[fabianhjr]

That is mentioned in the article:

> All of that is working, too, with independent tests showing properly race-prepped drivetrains to be as much as 98% efficient.

> That elusive 2%

> As good as chain optimization has become, there comes a point where there’s no more optimizing left to do, and there are no other options but to rethink the system.

Though, not as in any modern drivetrain but high-end competition drivetrains. At least I imagine it would be with really expensive solutions like Ceramic Speed bearings everywhere.