Wolf Tooth Premium ZS56 Headset Lower Extender Cup

These lower headset cup extenders allow you to adjust the geometry of your bike frame by increasing the effective fork length by 10mm. They allow you to do things like use a rigid fork on a suspension-corrected frame or use a fork with a shorter axle-to-crown height rather than what the frame was designed to use. They can also be used to increase the bottom bracket height and lower the headtube angle. Wolf Tooth Precision Headsets are machined in the USA out of aircraft-grade 6061 aluminum with superior sealing for protection against the elements. These ZS headsets are for frames with internal bearing cups that are pressed into the frame. COMPATIBILITY Any frame that uses a zero stack headset with a 56mm lower head tube inner diameter Upper and lowers headsets sold separately Enduro stainless steel sealed bearings included FEATURES Custom molded dual lip seal on the crown race to protect lower bearing in the toughest conditions Service and additional parts available SPECIFICATIONS Weight: 62g Material: 6061-T6 aluminum, Stainless Steel Bearing Includes: Cup, bearing, and race Made in the USA The Story Wolf Tooth was founded to design and manufacture precision cycling products that emphasize function, performance, and reliability to meet the needs of our fellow racers and riders. We are a group of cyclists in Minneapolis, Minnesota that spend a lot of time talking about bike components. Like most detail-obsessed riders, we're always looking for new products that could make our bikes lighter, faster, more versatile, or more reliable. We pride ourselves on delivering premium products of the highest quality.