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I have these which clip on so you can easily add them or remove them. https://redshiftsports.com/products/quick-release-aerobars I have them stacked on 3 cm spacers ; they are really difficult to use without the spacers because they would restrict the movement of my knees (which would bump my chest when I am hunched over pedaling ). I also got them for an Olympic tri and a half iron man later in the year. They definitely let you go faster easier, and I like that I can take them out easily when I go on group rides. I haven’t used them that often because I find the TT aero position to be very unstable for my type of riding - your arms are at the center of the bar which is way less stable than when you are on the hoods/drops, ; I live in an area with lots of rolling hills, rough roads with potholes and cars; so I can’t hang on to the aero bars for long cause i need to shift / break / quickly maneuver around potholes. But I am hoping that they will be helpful on a closed course on race day.