Machined from aerospace-grade AL6061 and teamed up with angular contact bearings. The Descend headset guarantees super-smooth control so you can focus on the trail. Our top and bottom headset pieces are available separately. Technical Lower Cup ZS66/46 Steerer tube 46 mm Headtube size 66 mm Stack height 3.5 mm Weight 100 g Keep you bicycle well maintained by replacing worn or damaged components. Headsets take a fair beating on bicycles and regular maintenance and replacement when required ensures you get the best ride quality. If you're a DIY sort of person, they can also help you with bicycle specific tools to do the job. Or, you can book your bike into our workshop and let our skilled mechanics do the job for you.