With the increasing prevalence of electronic controls, the permanently bonded-in ICS3 guide tubes are no longer required for proper shifting performance. Leaving them out simplifies electronic installation and saves weight.
However, since many riders still prefer mechanical shifting, we've simply engineered BBstop to accommodate all options in a single design. BBstop’s design incorporates a stop in our Single-Bend bottom bracket guide, permitting use of cable housing through the down tube. This stop prevents housing shift (fore-and-aft), fixing the axial position of the housing where it enters and exits the frame for consistent bend radii. Both ICS3 and BBstop models are simultaneously compatible with mechanical, electronic and hydraulic controls.