Designed to cut weight and improve performance, the tharsis dropper seatpost features 100mm of infinite-stop travel, internal cable routing and is available in three diameters; 27.2, 30.9 and 31.6mmthe 27.2mm version boasts a 3d forged construction with an al6061 alloy lower and an al7050 alloy shaft, with titanium bolts; which ensures that it tips the scales at just 405gthe 30.9 and 31.6mm versions also pack a 3d forged construction; but with al7075 lowers and an al7050 shaftthe new 2-bolt saddle clamp saves 45 while the oval shaft, improved collar design and optimized lower tube saves a further 25gavailable in 27.2, 30.9 and 31.6mmweight: from 417guniversal (prsac0212) or lh (prsac0211) lever sold separately