Fastblack2 are full carbon extensions with a J-bend design that offer an ergonomic grip and help increase speed while pushing on the pedal. A special spacer kit allows you to increase the armrest height by up to 55mm for a more comfortable position and various heights. The extensions have adjustable armrests with pads and are customizable. Fastblack2 is available for handlebars with a diameter of 31.7 or 35.0 mm. The spacer kit is only available for the 31.7 mm handlebar version. Fastblack2 is the best and lightest solution for converting a road bike into a time trial or triathlon bike.