Promax 4-Bolt Single Chainring 104mm BCD Black

Machined from high-grade aluminium, 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.Features: CNC-machined from high-quality 6061-T6 series aluminium for high strength and weight savings. 4-point BCD fixing, diameter 104 mm. Thickness: 5 mm. Chain width: 3/32u2019.