The RockShox Reverb seatpost gives you 125mm of infinite seat height adjustment and control of your return speed in a hydraulically actuated remote package. When you're ripping through rolling terrain, cranking the pedals one minute and getting off the back of the bike the next, no seat height is "just right." A custom sealing system means the plush and consistent feel of this seat post won't degrade no matter how much the weather does. The Stealth seatpost features an internally routed cable for a clean look. Compatible with internal seatpost cable routed frames only. FEATURES: Diameter: 30.9mm Length: 420mm Travel: 125mm