The MT was designed with a ZS44 upper and ZS56 lower headset standard. There are numerous aftermarket angle adjust headsets available in this standard. We designed the frame to be compatible with a maximum of 1 degree of adjustment, meaning +1 or -1 degree of adjustment. Any angle adjustment outside these specifications is not approved and will result in a voided warranty. See “What travel fork is the MT designed to use” for more information.