Lol, thats like this guy trying to sell me a "speed sprocket" he said would give me more bottom end AND top end. Hmm wouldnt it be cool if you could d a 2 gear sprocket change by a push of a button like a 10spd bike. Think of it when you want bottom end you push a button and you have a 530 15/45 or 47 setup or its time to run and it goes to a 520 16/43 or 39 setup..Ok enough of the weird ideas.