4-Bolt 104 BCD Chainrings

Machined from high-end aluminum, Promax 4-bolt 104 BCD chainrings are designed to handle the torque and stress of modern BMX racing and are fully capable in other single speed applications.

• CNC Machined from high grade 6061-T6 series aluminum for high strength while providing weight savings
• Designed to be used with most cranksets and spiders that utilize a 4-bolt 104 BCD chainring