100A is fine for a continuous current rating, but when hitting the throttle hard from a standstill, doing wheelies, etc. cause current spikes that can hit over 200A for a short time. That is just my understanding from talking to the guys at Castle and stuff. Unfortunately, we haven't been able to get any accurate graphs from anyone, because the eagletree (which is what most people have, if they have one at all) only goes up to around 120A. The Quark Monster Pro, for example, is rated at up to 300A spikes and that's a 1/10 scale controller.