Well, if you want a precise fit you also need to measure your depth from the top of the compression ring to the top of the head tube. 2mm works for most people and is the minimum in this design, a few people have had deeper ones to fit headsets with particularly proud compression rings.
Well, if you want a precise fit you also need to measure your depth from the top of the compression ring to the top of the head tube. 2mm works for most people and is the minimum in this design, a few people have had deeper ones to fit headsets with particularly proud compression rings.