Key Features:This bar is perfect for riders who wish to achieve lower positions that are possible with standard aero bar designs,Unlike other low stack bars, it allows fine-tuning of the stack height so the rider is not limited to only one armpad height,With the Race, armrests fitted it is tailored towards riders who intend to be low and narrow to punch the smallest possible hole through the wind,The Subsonic/Race has been designed to achieve a lower stack height than standard aero bars, without the added frontal area of a below the base bar extension clamping system,The 35a extension offers a comfortable 35-degree angle with an 80mm rise,Use one of our aero bar riser kits to increase the stack without changing the relationship between the armrest and the grips - a popular athlete request,The Race armrest has been designed to tightly cup the rider\'s arms closely, facilitating a narrow position and increasing control at speed,The extension rotation can be easily adjusted using the shaft bolt,There is a 40mm range of extension length adjustment once the extensions have been cut,There are 80 distinct position options achievable just by moving the armrests,Combine that with the risers and this bar offers 1200 possible configurations,As a clip on bar, it is also possible to adjust the extension width and tilt easily - this is the most adjustable low stack clip-on on the market,Armrest offset: -85mm to -17.5mm in 7.5mm steps,Armrest Width: 142mm to 272mm in 18.5mm steps (with Extensions at 100mm),Armrest Stack: The minimum is 40mm and the bracket is compatible with our existing risers which add up to 70mm of stack in 5mm increments,Extension length 350 mm,Weight 638 grams.