[racingdwarf]

hi

6.5 or 7.5 is in my opinion about 10x2 ish these days, but in 2wd 7.5 is normally as quick as you want before things start to get a bit of a handful.

I have never used a sensor less motor but the ones I have seen don't seam to run anywhere near as smoothly as the sensored motor

Yes the lower the number the faster or more punchy the motor is, in off road we tend not to stray any lower than 5.5 in 4wd but the touring car guys love speed and can to stray lower I have read, as I've never got involved with them. I'm not sure why they are cheeper maybe just amount sold less popular just don't know but don't be drawn to a 4.5 in your 2wd

Lipo's 2cell hard case is what you want, now days shorty type lipos seem to be more and more popular in 2wd and 4wd set up's. altho saddles are also good for both types. I'm not a authority on C but yes C is discharge rate the higher the C the higher the, discharge rate, in 2wd you can use quite a low C rate but in 4wd with a 5.5 bolted in on astro you want to be looking a the higher C ratings.

1 cell is for use in 12th mostly and you need a 1 cell esc or use a booster.