Stainless Steel 5-bolt ChainringsDescription On a drivetrain with a steel chain and steel cogs, a steel chainring might seem like a logical choice. Most chainrings are made from aluminum, which is 35% softer than stainless steel and, therefore, wears out more quickly. That's why Surly created the Stainless Steel chainring, crafted from tough, rust resistant 304 grade stainless steel. While it will eventually wear out like any mechanical part, you can simply flip it around for double