39T

The Box Two Chainring at J&R Bicycles is designed for lightweight durability to deliver high-powered BMX speed and control smoothly and efficie...

The MCS Chainring-4-Bolt at J&R Bicycles is made from CNC machined aluminum alloy to keep it durable without weighing much while providing cons...

The Rennen Chainring-4-Bolt at J&R Bicycles is made from airplane-grade 7075-T6 aluminum alloy which is 83-percent stronger than the standard 6...

The Rennen Pentacle Chainring-5-Bolt is made from airplane-grade 7075-T6 aluminum alloy which is 83-percent stronger than the standard 6061-T6 chai...

The story of the Rennen Raycelite Decimal Sprocket begins with one Dad’s mission to build the lightest micro-mini possible for his 3-year-old son, ...