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. Check out all the sizes we carry: Sizes: 94mm BCD x 30t, 31t, 32t, 33t, 34t, 35t and 36t (works with 5-8-speed chains) 104mm BCD x 32t, 33t, 34t, 35t and 36t (works with 5-8-speed chains) 110mm BCD x 34t, 35t, 36t, 38t (works with 5-8-speed chains) 110mm BCD x 38t*, 39t, 40t, 42t, 44t, 46t, 47t, 48t, 49t and 50t (works with 5-9-speed chains) 130mm BCD x 38t, 39t, 40t, 42t, 44t, 46t, 47t, 48t, 49t and 50t (works with 5-9-speed chains) Want more? Check this!   Spew #15 - Chainrings Compatibility/Tech * Original 110mm BCD x 38t chainrings were made with a 2.2-2.3mm thick stock plate and require use of 5-8 speed chains. These were sold through summer 2007.  New stock, as of summer/fall 2007, will have a narrower 2.1mm tooth thickness and are compatible with 6-9 speed chains.