I would like to upgrade my crankset (front and rear). Right now I've got a 52/42/30 triple up front and and a 12, 13, 15, 17, 19, 21, 23, 15 (12x25) eight gear setup in the back. Also: shimano sora triple shiftlevers and sora front and rear derailers. My question may be loaded, but I really just want to know my range of compatible cranksets that I can use without changing out the shiftlevers and derailers. I see a lot of triples being listed as "10 speed" will these work with my 8 gear setup? Too confused.