Originally Posted by
TallRider
What stands out to me, particularly in the first and third pictures that I posted, is the consistent asymmetry (shark-finning) of the teeth. The right/forward edge of each tooth (that pushes the chain roller) is more vertical, and the left/rear edge is more slanted. That is the part where I wondered if it was normal/okay, or a result of significant wear.
I think you're right that you're seeing wear, but IMO it doesn't matter until the teeth are getting close to being hooked; in any case, aluminium being softer than steel, I find it hard to imagine how this would significantly accelerate chain wear.
Originally Posted by
TallRider
I reckon that makes your bro tres cool. Even more so if he lives to a ripe old age.
But he really needs to have a think about drivetrain efficiency.