ADAPTOR TIJA SA ACID SEATPOST 27.2 / 31.6 mm Whether your seatpost is narrower than your seat tube, or you've deliberately gone for a smaller diameter seatpost to benefit from the added flex and comfort they offer, our anodised aluminium seatpost adapter adapts the inner diameter of your seat tube to match the outer diameter of your seatpost. Important: the adapter comes in three different sizes, so be sure to measure first!Anodized seatpost adapter Adapts the inner diameter of your seattube to match the outer diameter of your seatpost Available in three sizes