Slash 4x4 with HW XR8SCT with KW 4300kv motor. think it has a 54s and 16t pinion right now. Its not too fast, but almost too fast for my front yard track. I can't get up to speed on it and can spin out if I pin it to fast. I could probably run a 12t and still be fast. Using Zee 5200 3s softs.