you may have that tool in your box.