You'll want the aperture at 1.8.... Then use the fastest shutter speed and lowest ISO you can get away with. Because of all the movement on the ride, you won't want a shutter speed any lower than 1/80, and I'd try to keep it faster -- 1/125 or faster.
You probably don't want ISO higher than 6400, but I'd be ok going as high as 12800 if totally necessary.
I'd suggest trying a shot in A-priority mode, with ISO manually set to 6400. See what shutter speed that forces the camera to choose. If it's choosing 1/125 or faster, you're set pretty well. If it's choosing a much faster shutter speed -- like 1/500 or faster, then you can actually reduce the ISO to 3200 and get better image quality.
If the shutter speed is coming in too low -- below 1/80, then you will need to boost the ISO a little higher.
I'm not sure how auto-ISO works on the D7000. If you can set the parameters of the auto-ISO, you may want to leave it in auto ISO mode, with a minimum shutter speed set of 1/80 or 1/125. Then just shoot at Aperutre-1.8... But make sure the results are coming in ok or you'll need to make some quick adjustments.