Zipp Service Course SL Stem - 90mm 31.8 Clamp +/-17 1 1/8" Aluminum Matte BLK B2 Model=Grip Drive HP Pump Perfect shifting through better design

Perfect shifting through better design even through the toughest gravel terrain

Flow is controlled by an internal ball valve controlled by an intergrated external lever

so refining position can produce some of the biggest aero gains of all

Will work with multiple front chain rings while maintaining proper chain tension

Zipp Service Course SL Stem - 90mm 31.8 Clamp +/-17 1 1/8" Aluminum Matte BLK B2 Model=Grip Drive HP Pump Perfect shifting through better designZipp Service Course SL Stem 90mm 31. 8 Clamp + 17 1 1 8" Aluminum Matte Black B2. The Zipp Service Course SL Stem crafted from 7075 aluminum features a shape thats strong and lightweight resulting in a 1. 85 grams per newton meter of stiffness. That results in no flex sprints and accelerations. Forged AL 7075 Machined and relieved faceplate Features titanium hardware with TORX heads on all bolts for precision torque readings and ease of adjustment