540 style. 36mm diameter. pretty much any 1/10th scale system will fit. Typically, you'll want to keep it between 3-5,000 kv. 3,500-4,500ish kv seems to be the sweet spot for 1/10th trucks. Check out Castle Creations Sidewinder 3 (SW3) and Short Course Truck (SCT) set ups. The 3800 and 4600 kv set ups are really popular. Right now, my Fury has a SW3 ESC and Turnigy 3900 kv motor. Fun bashing set up.