Troy Lee Designs D4 Polyacrylite MIPS BMX Race Helmet-Qualifier Blue/White head-tube-size-1-1-8-to-1-step-down Sprockets that come with 19mm

Sprockets that come with 19mm or 22mm hat washers are 15/16″ / 24mm with the hat washer removed

Cold forged & CNC machined 6061

The AC-2 hub features revolutionary bearing installation and function never seen before in a bicycle hub

Spindle Material: Chromoly Steel

Troy Lee Designs D4 Polyacrylite MIPS BMX Race Helmet-Qualifier Blue/White head-tube-size-1-1-8-to-1-step-down Sprockets that come with 19mmThe Troy Lee Designs D4 Polyacrylite MIPS BMX Race Helmet Qualifier Blue White delivers top tier protection in a lightweight, budget friendly shell. With the same safety and comfort features as its high end counterparts, this helmet includes Mips C2 brain protection and an advanced ventilation system for airflow during intense rides. Its precision fit, impact absorbing design, and emergency ready cheek pads make it a trusted choice for serious racers.