Aero BTA system spacer kitThis is a spacer kit that is compatible with our BTA mount plates, our Aero Cockpit and our Custom Mono Armrest. If you have previously purchased one of our other BTA systems, this will mount on the same base and replace your other spacers. Engineered to cut drag where it countsThis upgraded Between BehindTheArms (BTA) system positions your bottle exactly where it mattersjust behind the elbows or tucked close to the chestdelivering up to 10 W of