Zipp sl 70 aero road handlebarthe zipp sl 70 aero road handlebar is built for high performance and will satisfy even the most discerning of pro cyclists it boasts an excellent aerodynamic design stiff and strong ud carbon fibre construction and efficient internal cable routing the sl 70 aero bar also benefits from zipps computational fluid dynamics cfd which was used to design their world class firecrest wheels so with these bars you can be sure youre getting the very best technolog