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change Shimano R8050 11-30 rear cassette for an 11-34

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  • April 20, 2020 at 2:58 pm #30644
    Esprits1

    Hi
    I recently bought a Ridley Noah Fast Disc with Shimano Di2 and was wandering can I swap the rear cassette which is an 11-30 for an 11-34. Is this a straight swap or will I need to change anything on the bike.

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Viewing 8 replies - 1 through 8 (of 8 total)
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  • April 21, 2020 at 8:56 am #957899
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    fukawitribe

    Shimano are notoriously

    Shimano are notoriously pessimistic about things like this, perhaps understandably, but given the R8000 GS will pull an 11-40 i’d be tempted to try your SS with the 11-34 first . Wind that B-tension screw in, or reverse it, and see what clearance you get on the top jockey – i’d hazard a guess that the chain wrap on the SS is OK if it’ll work perfectly on an 11-30.

    April 21, 2020 at 8:04 am #957897
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    Rich_cb

    Yes.
    Yes.

    April 21, 2020 at 8:02 am #957895
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    Rich_cb

    As Chris Hayes said below
    As Chris Hayes said below just get a road link, it’s very easy to set up and much cheaper than a new Di2 derailleur.

    I’m using one with my mechanical Ultegra and it works perfectly.

    April 21, 2020 at 7:47 am #957893
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    Esprits1

    Just had a reply back from

    Just had a reply back from Ridley and my bike has the short cage rear derailleur fitted to it so i will need to change to the GS to use 11-34 rear cassette

    April 21, 2020 at 4:55 am #957891
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    Chris Hayes

    I used a Wolf Tooth ‘Roadlink

    I used a Wolf Tooth ‘Roadlink’ to extend my medium cage derailleur.  Costs about £25 and saves you a) replacing a derailleur and b) splitting your chain.  I thought that it might be a bit of a bodge, but it works very well.

    I’d been running the 32 and the chain together for a few 1000 kms, so replaced my chain anyway.  There are plenty of chain length calculators online to help you with the exact number of links you’ll need. 

    April 20, 2020 at 9:50 pm #957889
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    Esprits1

    Just to try it can I use a
    Just to try it can I use a wheel with a shimano 105 11-34

    April 20, 2020 at 4:15 pm #957887
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    mikewood

    Depends on the cage length.

    Depends on the cage length. If it’s the longer one, Yes as that’s what I have on mine! If it’s the shorter one, probably not but might be worth a try if you know someone with one already fitted on a wheel.

    April 20, 2020 at 3:32 pm #957885
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    Judge dreadful

    11-34 will ( almost certainly

    11-34 will ( almost certainly) take your drive train out side of the recommended tooth difference and capacity for that rear mech. You’ll have to get a hanger extender, and be careful about chain length. You may find it impossible to get a tension setting that allows you to use every ratio available as well.

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