The 5Dev 8-Bolt Titanium Chainring is CNC machined from titanium, which holds its tooth profile under chain load through extended use in a way that aluminum doesn't. The contact geometry stays consistent long after an aluminum ring at the same mileage would show wear at the tooth tips. What Our Gearhead(R) Experts Are Saying:"The wide spread of compatibility means this ring fits the majority of modern MTB drivetrains, and the 8-bolt direct mount drops in without any fitment adjustment on a 55mm chainline setup."