Changing rear cassette ratio

Hi everyone, I'm hoping you'll be able to help. I have a 3x9 Shimano 105 groupset with a rear cassette ratio of 13/25 (circa 2005, I think 5500.) I would really like to change my cassette ratio to possibly 11/30 or 11/32. But after some searching it looks like my rear derailleur will only allow 11/27? I can get a 11/28?

If I turn my limit screw fully in will that be enough for the 28 teeth? There was mention of a longer b-screw?

Thanks in advance.


  • pblakeney
    pblakeney Posts: 25,277

    In my experience you can add one or two teeth so the 28 should be okay but I've not used that groupset.

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  • You would need to get feedback from others about compatibility, but just a thought...

    My '20 Voodoo Marasa hybrid is 3*9, 12-36 cassette with I think 26-36-48 triple chainring, using an Altus GS(?) rear derailleur.

    2020 Voodoo Marasa
    2017 Cube Attain GTC Pro Disc 2016
    2016 Voodoo Wazoo
  • Thanks for the advice, I'm going to try the 11/28 🤞 it works.