I wouldn't recommend the side winder micro or mamba 25 for a crawler. I know many people have used them (I did in a 2.2 tuber), and it will work, but those were really designed for 1/18th scale RC's, not rock crawlers. Also, if you use high voltage 3S lipos or 8 - 10 cell NiMh, that could burn them up or thermal - shut down them quickly. Even if you do use an external BEC like the CC BEC, those micro ESC's really do not hold up well long term. They also run brushless motors better than brushed, even though they can do both. If you search the forum, many people updated the firmware for the mamba 25 to run brushed motors and they burned up the ESC. It just doesn't work well. You are drawing more amps from the start with crawlers to climb, where as in a micro, you are not really drawing the amps until top speed which you are in and out of. The drag brake is also stronger in the Side Winder and Mamba Max 1/10th ESC's.