superslow: as for the pinion spur and tire size for stock i think that maybe EA or someone could accually point you in a better direction than i could, sorry.
as for the double pinks and 30 wt: yea it can work if your track is right, the 30wt is good everywhere x-ray 30 is accually thicker than most others 30wt. the dp front tires are somewhat scary though, for the most part i still highly recomend standard dp-orange front tires just because if the traction comes up atall with straight dp's they have the tendency to frey and also become very twitchy and just plain hard to drive and inconcistent.