Cane Creek Angleset complete kits include several angle-adjusting cups. A self-aligning feature between the bearings and the steerer-tube that ensures a solid fit.ZS49/28.6|ZS49/30 fits 49mm (1.5") straight head tube and 1-1/8" straight steerer-tube (1.5" to 1-1/8" conversion)Zero Stack (ZS) assemblies feature press-in cups with bearings inside the frameBearings self-align with steerer-tube under compressionOffset angle cups can be turned 180 degrees for slacker or steeper adjustmentsInterlok spacer compatibleItem SpecificationsSteerer Tube1-1/8" ThreadlessCrown Race39.7S.H.I.S UpperZS49S.H.I.S LowerEC49S.H.I.S. Clamp Diameter28.6