What Our Gearhead(R) Experts Are Saying: "I've set this up on both a tri rig and a time trial build, and the fit range is unreal. The independent armrest adjustments make micro-tuning easy, and the 4525 SLC extensions feel natural whether I'm riding low and aggressive or high-hands. It's light, stiff, and incredibly adaptable for serious aero gains."When we're chasing marginal gains and refining every watt, the Supersonic Ergo+ 45 SLC Aerobar from Profile Design becomes the cockpit centerpiece. Built for triathlon and time trial precision, it gives us the freedom to fine-tune our position until power, comfort, and aerodynamics align perfectly. The Supersonic bracket uses an internal wedge clamp system for secure extension hold and streamlined adjustments, offering a massive range of independent armrest movement. With 80 armrest position options-and up to 1440 configurations when paired with risers-we can dial stack, width, and offset to match our ideal fit. The extended Ergo+ armrests add 40mm of support with textured 10mm pads for stability during long efforts. The 4525 SLC extensions feature a 45deg lower and 25deg upper section, letting us choose between a compact, low-drag setup or a high-hands aero posture. A 7. 5mm lateral shift per side refines hand width without excessive tilt, and the lightweight SLC carbon construction cuts weight nearly in half compared to previous generations while remaining Di2 compatible. For riders serious about position optimization and speed, this system delivers pro-level adjustability with race-ready stiffness.