Viewing 17 posts - 1 through 17 (of 17 total)
  • Gearing question.
  • duckman
    Full Member

    Morning, so I currently have a 48/36 Ultegra chainset and a 11-32 cassette on a Ultegra medium cage rear mech. Is there any reason why I can’t fit a 48/31 GRX chainset to give me more chance of getting up stinking steep hills? Thanks, Stuart.

    bikerevivesheffield
    Full Member

    What front mech? Check Shimano.si for tech Doc’s etc

    scotroutes
    Full Member

    GRX chainline is slightly different to Ultegra so your front mech might struggle.

    Another option would be a wider-range cassette. An Ultegra rear mech will handle it, despite what Shimano document.

    slowoldman
    Full Member

    Another option would be a wider-range cassette.

    I believe the Ultegra will handle up to 40T perfectly well with a roadlink. As for the front end, instead of a whole new crankset how about some Absolute Black 46/30 oval chainrings? 30×40 sounds like my kind of gearing!

    scotroutes
    Full Member

    I believe the Ultra will handle up to 40T perfectly well with a roadlink.

    I have 50/34 and 11-40 without a Roadlink. Can’t guarantee that’ll work on all frames though.

    n0b0dy0ftheg0at
    Free Member

    Have a play with different ring sizes and cassette options in a gear inch calculator such as https://www.sheldonbrown.com/gear-calc.html

    New inner ring and 11-34 cassette would set you back ~£80 going on Merlin prices.

    https://www.probikekit.co.uk/bicycle-cranksets-and-chainrings/shimano-grx-rx600-double-11-speed-chainset/12649530.html isn’t a bad price for a 30/46 chainset, if you don’t mind 175mm cranks.

    jamesco
    Full Member

    I have 50/34 and 11-40 without a Roadlink. Can’t guarantee that’ll work on all frames though

    This is the way to go if you’re happy to experiment.

    breninbeener
    Free Member

    What 40t rear cassette are people using with the ultegra rear mech?

    duckman
    Full Member

    As ever, thanks everybody.

    scotroutes
    Full Member

    Ian, XT 11-40 on mine.

    jamesco
    Full Member

    Ian, Sunrace on mine

    jamesco
    Full Member

    Although TBF I switched one mech to 105.

    breninbeener
    Free Member

    Thanks all. So a mtb cassette will just work fine on 11sp ultegra with a road rear mech? (Obviously within limit of chain capacity of cage). Has this always been the case? I thought Shimano cassettes were mtb or road…..

    Ian

    scotroutes
    Full Member

    That’s what I’m using on the Amazon.

    105 5800 shifters

    105 5800 50/34 chainset

    105 5800 front mech

    Ultegra RX800 rear mech (I wanted RX for the clutch as I take the Amazon off-road most of the time)

    XT M8000 11-40T cassette.

    The only “non-standard” thing I’ve had to do is extend the 116 link chain by two links. I can fully cross-chain.

    If I remember correctly, depending on your hub, you may need a 1mm spacer behind the cassette.

    jamesco
    Full Member

    Not only that, Deore 591 9speed derailleur is a great cheap alternative if you’re struggling to wind up the extra chain, it works with 10 and 11 speed, not sure about 12sp though.

    breninbeener
    Free Member

    Guys, thats awesome. Thanks!

    Ian

Viewing 17 posts - 1 through 17 (of 17 total)

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