Ultralight Aluminum 7005 T6 – An aluminum alloy renowned for its high strength-to-weight ratio.Rigid Unibody Frame – A unibody frame is much stronger and requires less maintenance than a standard two-part frame. It also reduces weight while maximizing propulsion efficiency.Symmetrical Hydroformed Crossbrace 3D – Entirely symmetrical aluminum crossbrace for reduced torsion and better energy distribution throughout the frame. Ultrarigid Folding System – High-precision tolerances and oversized pivot axles for best-in-class propulsion efficiency.Forged Vertical Axleplate – Offers the industry’s most precise rear wheel adjustability. The vertical mounting maximizes rigidity and responsiveness. Evolve Caster Housing – Integrated into the frame for rock-solid durability, the Evolve Caster Housing offers easy and precise infinite adjustments. Flip-back Convertible Armrest – Easy to adjust and made of composite materials for strength and reduced weight, it is the only armrest that converts from flip-back to single post without the use of tools.Anti-Flutter System – Minimize flutter with a simple twist of a screw.Newton Accessories – Parts and accessories designed to be lighter with improved functionality and style.