Well, the shaft drive is really a very simple in design. It's a way to transfer power from the pedals to the rear wheel. And the shaft drive system uses a combination of gears and bearings to basically transfer your pedaling power to spin a shaft rod that then drives the rear wheel. So all your gear changes are just like you're familiar with from a chain bike, but all the gear changes are inside and back. They're protected from all the elements, from the ring and the salt and the sand. It all goes away. And so the shaft drive is just very clean and very simple, transfer your power to the rear wheel and then you still get all your gear.