Originally Posted by
supton
Ah, ok, once I get that outer lockring off, then I should see splines behind that. Got it. I couldn't figure out why I couldn't see the splines on the ISIS bottom brackets that I could find, have to get the lockring off first, then I can get to it.
That's not a lockring. It's the bottom bracket cup itself, but with an 8-notch pattern that Truvativ and a few others used for the short time that ISIS was around. See my other post for the tool you'll want to remove those cups. Don't bother with anything else as you'll just make your life harder. Trust me.
A few people have mentioned splined bottom bracket cups which some vendors, like FSA, did use with their ISIS BBs.