Reach adjust headset offering +/-6mm adjustment. Designed for frames with a 56mm upper and 56mm lower internal head tube using a straight 1 1/8" steerer tube. CNC-machined in-house in the UK from 6082-T6 aluminum and finished with a durable anodize finish. This spec is most commonly used with downhill bikes. Adjusts the geometry to better suit the individual rider by effectively increasing the top tube length Precision CNC-machined from 6082-T6 aluminum and anodized in the UK Includes top-cap, star nut, bearings and crown race table{border-collapse:collapse;width:100%;}td{text-align: left;padding: 8px;font-weight:350;}tr:nth-child(even){background-color:#f2f2f2}th{background-color:#eb212e;color:white;text-align:left;padding:8px;}.desc ul{font-size:24px;font-weight:600;margin-left:-25px;padding-top:35px;border-top:3px solid #f0f0f0;}.desc li{list-style:none;border-bottom:4px solid #eb212e;width:142px;} TECH SPECS Model Reach Adjust Headset S.H.I.S. ZS56/28.6 / ZS56/30 Stack 9.5mm/3.5mm Reach +/- 6mm Head tube Internal Diameter Upper: 56mm (ZS56) / Lower: 56mm (ZS56) Cup Insertion Depth Upper: 11.5mm / Lower: 11.5mm Upper Bearing 41mm OD, 45 x 45Adeg AC sealed bearing Lower Bearing 41mm OD, 45 x 45Adeg AC sealed bearing Fork Steerer Tube Size 1 1/8" Material 6082-T6 Aluminium Finish Anodized Color Black