On a drivetrain with a steel chain and steel cogs, why wouldn�۪t you want to use a steel chainring? Most chainrings on the market are made from aluminum, which is 35% softer than stainless steel. A softer metal means a shorter lifespan. Enter the Surly Stainless Steel chainring, made from 304 grade stainless. You can now have an all-steel drivetrain that will love you long time. Stainless, as it�۪s name implies, is a rust and corrosion-resistant alloy steel that is known for it�۪s toughness. Like all things mechanical, it will eventually wear out. When it does, simply flip the chainring around and you�۪ll get another lifespan out of it. Our chainring is ideal for single-speed, fixed gear or tandem timing chain applications. It is not ramped or pinned for shifting assistance, so shifting will be a bit slower if using these with a front derailleur.