The Hypersonic bracket offers our new generation ´¼üt range in a low stack, undermount formatThe Hypersonic style bar has been part of our range for over 20 years and remains popular among riders who want an easily adjustable bar with low stack,The Hypersonic is our most ergonomic design in this style to date,Pairing this bracket with the ergo armrest offers industry leading ´¼üt options and greater comfort,With the 50a extensions this aerobar encourages a neutral wrist angle,The Hypersonic/Ergo platform is designed to give riders a low stack bar with easy adjustability of extension length and rotation,There are 80 distinct position options achievable just by moving the armrests,Fit information: Armrest Offset -85mm to -17.5mm in 7.5mm steps, Armrest Width 112mm to 280mm in 18.5mm steps, Armrest Stack 39mm,Weight: 640g.