How many ball bearings?
 

I just ordered 4 mini-x chassis. I'd like to know how many and what size ball bearings i need for one car. I know i need 4x 12mmx8mm for the diffs. How many 6x3's? or 6x2's? Also what kind of speed can i expect with a six cell compaired with a ABC Dtm/X4 which i also have?

you need 6 6x3's

Thanks for the info Takumi.
One question though: i read that the front shaft holder needs a 5x2 bearing. Is this correct?

you are correct. i forgot about that one. i thought that it came with the kit maybe i just got lucky. chances are i ordered it and forgot i did. anyways that one is VERY important