AeroCoach tilt block adapters are CNC machined devices to increase the angle of BOTH the arm rests and aerobar extensions. They also function as a converter to allow the use of AeroCoach extension clamps on some base bars (for example allowing you to use standard 22.2mm extensions on a Pro Missile Evo handlebar). The tilt block adapters give a 15deg, 20deg or 25deg angle for the arm rests and extensions. Ascalon extensions can be attached to the top of a tilt block adapter, making them compatible with a range of AeroCoach components. For riders competing under UCI regulations, please check that the angle selected will allow you to remain within UCI measurement constraints for your own setup.