The store in that link does not appear to sell outside of Europe. The sprocket is also not available through US BMW dealers. But you can find it at other European, or Chinese (it's apparently standard in the Chinese market), sellers.
Finally got my 15 tooth sprocket from Sprocket Center. What a great mod. The bike came alive. Better performance over the entire rpm range. 6th gear is actually usable now. It'll pull the mountain pass here in 6th when the 16 tooth required downshifting to 5th. MPGs have not suffered, probably because the engine does not work as hard. RPMs at 60 mph have increased about 400 rpm in 6th gear. Best $30 I spent on this bike.
I bought the 17 tooth sprocket from BMW with the Part Number 33828396375, its basically the default sprocket for gs bikes sold in china.
The bike is far more quiet and the engine is working in lower rpm, and generally feels more smooth to ride, it just doesnt have as much nerve with two people as it did with the 16 tooth sprocket.
Would recommend 10/10 for open road and travel, even for city rides if you are alone on the bike most of the time. Im really happy i bought it and its also kinda cheap around 20 euro.
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