Internal cable routing keeps cockpits clean, but it also means small plastic bits that guide your hoses and wires through the frame. The CBG-DT-ASP is the downtube port guide for the Aspero and Caledonia platforms, managing the transition point where Di2 wiring and hydraulic brake hose enter the frame from the handlebars. If yours cracked during a cable swap, got lost during a build, or simply went missing somewhere between the shop floor and the parts bin, this is the replacement.

The two-piece composite design makes installation straightforward even with cables already routed. The main guide body clips into the downtube port and provides the channel that keeps hoses and wires from rattling against the inside of the frame. Once you've threaded everything through, the cover piece snaps over the top to seal the opening and give the frame a finished appearance. That cover is doing more than cosmetic work—it also prevents water and road grit from migrating into the frame interior through the cable entry point.

This guide handles both hydraulic brake hose and Di2 electronic wiring simultaneously, which is the standard configuration for Shimano hydraulic disc brake groupsets with electronic shifting. The port sizing accommodates the hose diameter without pinching, and the smooth interior surfaces reduce the chance of wear on the hose outer jacket over time. If you're building up a frameset or doing a full groupset swap, install the main guide body first, route your hoses and wires, then snap the cover into place as a final step.... Read More