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Thread: B-screw mods for road bike derailleurs (CX stuff)

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    Senior Member takai's Avatar
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    Default B-screw mods for road bike derailleurs (CX stuff)

    Ok, tried asking this on some road forums and they were all NFI due to it not being Durace etc

    Have Shimano 105 5700 setup on CX bike, running 1x10. Dont want to shell out for 1x11 and hydros just yet. Want bigger rear cluster. Wondering if its possible to do the B-screw mod on a 105 mech, like it is on the Shadow mechs to run larger rear clusters on 1x10 on the MTB.

    Considering this as i have a couple of spare 32T max rear clusters for the MTB, but no smaller NW chainrings spare.

    Not anywhere near the bike at the moment, so a bit hard to check. Anyone mucked around with this?

    Edit: Ugh, in wrong sub-forum. Anyone want to move it to Parts n Stuff.
    Last edited by takai; 08-10-2017 at 10:48 PM.
    --Chris

    Regarding the Hell Ride:
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    Senior Member The Duckmeister's Avatar
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    5700 got a mid-model update around 2012, which increased maximum sprocket capacity. Pre-'12 derailleurs officially have a limit of 28T, but some frames' hangers can put it a bit lower & give more clearance. 2012 model & later, post-tweak will fit a 32T out of the box. Official specs say you need the longer cage version to do it, but that's because they're assuming it'll be paired to a compact crankset with 16T chainring difference, and the total difference will push the short derailleur to its limit (but it will do it). The big cassette and tighter-range CX crankset will comfortably fit with a regular short late-model 5700 RD with no mods required.

    1x of course removes the chainring difference from the equation entirely.
    Just ride the bloody thing and enjoy yourself!

    I build wheels... :wink:

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    Not happy, Jan.
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    Quote Originally Posted by takai View Post
    Ok, tried asking this on some road forums and they were all NFI due to it not being Durace etc
    .
    Bloody roadies... I have never understood how they manage to ride with the stick so far up their arse.
    I tried to drown my sorrows in alcohol, but the bastards learnt how to swim

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    Senior Member sane's Avatar
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    If you can't do it with a huge B screw try one of these, https://www.wolftoothcomponents.com/...ducts/roadlink

    I run a 11-40t XT cassette with an Ultegra short cage 1 x 11, works a treat.

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    Senior Member takai's Avatar
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    Quote Originally Posted by sane View Post
    If you can't do it with a huge B screw try one of these, https://www.wolftoothcomponents.com/...ducts/roadlink

    I run a 11-40t XT cassette with an Ultegra short cage 1 x 11, works a treat.
    Thanks, found this https://www.amazon.com/Bicycle-Derai...words=roadlink

    Appears to be the same thing, just unbranded.

    Also looking around it appears that i can use a 9sp MTB mech, as it has the same actuation ratio as the 10sp road shifters
    --Chris

    Regarding the Hell Ride:
    You have to feel sorry for them, its a hard life, change leader, change leader, run red light, change leader, change leader, murder a pedestrian, change leader....
    --floody

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    Senior Member mtb101's Avatar
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    Quote Originally Posted by takai View Post
    Thanks, found this https://www.amazon.com/Bicycle-Derai...words=roadlink

    Appears to be the same thing, just unbranded.

    Also looking around it appears that i can use a 9sp MTB mech, as it has the same actuation ratio as the 10sp road shifters
    probably wont ship to au, get the wolf tooth from mtbdirect, I've just put on a 11-42 x2 on friends cx works nicely no more whinging on the climbs.
    pass the vides on and take it easy just flow baby just flow - definition of sound

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    Senior Member takai's Avatar
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    Quote Originally Posted by mtb101 View Post
    probably wont ship to au, get the wolf tooth from mtbdirect, I've just put on a 11-42 x2 on friends cx works nicely no more whinging on the climbs.
    Ah, thats what i have a US dropbox for ;)

    Ill pick that up, but also have a play around with a XT M770 i have lying around. See if i can get a 11-36 on there. Its primarily for a lower gear so i can turn up to work somewhat less sweaty (new work is at the top of a climb), so a 36T should be enough..
    --Chris

    Regarding the Hell Ride:
    You have to feel sorry for them, its a hard life, change leader, change leader, run red light, change leader, change leader, murder a pedestrian, change leader....
    --floody

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    Isn't the chainring easier to do?

    I run a 5700 Rd with 11-32 no mods.

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    Senior Member takai's Avatar
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    Quote Originally Posted by Calvin27 View Post
    Isn't the chainring easier to do?

    I run a 5700 Rd with 11-32 no mods.
    Easier != cheaper. Also more chain wrap at the front makes for more reliable NW.
    --Chris

    Regarding the Hell Ride:
    You have to feel sorry for them, its a hard life, change leader, change leader, run red light, change leader, change leader, murder a pedestrian, change leader....
    --floody

  10. #10
    Senior Member takai's Avatar
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    Right, 9sp rear mech and 10sp cluster works a treat:
    --Chris

    Regarding the Hell Ride:
    You have to feel sorry for them, its a hard life, change leader, change leader, run red light, change leader, change leader, murder a pedestrian, change leader....
    --floody

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