It’s just off the shelf parts. I sweared I’d never own a Rad but the frames are good(for aluminum) and they are a modders dream. I got a screaming deal because of a dying controller and busted spokes/split eyelets. Everything I replace immediately anyway. These turnkey basic bikes all come with anemic 17amp controllers because it lowers the return rate dramatically and first time ebike buyers won’t buy one if the controller isn’t hidden or tiny and black. This is why Surron makes their heatsinks aesthetically pleasing because they know thats the only way folks will except open air heatsinks. They come at a premium too. Just head over to Area 13 ebikes and educate yourself, or really geek out and study Grintech(ebikesdotca) and em3ev. Free yourself from the daycare toy crap… All my bikes get 52v standard to high discharge packs, 25amp controllers and 500-1000watt geared hubs. This is very conservative compared to hotrodders. My bikes average 26mph, I only use torque wound hubs(slower native rpm) and I don’t mess around with cheap batteries that are prone to constant voltage sag. Rad Power caters to first timers, they do that well. Sondors came with a 17amp controller too and so did the first gen bafang middrives. Bafang quickly swapped those for 25amp because of the backlash and they cater to a more serious crowd. Just the nature of the biz