Your bike most likely uses a freewheel, not a cassette. The Performance SS kit is for cassettes, so it probably won't work.

To single-speed your bike, you will need a tool to remove the freewheel (depends upon who made the freewheel) and one single-speed BMX freewheel.

Check Park Tool's website: http://www.parktool.com/repair/readhowto.asp?id=48


(common freewheel tool)



(single-speed BMX freewheel)