Now you do not need to replace your entire MD180 Spine for 600+ just because of a broken sprocket teeth or a damaged sprocket, you can just replace the sprocket on your own. This metal sprocket is stronger than the plastic sprocket and will last the lifetime of your Hobie Mirage drive MD180 Drive. It fits ALL versions of the Hobie MD180 drive. Upgrade both your MD180 front and back sprocket for 199. About hobie mirage drive 180: Weighing in at under eight pounds, the MirageDrive 180 produces full power in both directions and offers unprecedented manoeuvrability for your pedal kayak. The user can pull one of two shift cables to pivot the fins 180 degrees, almost instantly from forward to reverse and back again. Logs? No problem. With our patented Kick-Up Fin technology, the fins automatically "kick-up" when an obstacle is hit. The dual fins provide shallow water access and easy shore landings by simply pushing one pedal forward. Hobie ARC cranks adjust with the push of a button to accommodate users from child size to tall adults. The MirageDrive 180 continues to deliver on Hobie’s legacy for reliable performance, confidence-inspiring power and all-day efficiency. With Kick-Up Fins, explore without a care. Kelp and logs? No problem. These fins automatically kick-up on impact and adjust back when you resume pedaling. Imagine the possibilities for your fishing kayak: backing fish out of cover; safely fishing closer to obstructions; or fishing downstream while holding in current. Hands-free propulsion in any direction means better control: to cast, to present baits, and to concentrate on landing bigger fish when kayak fishing. Pictures can be snapped or cold beverage enjoyed on the way back in without ever stopping.