Zoom 30.9 mm Alloy Suspension Seat Post, Black Go to amazon.com Related posts Top suspension seatpost 30.9 Feature2 bolt clampTolerance adjustable50 mm of TravelPreload Adjustable30.9 mm diameter, 350mm long DescriptionThe Zoom 30.9 mm Suspension Seat Post is an alloy post with 50mm of travel. For those looking for a little extra cushioning on their ride.