GMAC is basically a MAC motor that's modified by Grin.
Have you ever heard of MAC motor? It is basically a really high performance hub motor.
For example, do you know an ebike company called Juiced?
For their lineup, they use Bafang.
CrossCurrent X, Scrambler, RipCurrent, OceanCurren... they're all powered by Bafang.
Their high performance lineups are powered by MAC motor, such as HyperScramber, HyperFat 1100, etc.
GMAC is basically a beefed up MAC motor, modified by Grin Technologies.
They're located in British Columbia, Canada.
There are 8T and 10T.
8T is faster
<p>GMAC Clutchless Geared Hub Motor, 8T (10.2 rpm/V) Winding. <span>This motor includes an internal 6-pole speedeometer sensor so it can use a CA-DP device and not require an external speedo pickup.</span> Includes 3 piece CNC'd torque arm with inner
www.ebikes.ca
The PhaseRunner is a powerful and compact controller made by Grin Technologies.
It has over 90A of peak power.
Rize does not give spec for their controller, but I'm guessing 20A (give or take)
I think your controller is hidden inside the frame, most likely in between the battery and head tube.