SDG I-Beam Micro Carbon Seatposts. I-Beam technology eliminates seat rails for a single beam incoporated into the saddle shell. I-Beam provides the widest range of fore and aft adjustments available and uses simple 1-bolt clamp. SDG I-Beam Micro Carbon Seatposts. I-Beam technology eliminates seat rails for a single beam incoporated into the saddle shell. I-Beam provides the widest range of fore and aft adjustments available and uses simple 1-bolt clamp. Uses a single, easy-access 5mm bolt for quick and simple adjustments or saddle changes 6061 cold forged aluminum head and clamps with carbon tube
