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Switching between 52-36 & 50-34 chainsets – advice needed

  • This topic has 5 replies, 5 voices, and was last updated 7 years ago by Bowks.
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  • June 1, 2019 at 11:55 am #29705
    Bowks

    I’m wondering if anyone had any experience of switching chainsets over with the latest iteration of Ultegra and whether or not a front mech adjustment will be necessary. The bike currently has 52-36 but I’m doing a ride where I want lower gearing, so might swap chainrings. I’m aready running the biggest cassette possible with the rear mech. 

     

    Reason being, my weight to power ratio is better than power to weight right now!

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  • June 3, 2019 at 9:03 am #942841
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    Bowks
    BehindTheBikesheds wrote:
    you could lower the mech but frankly you won’t notice any difference if you don’t.

    When you say you’re running gthe biggest cassette for your rear mech, is that the biggest according to the manufacturer or actual real worl dbiggest?

    i.e. the Dura Ace/6800 short cage rear mechs will handle a 32T yet were designated to only handling a 28T

     

    It’s an R8000 short cage mech running with an 11-30t cassette.

    June 1, 2019 at 11:41 pm #942839
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    Anonymous

    you could lower the mech but

    you could lower the mech but frankly you won’t notice any difference if you don’t.

    When you say you’re running gthe biggest cassette for your rear mech, is that the biggest according to the manufacturer or actual real worl dbiggest?

    i.e. the Dura Ace/6800 short cage rear mechs will handle a 32T yet were designated to only handling a 28T

    June 1, 2019 at 7:36 pm #942837
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    kil0ran

    maviczap wrote:

    maviczap wrote:
    You’ll find you’ll need to drop the mech to keep the shifts crisp.

    Easy enough to do, unless it’s a braze-on and it’s already as low as it can go. Unlikely, but some race bikes won’t take a compact (Kinesis Aithein springs to mind)

    Won’t need much of a drop but you’ll probably need to detach the cable and re-tension. You might be lucky and not have to do that as the new Ultegra front-mech has a tension adjuster built in, and you may still have a barrel adjuster inline near the shifter too. Oh and you may have to move the tiny stick-on backup plate too. 

    June 1, 2019 at 6:12 pm #942835
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    Jimthebikeguy.com

    Nothing to it, but you will
    Nothing to it, but you will need to lower the front mech down the frame a short way, and also then readjust it to be thorough.

    June 1, 2019 at 2:39 pm #942833
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    maviczap

    You’ll find you’ll need to
    You’ll find you’ll need to drop the mech to keep the shifts crisp.

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