Choose your top cup from the list to match the top of your headtube and fork steerer and then choose the bottom cup to match the bottom of your headtube and fork steerer r series headsets are the perfect choice for those looking for a top quality precision headset with lightweight cnc alloy cups premium grade bearings and fine tuning technical features that are not included on most other headsets gusset r series headsets are great headsets in their own right are very competitively priced an