Promax 4-Bolt Chainring Size:40 minimizing rear triangle deflection

minimizing rear triangle deflection

4 degrees so what you get it is a super fast engaging hub

DST (Durable Stretch Technology) constructed of four-way HEX-Stretch fabric provides excellent mobility with heavy-duty durability

The FLAT bend bar is available in 2 other sizes as well

Coated stainless steel inner wire for smooth cable braking

Promax 4-Bolt Chainring Size:40 minimizing rear triangle deflectionMachined 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