thanks to all the replies. It is/was a problem with the chain. i am now just working on finding the correct tension. The chain slipped off the sprocket three times yesterday on some Chilean back trails in heavy rain. i couldn't adjust the tension with my tools (the bolt was too tight!) and had a terrible (but laughable today) day in the muddy, rainy hills. not sure about any of the 3000rpm ideas, but i hope that the chain problem will be solved this afternoon!
thanks!
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