7076 aluminum, sometimes called Ergal, is essentially as tough as steel, but weighs very little in comparison. by converting my entire rear drive to aluminum, I saved pounds of weight.
there are plenty of stories out there about people who have run aluminum sprockets and ran into very premature wear. BUT, there are always two consistent factors:
- misaligned chain
- the sprocket was CHEAP and not made of 7076 aluminum.
The Panigale is a very lightweight bike. Unless you weigh like 300lbs+, 520 should be just fine.