Tiagra/Ultegra 10 speed compatibility

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  • Tiagra/Ultegra 10 speed compatibility
  • Premier Icon meandyuk
    Subscriber

    Hi, looking for help on a potential bodge 🙂

    I have a Tiagra 4700  short cage rear derailleur – currently running an 11-28 cassette. I’m looking to go for a more spinny gear but i’m not sure if either of these cassettes will work ok? or if I would need a new rear mech.

    – Shimano Tiagra 11-32 HG500
    – Shimano Ultegra 12-30 6700

    The bike it’s going on is a Trek Emonda ALR 2016 with a compact 50/34 chainset

    Cheers
    Andy

    taxi25
    Member

    Both would be fine 👍I think you can go to 34 with that mech.

    Premier Icon cp
    Subscriber

    It won’t work with your current short cage mech – you’d need the longer mech.

    See specs for details.

    Short

    https://bike.shimano.com/en-EU/product/component/tiagra-4700/RD-4700-SS.html

    Long

    https://bike.shimano.com/en-EU/product/component/tiagra-4700/RD-4700-GS.html

    taxi25
    Member

    It won’t work with your current short cage mech – you’d need the longer mech.

    Shimano do say that, but real world experiences say different. Have a google OP, certainly a 32t should be fine with a B screw adjustment.

    Premier Icon meandyuk
    Subscriber

    Ok thanks, I’ll have a google. Thinking the ultegra might be a good option as a slight upgrade in terms of weight too.

    Thanks

    stumpy_m4
    Member

    I run a 105 short cage mech on the gravel bike and a 32T is maxed out with the b screw right in , Cant see it working on a 34T

    blader1611
    Member

    Meandyuk – i have a brand new 4700 medium cage derailleur you can have for £15 posted if that helps, it runs 34t no probs. I had a short cage and trying to get it to work with a 32t was very problematic and frankly not worth the hassle.

    Premier Icon meandyuk
    Subscriber

    Thanks, i’ll keep it in mind.Currently thinking I’ll go for the 30t so hoping this will be less troublesome than a 32t with the short cage rm

    blader1611
    Member

    I think a 30t will be ok with the short cage, probably the cheapest option too.

    jonnyboi
    Member

    short cage will ‘probably’ work on the 32Tbut it depends on your hanger and how much b screw you have to play with.

    plus depending on the front rings you use it could be pretty damn tight if not locked in big/big. I’ve seen a short cage mech work with an 11-32 cassette with 34t chainring but not be able to cope with big/big on a 46T outer.

    TBH I would just buy a mid cage mech

    Premier Icon tillydog
    Subscriber

    I’m looking to go for a more spinny gear

    The 30 tooth cassette will only give you “half a gear” more – will that qualify as ‘more spinny’?

    The 11-32 Tiagra cassette will give “one gear” more, but has an annoying (to me*) gap at road speeds as it doesn’t have a 13T sprocket (it goes 11 – 12 – 14).

    Have a play

    *I replaced the 11T & 12T with new 12T & 13T sprockets to give me 12-13-14 and don’t miss the 11T ever (50/34 chainrings).

    If you go with ultegra you will need the 11 speed version. Tiagra 4700 series is the same pull ratio as the other 11 speed shimano stuff even though it’s 10 speed.

    If you go with ultegra you will need the 11 speed version. Tiagra 4700 series is the same pull ratio as the other 11 speed shimano stuff even though it’s 10 speed.

    The OP is swapping cassettes, not mechs.

    Premier Icon sockpuppet
    Subscriber

    Pretty sure 4700 has different spacing than all the other groups, and all other tiagra.

    Premier Icon meandyuk
    Subscriber

    Now i’m a little confused – will the Ultegra 10speed 12-30 cassette not work with a 4700 rear mech then?

    I know its not a long more ‘spinny’ but I think it may make a bit of a difference here in Yorkshire… plus I need a cassette for the turbo so may as well chuck the older cassette on that and use the better one for going outside with.

    Cheers.

    Premier Icon ransos
    Subscriber

    Now i’m a little confused – will the Ultegra 10speed 12-30 cassette not work with a 4700 rear mech then?

    It should be fine – I’m pretty sure that the cog spacing on new Tiagra 10 speed is the same as older Ultegra/ 105 10 speed.

    Premier Icon meandyuk
    Subscriber
    toemul
    Member

    Ive got tiagra without looking it up there are some shifting diffences with other 10 speeds so be ware y about mixing with 6700 without more information.as others have already said.

    Premier Icon tillydog
    Subscriber

    will the Ultegra 10speed 12-30 cassette not work with a 4700 rear mech then?

    +1 should be fine – the pull ratio of the rear mech is same as 11 speed, but cassettes are normal 10 speed.

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