I'm interested in this, I might spring for the newer battery just so I can have synchronized shifting. Can you give a better explanation of how it works? From my research it looks like when you are in the small ring and you get to say the 8th cog (smaller cog, I call the largest cog gear 1), it will shift to the big ring in front and shift the rear up 2 or 3 gears, say from 8 to 5. Is this anywhere near accurate?