Looks cool. Not sure what the data says, but here are some friendly, if slightly critical, thoughts:
If you're gonna completely replace the cage and pulley, why in the world would you design a system where only ONE pulley is oversized? For max benefit, you really do want TWO oversized pulleys, otherwise the chain friction reduction is going to be very, very small. (Most, if not all, of the other high dollar pulley cage upgrades include a system in which BOTH pulleys are oversized.) Then, if you're gonna go with the budget AL models, why in the world would you make the pulley wheels with cutouts? If the pulleys are AL, you're looking at a weight savings of just .0001 grams (don't quote me on that, I just made that number up) from the cutouts. For me, far more important is the way the cutouts attract dirt, grease, and grit (which, of course, adds drivetrain friction). Plus the fact that the pulleys are probably a lot more slippery (aero-wise) when they are solid. So those two things would be deal breakers for me ... But if they were to address these things and the cost is not too crazy, it might be a nice upgrade. Hope the designers are reading this ... ;^)
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