The 3T Ionic 25 Pro Setback Seatpost is a new seatpost design which features the sophisticated and robust, 3T exclusive DiffLock seat clamp. Ionic 25 has placed the seat clamp assembly 25mm behind the centre-line of the seatpost giving athletes it option of a more rearward position on shorter framsets. The splined alloy DiffLock coupling on this 3T seatpost is a highly-accurate method of setting the saddle angle which needs only lightweight clamping by side-mounted bolts. It's particularly useful for fine adjustment of saddle setback which can be done without impacting the angle of the saddle. Finally, the 3T Ionic 25 Pro Setback Seatpost has been constructed using an aluminium alloy with a shot-peened and black anodized finish with the white 3T Pro stripe. 3T Ionic 25 Pro Setback Seatpost Features Weight: 235 g (31.6 mm x 280 mm) Length: 280, 350 mm Diameter: 27.2, 31.6 mm ∅ Material: AL-Alloy Bolts: Stainless steel Saddle Clamp: Alloy DiffLock Setback: 25 mm Finish: Shot peened/ Black anodized Certification: CEN