Highly-tuned and flexible carbon fiber composite leaf spring design reduces road shock and absorbs vibration The defined flex allows a maximum of 20mm of leaf spring travel with zero lateral twist Floating Flip Head keeps saddle level during compression and can be rotated to achieve the perfect fore/aft position Designed for round saddle rails up to 7mm diameter Not shimmable, designed for 27.2mm seat tubes Not compatible with Di2 seatpost mounted batteries Min/Max insertions depth = 110mm/ 210mm Max rider weight is 100kg 240g