You can buy from a few places. Polaris makes one that size, it's not high quality by any means, but it's around 27 bucks. Sprocket Specialists sell them, but the last two I bought from them lasted only two weeks. If you really want to pony up the money for quality, try Sidewinder Sprockets. I bought a Hi tool steel front for 40 and the rear is 70 or 80, can't remember for sure. They will last far longer than the cheaper ones. The choice is yours.
sidewinder sprockets/chains are far superior to any of the competion, they are pricey, but as with anything, you get what you pay for. check out there ti-moly series rear sprockets and there tool steel fronts.
I'm not trying to steer business away from Sprocket Specialist. I bought the front one, and it wore out real quick, like I said before. I still went ahead and bought the rear one, figuring that maybe I had gotten one out of a bad batch. That one lasted only two weeks as well. I realize an aluminum sprocket is not the best, but surely it should last longer than that. I'm not going to try them again, and I was just letting everyone know that I had problems, and to be aware. From now on, until I have a problem with them, I'll buy from Sidewinder.
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