Profile Design Sonic Ergo 39a BX Apparel RD Protection Function returns the

RD Protection Function returns the derailleur to its original position after an impact

Smart Valve: Automatic opening and closure

Leaves a non-sticky

Note: the chainring 1X (1-speed

school or your everyday routine provides perfect fit and aside from superior comfort offers a whole lot of functionality

Profile Design Sonic Ergo 39a BX Apparel RD Protection Function returns theThe 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 optimising their position for both speed and comfort. The 39A is one of the newest versions of our reliable aluminium extension range. Specifications Bracket: SonicClamp Diameter: 31. 8mm (26. 0 w Shims)Armrest: Ergo 10mm PadsArmrest Width: 124mm to 290mm