Based on cutting edge aero research and feedback from leading fitters zipp completely redesigned the vukabull carbon base bar with a slightly concave nose section and forward swept arms the new airfoil shape reduces drag stiffens the bar and complies with all uci regulations meanwhile a host of ergonomic features have been added most notably the vukabull is now available with a choice of zero or 40mm drop the clamp area now provides an extra 10mm of lateral adjustment for clip on aero