![Upper / ZS44/28.6 6mm Stack / Purple Wolf Tooth Premium ZS Headsets - Zero Stack](http://www.wolftoothcomponents.com/cdn/shop/products/WT-ZS44U-5MM-PRP-01_35d6d7a8-9ad4-44a1-ae56-591d57d85d84.jpg?v=1702067571&width=2000)
![Upper / ZS44/28.6 6mm Stack / Blue Wolf Tooth Premium ZS Headsets - Zero Stack](http://www.wolftoothcomponents.com/cdn/shop/products/WT-ZS44U-5MM-BLU-01.jpg?v=1702067752&width=1024)
![Lower / ZS56/40 / Blue Wolf Tooth Premium ZS Headsets - Zero Stack](http://www.wolftoothcomponents.com/cdn/shop/products/WT-ZS56-40-BLU-01.jpg?v=1702067761&width=2000)
![Wolf Tooth Premium ZS Headsets - Zero Stack](http://www.wolftoothcomponents.com/cdn/shop/products/WT-ZS44U-15MM-BLU-01.jpg?v=1702067943&width=1024)
![Wolf Tooth Premium ZS Headsets - Zero Stack](http://www.wolftoothcomponents.com/cdn/shop/products/HEADSET_CROSS_SECTION_LARGE_1000px.jpg?v=1702067387&width=1024)
![Upper / ZS44/28.6 25mm Stack / Blue Wolf Tooth Premium ZS Headsets - Zero Stack](http://www.wolftoothcomponents.com/cdn/shop/products/WT-ZS44U-25MM-BLU-01_69de62b1-5296-412f-b152-47b200a8d9d0.jpg?v=1702067396&width=2000)
![Upper / ZS44/28.6 6mm Stack / Gold Wolf Tooth Premium ZS Headsets - Zero Stack](http://www.wolftoothcomponents.com/cdn/shop/products/WT-ZS44U-5MM-GLD-01.jpg?v=1702067400&width=1024)
![Upper / ZS44/28.6 15mm Stack / Gold Wolf Tooth Premium ZS Headsets - Zero Stack](http://www.wolftoothcomponents.com/cdn/shop/products/WT-ZS44U-15MM-GLD-01.jpg?v=1702067403&width=1024)
![Upper / ZS44/28.6 25mm Stack / Gold Wolf Tooth Premium ZS Headsets - Zero Stack](http://www.wolftoothcomponents.com/cdn/shop/products/WT-ZS44U-25MM-GLD-01.jpg?v=1702067405&width=2452)
![Lower / ZS56/40 / Gold Wolf Tooth Premium ZS Headsets - Zero Stack](http://www.wolftoothcomponents.com/cdn/shop/products/WT-ZS56-40-GLD-01.jpg?v=1702067567&width=2000)
![Wolf Tooth Premium ZS Headsets - Zero Stack](http://www.wolftoothcomponents.com/cdn/shop/products/WT-ZS44U-15MM-PRP-01.jpg?v=1702067574&width=2000)
![Wolf Tooth Premium ZS Headsets - Zero Stack](http://www.wolftoothcomponents.com/cdn/shop/products/WT-ZS44U-25MM-PRP-01_eaeab231-18e9-4ac9-9442-3bb47be41aa6.jpg?v=1702067577&width=2392)
![Lower / ZS56/40 / Purple Wolf Tooth Premium ZS Headsets - Zero Stack](http://www.wolftoothcomponents.com/cdn/shop/products/WT-ZS56-40-PRP-01_c6dc3fee-5455-4f86-8edd-ca7df30cb423.jpg?v=1702067581&width=2000)
![Upper / ZS44/28.6 25mm Stack / Green Wolf Tooth Premium ZS Headsets - Zero Stack](http://www.wolftoothcomponents.com/cdn/shop/products/WT-ZS44U-25MM-GRN-01.jpg?v=1702079265&width=2000)
![Upper / ZS44/28.6 15mm Stack / Green Wolf Tooth Premium ZS Headsets - Zero Stack](http://www.wolftoothcomponents.com/cdn/shop/products/WT-ZS44U-15MM-GRN-01.jpg?v=1702079270&width=1024)
![Upper / ZS44/28.6 6mm Stack / Green Wolf Tooth Premium ZS Headsets - Zero Stack](http://www.wolftoothcomponents.com/cdn/shop/products/WT-ZS44U-5MM-GRN-01.jpg?v=1702079272&width=1024)
![Lower / ZS56/40 / Green Wolf Tooth Premium ZS Headsets - Zero Stack](http://www.wolftoothcomponents.com/cdn/shop/products/WT-ZS56-40-GRN-01.jpg?v=1702079274&width=2000)
![Upper / ZS44/28.6 6mm Stack / Red Wolf Tooth Premium ZS Headsets - Zero Stack](http://www.wolftoothcomponents.com/cdn/shop/products/WT-ZS44U-5MM-RED-01.jpg?v=1702067585&width=1024)
![Upper / ZS44/28.6 15mm Stack / Red Wolf Tooth Premium ZS Headsets - Zero Stack](http://www.wolftoothcomponents.com/cdn/shop/products/WT-ZS44U-15MM-Red-01.jpg?v=1702145337&width=2000)
![Upper / ZS44/28.6 25mm Stack / Red Wolf Tooth Premium ZS Headsets - Zero Stack](http://www.wolftoothcomponents.com/cdn/shop/products/WT-ZS44U-25MM-Red-01.jpg?v=1702145341&width=2000)
![Lower / ZS56/40 / Red Wolf Tooth Premium ZS Headsets - Zero Stack](http://www.wolftoothcomponents.com/cdn/shop/products/WT-ZS56-40-RED-01.jpg?v=1702145343&width=2000)
![Upper / ZS44/28.6 6mm Stack / Black Wolf Tooth Premium ZS Headsets - Zero Stack](http://www.wolftoothcomponents.com/cdn/shop/products/WT-ZS44U-5MM-BLK-01.jpg?v=1702079087&width=1024)
![Upper / ZS44/28.6 15mm Stack / Black Wolf Tooth Premium ZS Headsets - Zero Stack](http://www.wolftoothcomponents.com/cdn/shop/products/WT-ZS44U-15MM-BLK-01.jpg?v=1702079089&width=1024)
![Upper / ZS44/28.6 25mm Stack / Black Wolf Tooth Premium ZS Headsets - Zero Stack](http://www.wolftoothcomponents.com/cdn/shop/products/WT-ZS44U-25MM-BLK-01.jpg?v=1702079091&width=2500)
![Lower / ZS56/40 / Black Wolf Tooth Premium ZS Headsets - Zero Stack](http://www.wolftoothcomponents.com/cdn/shop/products/WT-ZS56-40-BLK-01.jpg?v=1702079095&width=2000)
![Upper / ZS44/28.6 6mm Stack / Orange Wolf Tooth Premium ZS Headsets - Zero Stack](http://www.wolftoothcomponents.com/cdn/shop/products/WT-ZS44U-5MM-ORG-01_e7ce0ddd-2ef9-4317-bef0-0b5054fdf282.jpg?v=1702079098&width=2380)
![Upper / ZS44/28.6 15mm Stack / Orange Wolf Tooth Premium ZS Headsets - Zero Stack](http://www.wolftoothcomponents.com/cdn/shop/products/WT-ZS44U-15MM-ORG-01_1c19d712-e1f9-4e49-821a-7c2538ceffe2.jpg?v=1702079100&width=2000)
![Upper / ZS44/28.6 25mm Stack / Orange Wolf Tooth Premium ZS Headsets - Zero Stack](http://www.wolftoothcomponents.com/cdn/shop/products/WT-ZS44U-25MM-ORG-01.jpg?v=1702078905&width=2000)
![Lower / ZS56/40 / Orange Wolf Tooth Premium ZS Headsets - Zero Stack](http://www.wolftoothcomponents.com/cdn/shop/products/WT-ZS56-40-ORG-01.jpg?v=1702078908&width=2000)
![Upper / ZS44/28.6 6mm Stack / Nickel Wolf Tooth Premium ZS Headsets - Zero Stack](http://www.wolftoothcomponents.com/cdn/shop/products/WT-ZS44U-5MM-Ni-01.jpg?v=1702078911&width=2000)
![Upper / ZS44/28.6 15mm Stack / Nickel Wolf Tooth Premium ZS Headsets - Zero Stack](http://www.wolftoothcomponents.com/cdn/shop/products/WT-ZS44U-15MM-Ni-01.jpg?v=1702078914&width=2591)
![Upper / ZS44/28.6 25mm Stack / Nickel Wolf Tooth Premium ZS Headsets - Zero Stack](http://www.wolftoothcomponents.com/cdn/shop/products/WT-ZS44U-25MM-NI-01.jpg?v=1702078918&width=2376)
![Wolf Tooth Premium ZS Headsets - Zero Stack](http://www.wolftoothcomponents.com/cdn/shop/products/WT-ZS56-40-Ni-01.jpg?v=1702078921&width=2000)
![Upper / ZS44/28.6 6mm Stack / Raw Silver Wolf Tooth Premium ZS Headsets - Zero Stack](http://www.wolftoothcomponents.com/cdn/shop/files/WT-ZS44U-5MM-Ni-01_37dfded8-b489-4196-ae8f-a88dd1bfa16e.jpg?v=1709655894&width=2000)
![Upper / ZS44/28.6 6mm Stack / Raw Silver Wolf Tooth Premium ZS Headsets - Zero Stack](http://www.wolftoothcomponents.com/cdn/shop/files/WT_ZS44U-5MM-RSIL.jpg?v=1709660987&width=2000)
Wolf Tooth Premium ZS Headsets - Zero Stack
ZS44U-5MM-PRP
Pairs well with
Wolf Tooth headsets are machined here in our Minnesota shop with aircraft-grade 6061 aluminum. They are designed to be lightweight, strong, and durable. Our headsets have three levels of industry-leading custom sealing to protect bearings from the elements and prolong the life of the headset. Available in a variety of colors. These ZS headsets are for frames with internal bearing cups that are pressed into the frame. Premium Headsets with Enduro stainless steel bearings have a lifetime warranty.
Compatibility
- Any frame that uses ZS (Zero Stack) headsets with 44mm upper and 56mm lower head tube inner diameter.
- Uppers and lowers sold separately.
- Enduro stainless steel sealed bearings included on both the upper and lower.
- Upper headsets ship with a star nut which can only be used on forks with steel or aluminum steerer tubes. For forks with carbon steerer tubes you will need a compression plug (sold separately). (Never use a star nut on a carbon steerer tube).
Upper assembly features:
- Ultralight stem cap with integrated spacer plus an aluminum bolt and a star nut.
- 6, 15 and 25 mm stack height top cover options (6mm cover = 6mm total stack, 15mm cover = 15 total stack, 25mm cover = 25mm total stack).
- O-ring seal prevents water intrusion around steerer tube.
- Custom-molded upper lip seal provides additional protection for upper bearing.
Lower assembly features:
- Custom-molded dual-lip seal on the crown race protects lower bearing in the toughest conditions.
- All components precision machined in-house at Wolf Tooth from aircraft grade aluminum to ensure the highest level of quality.
- Service and additional parts available.
Recommendations
The Wolf Tooth crown race installation adapter will help avoid damaging the crown race seals.
Related Products
Tech Specs
Weight: 55-58g
Material: 6061 aluminum
Stem Cap Bolt Torque Spec: 2-3 Nm with light
grease on threads only
Made in the USA
WARNING
Handling this product will expose you to chemicals, including lead, known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling. For further information go to www.P65Warnings.ca.gov.