Shimano 105 RD Short Cage Capacity

stringybob Posts: 64
edited October 2014 in Workshop

I am looking to change my current 11-25 cassette to a more hill-friendly Ultegra 12-30. Would my existing short cage rear derailleur be able to cope?


  • Yes, your chain will be too short though.
  • arlowood
    arlowood Posts: 2,561
    I've done it on a couple of set-ups using the SS read derailleur, compact chainset and a Tiagra 12-30 cassette.

    Should be no problem assuming as Arthur suggests you get the chain length correct.

    You may have to adjust the B-screw a bit to make sure there is enough clearance between the top jockey wheel and the larger sprockets when they are in use.