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Shimano 105 36/46 to 34/50

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  • October 8, 2016 at 3:34 pm #26360
    Albec1

    Could someone confirm it’s OK and simple to switch from a 36/46 chainring to a 34/50?  Would I need to raise the front mech?  Any other considerations?

    Existing components:

    105 5800, 172.5 36/46, 11 sp, HG600 105 chain, 11-28 cassette, short cage

    Very many thanks

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Viewing 6 replies - 1 through 6 (of 6 total)
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  • October 9, 2016 at 12:47 pm #879397
    0
    Albec1
    madcarew wrote:
    As mentioned you will need to check your chain length to make sure it’s not too short to go big to big (I know you’re not supposed to do that, but if you do shift into it you stand to do damage to chain, rear mech and frame etc.) You will definitely need to raise the front mech too. It should clear the big chain ring teeth by about 2-3 mm.

    Good to know, thanks for the tip

    October 9, 2016 at 12:46 pm #879395
    0
    Albec1
    VeloUSA wrote:
    Verify your chain length. Go here for sizing calculations.

    http://www.parktool.com/blog/repair-help/chain-length-sizing#article-section-4

    Many thanks

    October 9, 2016 at 9:27 am #879393
    0
    madcarew

    As mentioned you will need to

    As mentioned you will need to check your chain length to make sure it’s not too short to go big to big (I know you’re not supposed to do that, but if you do shift into it you stand to do damage to chain, rear mech and frame etc.) You will definitely need to raise the front mech too. It should clear the big chain ring teeth by about 2-3 mm.

    October 8, 2016 at 7:03 pm #879391
    0
    VeloUSA

    Verify your chain length. Go

    Verify your chain length. Go here for sizing calculations.

    http://www.parktool.com/blog/repair-help/chain-length-sizing#article-section-4

    October 8, 2016 at 6:41 pm #879389
    0
    Albec1
    kil0ran wrote:
    That will work fine, and yes I would imagine you’ll need to raise the front mech a tad which in turn will need a cable adjustment. Probably an hour’s work tops.

    Are you after more top speed or lower gearing for climbs? If the latter you could always swap the inner chainring from 36 to 34, no mech adjustment would be required then.

    It’s optimum speed I’m after.  Thanks for your feedback, that’s good to know.  Regards,

    October 8, 2016 at 6:17 pm #879387
    0
    kil0ran

    That will work fine, and yes

    That will work fine, and yes I would imagine you’ll need to raise the front mech a tad which in turn will need a cable adjustment. Probably an hour’s work tops.

    Are you after more top speed or lower gearing for climbs? If the latter you could always swap the inner chainring from 36 to 34, no mech adjustment would be required then.

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