Here we go, dumb question # 27: What is a 520 conversion and what does it do for you? Do I need it for my F2.
it is changing your chain size from a 530 to a 520. the chain is lighter, the spokets are lighter.. less roatating mass, and faster acceleration. is it very noticable? i dunno. you don't need it, but if you are changing the chain and sprokets why not go to a 520, kent.
Not to mention if you plan on buying any sprockets or chains at the track most vendors only carry 520.