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  • Help needed buying new chainring (Shimano 105)
  • edenvalleyboy
    Free Member

    CX bike has Shimano 105 on a 110BDC 4 arm setup.

    I want to swap out inner chainring for 34t (from 36t).

    Some websites suggest have to buy a 105 specifc ring?

    Do I? Or what are the alternatives?

    Cheers for any help.

    simondbarnes
    Full Member
    therevokid
    Free Member

    36t down to a 34t should be OK. I found going the other way
    Was prone to not shifting at the front if I was toward the 11
    End of the cassette.

    The back of the big ring has a ramp that finished where the inner
    Teeth start so putting the 36t on meant the downshift didn’t work
    And the chain ended up sitting between the 2 but not jammed !!!

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