2mm square drive - nominal 6mm outer diameter

the rotors are best paired with Hope hubs and Hope brake mounts

12mm Bottom

Pros: Light breathable design is comfortable and low-profile so you'll be more likely to want to wear them

It has been anatomically designed for smaller sit bones and kids riding positions

Crank Brothers Synthesis E Boost Wheelset - XD Driver - Black - F-15x110mm Boost R-12x148mm Boost - 6 Bolt - Front and Rear - 27.5 Inch eBay 2mm square drive - nominalThe Crank Brothers Synthesis E Boost Wheelset offers front and rear specific rims offering the right stiffness and compliance characteristics to suit their required role. The front and rear specific inner rim widths are optimised to run wider tyres up front and narrower tyres in the rear. Compliant Front Wheel: Compliant tuned front wheel improves handling and maximises grip and control in the turns. A wider inner rim width supports wider tyre