Adjust the geometry of your bike by changing the head tube angle by 1º with the GeoShift Performance Angle Headset Allows you to change the head tube angle by 1º to make for a slacker geometry for added stability on fast descents, or by +1º 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 steerer tube. This compares to angle headsets that have bearings that sit flat, which adds unneeded friction and stress on the bearings and can cause creaking Enduro black oxide bearings and three levels of superior custom sealing protect bearings from the elements and prolong the life of the headset Choose short version for headtubes with 90114mm length and long version for headtubes with 115-140mm length Sold as a set, upper/lower Made in MN, USA