Zoom Suspension Seatpost made from sturdy 6061‑T6 aluminum alloy, this seat post includes a coil spring + elastomer damper that absorbs road vibrations and trail shocks—perfect for biking across city streets, rough gravel tours, or mountain trails Zoom Bike Suspension Seatpost: 27.2 / 30.9 / 31.6 x 350 mm Shock Absorber Damper Bicycle Seat for E-Bike MTB BMX Features ZOOM Coil Spring Suspension Seatpost Ø27.2/30.9/31.6×350 mm (Diameter x Length). Bike Suspension Seat post features a progressive coil spring and elastomer...