SDG I-Beam Unidirectional Carbon Micro-Adjust Seatpost 0mm Setback 30.9x400mm

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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