It really depends on the condition of your old cables/casings rather than the switch to 10s. If you have doubts, replace the cables/casings. Otherwise, no need.russotto said:When going from 9 speed to 10 speed Shimano, is it necessary or advisable to change the shifter cables?
That's why I don't use the crimps. I finish the ends of my cables with a drop of thick CA glue.yanksphan said:Trying to thread a used, crimped cable through the shifter and housings can be one of the more maddening experiences of wrenching. Those little cable strands under the fingernails feel great!
Replace them. Takes the same amount of time (most likely less time) and costs just a couple bucks.