Project 321

RG3 Road HGR Center Lock Rear Hub - 12x142mm

Project 321 RG3 Road HGR Center Lock Rear Hub is a precision-focused rear hub for modern road and gravel disc bikes running a 12x142mm thru-axle standard. Built to keep rolling resistance low without sacrificing pickup, it uses M-Pulse magnet-sprung pawls to deliver quick, consistent engagement with minimal coasting drag—ideal for fast group rides, punchy gravel accelerations, and technical sections where timing matters.

What matters on the road and in the dirt

• M-Pulse Magnet-Sprung Pawls - engineered for ultra-low drag while still providing instant engagement when power is applied
• 12x142mm Rear Thru-Axle Fit - correct spacing for today’s road and gravel disc frames, improving stiffness and rear-end tracking under load
• Center Lock Rotor Interface - clean, secure disc rotor mounting for modern road/gravel braking setups
• 6-Lock Upgrade Option - ships as Center Lock, with the ability to convert using the optional 6-Lock assembly for riders standardizing on 6-bolt rotors
• Made in Canada - quality-focused manufacturing for riders prioritizing durability and long service life