ACS Maindrive integrated step down (AKA Reducer) headsets will suit mini to expert sized frames with an integrated 1-1/8"" headtube and work with forks with a 1"" steerer tube. Featuring an aluminum cap, bearing cover and crown race with super-smooth rolling, precision 45×45 bearings.
- Suitable for 1-1/8"" integrated (41.8mm) frames with 1"" forks
- Crown Race: 26
- S.H.I.S Lower: IS42
- S.H.I.S Upper: IS42
- S.H.I.S. Stem Clamp Diameter: 25.4 Threadless
