well ffrom what i learned in the past couple of days everyone else tells me that the pink is for large tires like 29.5 or 30's so if you were to put it on you would think that you would get better snap at the bottom end. i know one thing it will pull wheelies like crazy with that spring and stock size tires.ok, i've got the same kind of question. I've just received my epi pink primary for my 650 sra with stock size holeshot atr's. what can i expect from this spring? i want a better holeshot and want acceleration better. did i do right? Dyna ignition is on the way.