BSD Aero Pro RimThe new Aero Pro rim from BSD may look like a lightweight rim but dont let its aerodynamic styling fool you. Like its big brother, the NASA rim, its design has been engineered with strength as the key feature. The Aero Pro rim has extra thick tapered sidewalls, angled spoke seats designed to accommodate proven cross over lacing and a curved inner strut. It also has two intra cavity supports further increasing the radial stiffness and axial strength.