Sprocket combo
#25
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Agreed.
#28
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If I was running an SF and only doing roads for 90% of the riding I'd do the 39/15. Top gear would be pretty much an "over drive", which it actually is on the 09 and newer with a 21/20 gear, the drive being more teeth than the driven. Run top gear on the flats when it can be run, go to fifth otherwise. What is given up is the lower gearing doing dual sporting needs and the quick acceleration some riders like. Once into the middle it's pretty much normal, you're just in a different gear than you might ordinarily be. Rev all the gears out to higher speeds and use top gear whenever possible, after all there is no mechanical reason to have to run sixth.
I snagged my JT sprocket either on ebay or Amazon, both the front 15 and rear 39.
#29
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I prefer JT sprockets. I usually buy them on eBay. It's always a good idea to replace the chain with new front and rear sprockets at the same time. They wear together and just replacing one will cause accelerated wear on the new chain or sprocket if you don't replace them at the same time.