The 9170 shifters feature an ideal ergonomic shape that is comfortable in the hand and similar in size to mechanical braking versions of the shifter the shift paddles now also feature a more defined click for confidence in shifting and to prevent mis shifts e tube compatibility means that the shift paddles can be customised to suit the rider the 9170 shifters now include synchro shift technology that automatically moves the rear derailleur when the front ring is changed or moves the front d