ZOOM SPD-801 Dropper Seatpost Adjustable Height via Thumb Remote Lever - External Cable 30.9 Diameter 100mm TravelZOOM SPD 801E External Cable Routing 30. 9 Diameter tube with 100mm Travel 385mm Total Length SPEC: FORGED AL7075 Compatible with frames with external dropper seat post cable routing (check bike for suitable design.) Choose either Internal or External routed standard cable Suitable for seat post diameters of 30. 9 mm (check bike before purchase.) Cradle: 43 x 42 Angle: 5~+18 Offset: 3mm Weight: 635g = 1. 4lbs Zoom has been a leading supplier to the