Wolf Tooth Components GeoShift HS ZS44 Upper/EC49 Lower (Perf) LongAdjust the geometry of your bike by changing the head tube angle by 1 with the GeoShift Performance Angle Headset Allows you to change the head tube angle by 1 to make for a slacker geometry for added stability on fast descents, or by +1 by using the opposite orientation of the headset to make for a steeper geometry for quicker steering with maximum front wheel traction Features a design in which the bearings sit at an angle that aligns with the