xt 11-42 cassette for free…

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  • xt 11-42 cassette for free…
  • torquil
    Member

    Firstly, if you’re not either a 1x fan, or a lover of homebrew/diy/ghetto mechanics I’d look away now. Nothing about this solution is elegant or finely crafted, how ever it took about an hour of tinkering and cost me nothing so why not…

    step one – take an old 42t chain ring and an old sprocket of the right size to line up with the chainring bolt holes
    step two – drill 2 holes 10mm in the sprocket and grind the teeth off.
    step three – bolt them together with chain ring bolts
    step four – add it to your 11-36t cassette, removing the 17t ring (as with the one-up version)
    step five – add a link to the chain
    step six – turn your B- screw right out
    step seven – go ride

    ok it took a bit of grinding and tweaking to get the spacing right (just grinding the chainring and trying it, then repeating till it was right) the old sprocket was a 32t from some random old cassette left in my junk box, the rest was XT

    so far it seems to work with no problems, but only on a quick ride, shifting is fine (with a Zee FR short mech). To be honest it seems too easy so I’m sure something won’t work long term but I’ll see how it goes.

    Premier Icon cp
    Subscriber

    this needs pics!

    jekkyl
    Member

    Not sure it’s free if you’re using a new cassette! & you wouldn’t condone using a worn cassette would you? Skiptastic!

    Premier Icon thepurist
    Subscriber

    needs more spoons

    Good effort, I’d be packing my chain whip and cassette tool on my next ride tho!

    shermer75
    Member

    As you’re bolting the chain ring to the side of a sprocket does it make the chain ring offset?

    clubber
    Member

    I’d thought about this. The biggest issue I could see was getting the chainring bolt holes accurately drilled in the sprocket. If they’re out, you’d effectively have variable gearing through the revolutions – like an oval chainring (in that it’s not constant).

    Also, the spacing would need to be right which by default it wouldn’t be because it’d be offset.

    Pics though, please!

    Seems like oliverracing has gotten a new account name on stw and bodged some cassettes together!

    Pics definately needed, sounds good though

    edit: Clubber, it would be quite easy with a 3 axis cnc to get the spacing correct in the old sprocket to remove the eccentricity but that also means you have to have access to one.

    Premier Icon paladin
    Subscriber

    ….or machine down old sprocket, machine out chainring so it fits over sprocket and weld together 😀

    clubber
    Member

    Well, yes of course it would be but I expect that’s not the norm 🙂

    Premier Icon everyone
    Subscriber

    OP we need pictures of this amazing bodge.

    irelanst
    Member

    it would be quite easy with a 3 axis cnc to get the spacing correct in the old sprocket to remove the eccentricity but that also means you have to have access to one

    If you had a CNC mill you may as well make a 42t sprocket from scratch.

    Premier Icon cookeaa
    Subscriber

    Come on OP, lets see some pictures…

    I like the idea, would be interested in the execution… a Rummage in the spares box might be in order…

    Thinking about it OP, what size sprocket if you canibalise? it’ got to be at least a 32t to have enough material to drill/bolt into? (~129mm dia’ to accommodate a 104 BCD ring?)

    Thinking about it further there must be a way directly attach a 104 BCD adapter/spider to the alloy carrier on an XT (or similar) cassette and then just space it off and remove the 17t…

    see what I mean?

    clubber
    Member

    I’m reckoning on a cassette splined 104 bcd spider. Job done and no machining of teeth required (and 42t chainrings are easy enough to get hold of.

    BearBack
    Member

    Wouldn’t the chainring need to be ramped on the other side?

    Premier Icon dadbike
    Subscriber

    I’m reckoning on a cassette splined 104 bcd spider. Job done and no machining of teeth required (and 42t chainrings are easy enough to get hold of.

    Someone has had a go at this http://www.ruedasalacarta.blogspot.com.es/2013/08/xx1-y-bas-ss1.html

    torquil
    Member

    Sorry been away all day so slow on the reply.

    I’ll try and get some more pics up later, but i warn you its not pretty.

    The chainring IS offset from the sprocket its bolted to, just the offset is the same amount as the spacer that it would normally need to separate it from the next sprocket down.

    As for accurate drilling, I’m sure technically it would make a difference to have it a tiny bit off (i.e. done by eye with a hand held battery drill whist standing on it) but in the real world (i.e. the one i ride in) I have yet to notice it.

    torquil
    Member

    oh photo doesn’t work, its here

    11-42

    torquil
    Member

    before anyone asks why only two chainring bolts, well I only had two to hand so i thought I’d try it like that just to see and it seems ok…

    andyl
    Member

    make sure you have a steel freewheel if mounting it to plain sprocket not one on a spider.

    oldnick
    Member

    Superb bodging 🙂

    Premier Icon cakefacesmallblock
    Subscriber

    10 / 10 for effort and inspiration. Good work sir.

    torquil
    Member

    make sure you have a steel freewheel if mounting it to plain sprocket not one on a spider.

    I had thought of that, and I don’t, so i’ll ride it a bit and keep checking how the freewheel is wearing. That is probably the main draw back of doing it like this but I guess its a starting point just using what old bits I had lying around not an ideal, long-term solution

    tbh the whole idea of this was really a temporary set-up just to see how well the zee mech coped with 42t before investing £60 in OneUp sprocket – and just to see how it felt generally.

    Most of the time i get by fine on 11-36 (with 34t at the front) so it shouldn’t see too much use but every now and then I could do with it when things get slippy on the climbs and I need to stay sitting down.

    theflatboy
    Member

    Allow me:

    and also… 😮 😯

    torquil
    Member

    oh, i had to grind the teeth off otherwise they hit the chain when its on 36t sprocket…

    torquil
    Member

    Allow me:

    now why didn’t that work for me…thanks

    Premier Icon letmetalktomark
    Subscriber

    Love it.

    Added to the must give this a try pile 🙂

    Could you take a pic from the side of the cassette to see the spacing?

    iffoverload
    Member

    thought I would try this as well 8) 40t with a zee 😯

    my adaptor pic

    Premier Icon letmetalktomark
    Subscriber

    Ooh …. Do you have any adapters spare? Interested if you do 🙂

    iffoverload
    Member

    I only got an Alloy and a Stainless steel one made up to check it out,

    fancy a SS one?

    Any for sale? Email in profile

    Premier Icon letmetalktomark
    Subscriber

    An SS one would be great. What would you be after?

    iffoverload
    Member

    @ anyone who definately wants one.

    let me know it you want alloy or stainless steel.

    message me on PB, I’ll get some made up and stick it on my buy/sell 🙂

    be about £20 each with a couple of spacers I would say, depending on how many I get made up.

    iffoverload
    Member

    DXF here is anyone wants to get it cut themselves 🙂

    drive.google.com/file/d/0BzKf__0FNIn7dmlPYkZnZ2NqMkU/edit?usp=sharing

    put a vid up with it on a 9 speed 40-11 with a zee mech to check it out

    wolfenstein
    Member

    Hats off to you sir 🙂

    Premier Icon AlexSimon
    Subscriber

    Yep – nice hacking.

    Edit: That’s a clutch 10sp Zee – so are you using a SRAM shifter?

    Premier Icon IamSam
    Subscriber

    Really like your solution, very very neat.

    you must have thought about doing a run of these right?? i’d definitely take one even as a test i’d pay for it as well.

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