Whoah, I found a sick Cinema 4D Xpresso rig for tank treads! It’s a bit tricky to figure out how to animate this. You control the entire rigs animation by twirling down “Outer Wheels,” then going to “Front Wheel (hypernurb) and opening that up. The nested “FrontWheel” object is the item you need to animate. Animate the rotation on the P (Pitch) and all the gears and tracks will respond. It’s a really nice rig, so grab it and make some awesome stuff!