Primo Griffin BMX Guard Sprocket

Primo Griffin Guard Sprocket

The Primo Griffin guard sprocket is a CNC-machined guard sprocket designed for street riders who grind rails, ledges, and pegs where sprocket protection is essential. Machined from a single piece of 6061-T6 aluminum, this sprocket features an integrated guard that prevents hang-ups during grinds while protecting the drive teeth from damage. Includes adapter rings for compatibility with 19mm, 22mm, and 24mm crank spindles.

Key Features

• Integrated Guard Design – CNC-machined guard extends around the sprocket perimeter to create a protective barrier during grinds; allows the guard to contact obstacles instead of the drive teeth, preventing hang-ups and sprocket damage
• CNC-Machined from Single Piece 6061-T6 Aluminum – Machined from one solid aluminum block rather than assembled from multiple pieces; creates stronger construction with no weak points at joints; T6 heat treatment maximizes hardness and wear resistance
• Multiple Spindle Compatibility (19mm, 22mm, 24mm) – Includes adapter rings to properly center the sprocket on different spindle sizes; provides universal compatibility across modern BMX cranks
• Two Mounting Holes – Dual mounting points provide secure attachment to crank arms; standard spacing works with most BMX cranks
• Drive Sprocket Bolt Hole – Additional hole accommodates regular drive sprocket bolts for 23T and larger sizes, providing alternative mounting options
• 6mm Thickness – Substantial material thickness provides durability for repeated grind contact and hard impacts

Technical Specifications

• Material: 6061-T6 aluminum, CNC-machined from single piece
• Tooth Count Options: 25T, 28T
• Chain Compatibility: 1/8″ teeth (1/2″ × 1/8″ chain)
• Spindle Compatibility: 19mm, 22mm, 24mm (adapter rings included)
• Thickness: 6mm
• Mounting: 2 crank bolt holes, plus drive sprocket bolt hole (23T+)
• Guard: Integrated chain guard

Compatibility and Ideal Use Cases

This sprocket fits cranks with standard two-hole sprocket mounting patterns and works with 19mm, 22mm, or 24mm spindles using the appropriate adapter ring. Best suited for street riders who grind rails, ledges, and pegs where sprocket protection is critical. The guard design allows riders to grind drive-side without worrying about sprocket damage or hang-ups that can stop momentum or cause crashes. The 25T option provides quicker acceleration and easier technical riding, while the 28T offers higher top speed and easier sustained pedaling. The single-piece CNC construction ensures the guard won't separate from the sprocket body during hard impacts or grind contact. Not necessary for riders who don't grind or who run their chain on the non-drive side. The 6mm thickness makes this sprocket more substantial than standard sprockets, providing the durability needed for serious street abuse.