Sonic/ERGO/39a Aerobar Shoe Covers using the same ergonomic design

using the same ergonomic design from SRAM RED

Compatible Chain: HG-EV 11-speed

so take 1 size larger than your normal shoe size

Lens functions as push-button

Sonic/ERGO/39a Aerobar Shoe Covers using the same ergonomic designThe Sonic bracket offers an extensive fit range, low weight and easy adjustment along with minimal frontal area. Combining this with the Ergo armrest creates an aerobar that will aid most riders in optimizing their position for both speed and comfort. The 39A is one of the newest versions of our reliable aluminum extension range. Performance The Sonic Ergo is designed to present minimal frontal area to create as little aerodynamic drag as possible.