RITCHEY COMP CARTRIDGE 51.9/40.0/8mm 45° HEADSET BEARING no_product_type Compatible with Shimano Di2 EW-RS910

Compatible with Shimano Di2 EW-RS910 junction box

Clamp Mechanism: Dual Bolt

The Ritchey Comp Cartridge Semi-Integrated ZS Upper Headset features full complement stainless steel angular contact cartridge bearings packed with Ritchey high-webbing grease

The silicone hose port and magnetic hose clasp keeps the optional hydration reservoir hose securely in place

Pins - 9 per side mounted from the back

RITCHEY COMP CARTRIDGE 51.9/40.0/8mm 45° HEADSET BEARING no_product_type Compatible with Shimano Di2 EW-RS910Genuine cartridge bearing for Ritchey Comp headset. Specification 45 angular contact bearing Contents 1 x Ritchey Comp Cartridge Headset Bearing