The cable guides we use are completely custom, designed by Noel, because none of the off the shelf options were acceptable. Our system allows any number of combinations for routing(including di2) and it is designed to compress the rubber insert which keeps tension on the housings which eliminates cable housing rattle...

Noel made sure that our head tube length was optimized (like it is for all our bikes) to make sure the handling is classic Knolly. He also optimized the sweep of the down-tube and top-tube to accommodate a full size water bottle...