Originally Posted by
e_guevara
Shimano's solution was a better cable system - lined housings and teflon coated cables. This made good/proper cable routing very important to get good shifting.
+1 Use the PTFE coated cables and SP41 housings and it should shift fine if your mechanic is halfway competent. Don't make the cable run unnecessarily long at the bars / downtube and make sure the rear RD loop is
long enough. The new polymer coated 6800/9000 cables are even better but I had a poor experience with durability and went back to the PTFE cables.