BOX Two Step-down (AKA Reducer) integrated headsets will suit mini to expert sized frames with an integrated 1-1/8" headtube and work with forks with a 1" steerer tube

Spec:

• two 1-1/8" sealed bearings.
• 1" step down bearing race & hardware
• 1" star-nut
  
  Set and forget! The Box Two Integrated headsets feature an aluminum top cap, CNC-machined bearing cover, and split crown race with super-smooth rolling, precision 45x45 bearings. Built to withstand multiple T-bars over the finish line dubs, this headset is a nicely priced precision component. Finish Anodized w/ laser-etched graphics Material 6061-T6 Aluminum Origin Designed in USA/Made in Taiwan SHIS IS 42/28.6 | IS 42/30 Weight 85 grams / 3.0 ounces