Ritchey WCS Switch Upper Headset - Switch System Compatibility Only ZS55/28.6 Upper 28.6 Threadless BLK CheckoutTitle=Garmin Tacx Alpine Trainer Extreme Gradual taper technology (XGT) Rate Range:500-550Lbs

Ritchey WCS Switch Upper Headset Switch System Compatibility Only ZS55 28.6 Upper 28.6 Threadless BLK CheckoutTitle=Garmin Tacx Alpine Trainer Extreme Gradual taper technology (XGT) Rate Range:500 550Lbs Extreme Gradual taper technology (XGT) spreads the load out over a greater area of the bar to minimize breaks and bends Bar Clamp Diameter (mm) 31 } Using cold forging technology rather than CNC machining gives the stem an incredibly smooth and unique shape STC (Shark Tooth Clamping) for a secure bar grip and less slipping Weight saving internal machining S Upper ZS55 S Cables are routed from the handlebar into the headset conduit which sits on the underside of the Switch Stem and then travel through an opening on the front of the WCS Switch headset spacers before passing through two channels on the top of the headset and into the frame