Construction: OCLV Carbon Fibre shaft. One bolt-head mechanism offers easy fore-aft and infinite angle adjustment. Provides seat angle range of 75 to 82 degrees. Includes 35mm dual-position offset head. 10mm offset head sold separately. Oversized saddle rail clamps sold separately. Part Numbers 42663 & 425664 are UCI-legal with integrated carbon heads and require seatpost clamp 425665.