Upgrade your ride with the ultimate bump-absorbing comfort. The SR Suntour Suspension Seatpost provides 25mm of suspension travel. Features 25mm of suspension travel Additional adaptors to fit seat posts up to 30.9mm Specs Maximum Extension: 240mm Total Length: 350mm Diameter: 27.2mm Compatibility Compatible with all Aventon ebike models except Ramblas. Select Aventon ebike models will need to use the included additional adaptor for a secure fit. These adaptor sleeves come with your order