I've managed to mangle some teeth on my SRAM PG 1210 SX cassette and will need to replace it. At the moment I'm struggling to find anywhere that has one i stock and I was wondering if there is anything else that will be a direct replacement. I've found Sunrace and Clarks cassettes along with a lot of strangely named things on Amazon so I wondered if anyone had experience of changing brands ? I'd even consider loosing a cog or two and going for a ten or eleven speed set up if it were plausible. Any thoughts ?