I'm looking to put a 9speed cassette on....
I'm looking to put a 9speed cassette on. Will these work for that or do they need to be with 10 speeds?
You could run these as 9 speed however you will have to run them in friction mode as they are designed to be used as 10-speed SIS. The spacing is different on 10-speed than 9-speed. So if you like hovering between gears and trying to get them to line up you could use these.