105 STI Levers Double Ergonomically designed 10-speed 105 Dual Control Levers Shift cables are routed under the bar tape: re-development & positioning of the internal mechanism provides a faster, lighter & smoother shift. Ergonomic shift arc follows natural hand movement with inward shift stroke distance reduced for rapid & precise gear changes Brake lever pivots have been positioned to increase power & improve ergonomics when riding on the hoods