In honor of good engineering... and sprockets
some things are good ideas but need time to develop....
a 520 steel sprocket is a ok idea (not a great one), but it took some time to develop and angry customers (unnecessary from my point of view) and broken s... to make them safe.
the new variable compression engine from Nissan took almost 150 engine prototypes and huge amount of testing before rushing it to final production, (BMW would have released it after 15 and sold 2 years of lemons bmw, then they would have made it the final one).
if you want to go light, go Al, my personal choice is Al sprockets with the 525 chain, since I ride a lot