Seatpost Clamp Cinelli Laser Mia '13

The Cinelli Laser Mia '13 Seatpost Clamp requires a 31.8 mm clamp diameter. 

Unlike many other modern carbon fiber road frames that use oversized tubing, the premium Italian-made Laser Mia carbon frame maintains a classic, elegant silhouette. It is engineered around a traditional 27.2 mm seatpost diameter. Because of the specific Columbus carbon layup used at the top of the seat tube, the outer edge measures exactly 31.8 mm.