Are Zippy Lipos safe with a Castle MMM Speedy?

[RC-Monster Mike]

Gearing up won't reduce the "pep" like it does in brushed setups, which are very finite in their ability to produce power. The limiting factor in creating "pep" with a brushless system is ultimately the batteries. If the batteries can deliver, gearing up will make it feel even more powerful. If they can't, then perhaps re-reading this entire thread is a good idea. This "gear up to reduce torque" philosophy is old school brushed thinking and does not apply here(and can be problematic).