This 31.8mm seat post shim adaptor sleeve is for converting 31. 6mm seatposts to to fit inside 34.9mm seat post tubes. It can be used to convert dropper posts, suspension seat posts or regular seatposts. Seatpost Shim 31.8 mm to 34.9 mm Specifications Brand: Adspopts. Material: Painted alloy. Length: 59 mm. Weight: 24.5 grams Size: 31.8 - 34.9 mm. Part number: SPA318-349.
