{"product_id":"wolf-tooth-premium-zs-headsets-zero-stack","title":"Wolf Tooth Premium ZS Headsets - Zero Stack","description":"\u003cp\u003e\u003cstrong\u003eWolf Tooth Premium ZS Headsets – Zero Stack\u003c\/strong\u003e are engineered for riders who demand long-term durability, precise steering feel, and refined finishing details. Machined in-house in Minnesota from aircraft-grade 6061 aluminum, these Zero Stack headsets are designed to be lightweight, strong, and exceptionally well sealed against the elements.\u003c\/p\u003e\n\n\u003cp\u003eThe ZS (Zero Stack) configuration is intended for frames with internal bearing cups pressed into the head tube. With compatibility for 44mm upper and 56mm lower head tube inner diameters, the Wolf Tooth Premium ZS Headsets offer a clean, integrated look while maintaining easy serviceability. Uppers and lowers are sold separately, allowing you to match your exact frame requirements and color preference.\u003c\/p\u003e\n\n\u003cp\u003eAt the core of this Premium ZS Headset are Enduro stainless steel sealed bearings, backed by a lifetime warranty. These bearings are protected by three levels of custom sealing, including an O-ring around the steerer tube and a molded upper lip seal to defend against water intrusion. The lower assembly features a dual-lip crown race seal designed to shield the lower bearing from mud, grit, and harsh riding conditions.\u003c\/p\u003e\n\n\u003ch3\u003eWolf Tooth Premium ZS Headsets – Upper Assembly Features\u003c\/h3\u003e\n\u003cul class=\"specs_at_a_glance\"\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIntegrated Top Cap:\u003c\/strong\u003e Ultralight stem cap with integrated spacer.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStack Height Options:\u003c\/strong\u003e 6mm, 15mm, and 25mm top cover choices.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSealing:\u003c\/strong\u003e O-ring seal at steerer tube plus custom-molded upper lip seal.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHardware Included:\u003c\/strong\u003e Aluminum bolt and star nut (for steel or aluminum steerer tubes only).\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eLower Assembly Features\u003c\/h3\u003e\n\u003cul class=\"specs_at_a_glance\"\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual-Lip Crown Race Seal:\u003c\/strong\u003e Enhanced protection for lower bearing in demanding conditions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEnduro Stainless Bearings:\u003c\/strong\u003e Sealed and covered by a lifetime warranty.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrecision Machining:\u003c\/strong\u003e All components produced in-house from aircraft-grade aluminum.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul class=\"specs_at_a_glance\"\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e 6061 aluminum\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 55–58g (varies by configuration)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBearing Bevel Angle:\u003c\/strong\u003e 36° x 45°\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStem Cap Bolt Torque:\u003c\/strong\u003e 2–3 Nm (light grease on threads only)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e ZS frames with 44mm upper and 56mm lower head tube inner diameter\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n\u003cp\u003eThe included star nut is designed for steel or aluminum steerer tubes only. Never use a star nut with a carbon steerer—use a compression plug instead (sold separately). For optimal installation and to avoid damaging crown race seals, Wolf Tooth recommends using a dedicated crown race installation adapter.\u003c\/p\u003e\n\n\u003ch3\u003eFinal Take\u003c\/h3\u003e\n\u003cp\u003eThe Wolf Tooth Premium ZS Headsets – Zero Stack combine meticulous machining, industry-leading sealing, and premium stainless bearings into a headset built for serious riders. Whether you're upgrading a performance road build, a gravel bike, or a trail machine, this Zero Stack headset delivers smooth steering, lasting protection, and a refined finish that elevates any frame.\u003c\/p\u003e","brand":"Wolf Tooth","offers":[{"title":"Upper \/ ZS44\/28.6 6mm Stack \/ Black","offer_id":45079731503148,"sku":"ZS44U-5MM-BLK","price":74.95,"currency_code":"USD","in_stock":true},{"title":"Upper \/ ZS44\/28.6 6mm Stack \/ Red","offer_id":45079731535916,"sku":"ZS44U-5MM-RED","price":74.95,"currency_code":"USD","in_stock":true},{"title":"Upper \/ ZS44\/28.6 6mm Stack \/ Blue","offer_id":45079731568684,"sku":"ZS44U-5MM-BLU","price":74.95,"currency_code":"USD","in_stock":true},{"title":"Upper \/ ZS44\/28.6 6mm Stack \/ Orange","offer_id":45079731601452,"sku":"ZS44U-5MM-ORG","price":74.95,"currency_code":"USD","in_stock":true},{"title":"Upper \/ ZS44\/28.6 6mm Stack \/ Gold","offer_id":45079731634220,"sku":"ZS44U-5MM-GLD","price":74.95,"currency_code":"USD","in_stock":true},{"title":"Upper \/ ZS44\/28.6 6mm Stack \/ Raw Silver","offer_id":45079731699756,"sku":"ZS44U-5MM-RSIL","price":74.95,"currency_code":"USD","in_stock":true},{"title":"Upper \/ ZS44\/28.6 6mm Stack \/ Ultraviolet Purple","offer_id":45079731732524,"sku":"ZS44U-5MM-PRU","price":74.95,"currency_code":"USD","in_stock":true},{"title":"Upper \/ ZS44\/28.6 15mm Stack \/ Black","offer_id":45079731765292,"sku":"ZS44U-15MM-BLK","price":69.95,"currency_code":"USD","in_stock":true},{"title":"Upper \/ ZS44\/28.6 25mm Stack \/ Black","offer_id":45079731798060,"sku":"ZS44U-25MM-BLK","price":69.95,"currency_code":"USD","in_stock":true},{"title":"Upper \/ ZS44\/28.6 25mm Stack \/ Red","offer_id":45079731830828,"sku":"ZS44U-25MM-RED","price":69.95,"currency_code":"USD","in_stock":true},{"title":"Upper \/ ZS44\/28.6 25mm Stack \/ Blue","offer_id":45079731863596,"sku":"ZS44U-25MM-BLU","price":69.95,"currency_code":"USD","in_stock":false},{"title":"Upper \/ ZS44\/28.6 25mm Stack \/ Orange","offer_id":45079731896364,"sku":"ZS44U-25MM-ORG","price":69.95,"currency_code":"USD","in_stock":false},{"title":"Upper \/ ZS44\/28.6 25mm Stack \/ Gold","offer_id":45079731929132,"sku":"ZS44U-25MM-GLD","price":69.95,"currency_code":"USD","in_stock":true},{"title":"Lower \/ ZS56\/40 \/ Black","offer_id":45079731994668,"sku":"ZS56L-40-BLK","price":64.95,"currency_code":"USD","in_stock":true},{"title":"Lower \/ ZS56\/40 \/ Red","offer_id":45079732027436,"sku":"ZS56L-40-RED","price":64.95,"currency_code":"USD","in_stock":true},{"title":"Lower \/ ZS56\/40 \/ Blue","offer_id":45079732060204,"sku":"ZS56L-40-BLU","price":64.95,"currency_code":"USD","in_stock":true},{"title":"Lower \/ ZS56\/40 \/ Orange","offer_id":45079732092972,"sku":"ZS56L-40-ORG","price":64.95,"currency_code":"USD","in_stock":true},{"title":"Lower \/ ZS56\/40 \/ Gold","offer_id":45079732125740,"sku":"ZS56L-40-GLD","price":64.95,"currency_code":"USD","in_stock":false},{"title":"Lower \/ ZS56\/40 \/ Raw Silver","offer_id":45079732158508,"sku":"ZS56L-40-RSIL","price":64.95,"currency_code":"USD","in_stock":true},{"title":"Lower \/ ZS56\/40 \/ Ultraviolet Purple","offer_id":45079732191276,"sku":"ZS56L-40-PRU","price":64.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/7684\/9196\/files\/wolf-tooth-premium-zs-headsets-zero-stack-5482648.jpg?v=1771562175","url":"https:\/\/racycles.com\/es\/products\/wolf-tooth-premium-zs-headsets-zero-stack","provider":"RA Cycles","version":"1.0","type":"link"}