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  1. #1
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    3/32 chain and sprocket...what sprocket count?

    I've got a Nuvinci 360 hub that came without a sprocket.

    The manual specs a 3/32 chain and standard 9 spline 3/32 sprocket.

    My question, I'm trying to find 3/32 chain and sprocket...and everyone is clueless at the bike shops. They just keep asking me "how many speeds it is". I'd assume a higher rear cog count (9, 10, 11) would need a thinner chain. So at what rear cog count would it be 3/32 chain vs 1/8 chain? I'm assuming 10spd?

    Looking forward to advice!

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    Why don't you ask this in the Mechanics Forum?

    If you click on the little exclamation point in the lower left and report your thread to a mod they'll even move it for you...
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    Here we go.
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    All 3/32" chains are the same inside width and run on the same sprockets. Chains for more speeds are thinner on the outside by virtue of thinner plates and tighter clearances.

    Since being narrower is useless to you, you might as well save dough with a wider 6s chain. Also wider chains last longer giving you another reason to go wider. If you find a nice 7s chain that would be about equally fine, but going any narrower will cost you more dough for shorter chain life.
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    Thanks FBinNY

    Here is what their manual says...

    Due to tight clearances at the N360 Hub Interface, the NuVinci N360 is incompatible with 1/8 inch (3.18mm) single-speed chains. Use only 3/32 inch (2.3mm) chains and sprockets.

    So any 6s sprocket and chain will be 3/32 then, correct? The higher count (7, 8 and 10 spd) chains are only different that they are narrower OD, but same ID. A 6, 7, 8 or 10spd sprocket would still have the correct pitch for a 3/32 chain, only outer thickness would prevent one chain working with the other.

    I think this is starting to make sense. Please verify if I'm correct with the above statement...
    Last edited by unclejemima; 04-07-14 at 07:32 PM.

  6. #6
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    Quote Originally Posted by unclejemima View Post
    Due to tight clearances at the N360 Hub Interface, the NuVinci N360 is incompatible with 1/8 inch (3.18mm) single-speed chains. Use only 3/32 inch (2.3mm) chains and sprockets.

    So, in english, what exactly is normal 3/32 inch chain and sprocket? The guys at the bike store have no clue, nor do I. Would the 6s chain be 1/8" still...and the 7spd be 3/32?
    All derailleur chains ever since 5s speed (5x2 10 speeds) back in the sixties are 3/32" chains. Some 11s chains are now being called 11/128" because the inside width is a bit tight for the 3/32" definition.

    If you're at all uncomfortable, use a 7s chain, because these have flush links and are narrower than 6s. Above 7s the incremental changes in outside width are small and I very strongly doubt matter to your hub, because otherwise NeVinci would have been very clear to say use a 8s (or more) chain, rather than the generic 3/32" class.

    Anyway, scroll down to the width chart here so you can sleep better

    BTW- the guys in the bike shops are being jerks, feigning ignorance on a simple issue. It might be because they don't want to be involved with your NuVinci hub.
    Last edited by FBinNY; 04-07-14 at 07:35 PM.
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    And to verify the sprocket thing, here is what their manual says about sprockets...
    the sprocket must be a standard 9-spline 3/32 inch (2.3mm) sprocket.

    I'm assuming any multi-tooth rear cog-set would use 9-spline inner...?

    Let me know,

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    Quote Originally Posted by unclejemima View Post
    And to verify the sprocket thing, here is what their manual says about sprockets...
    the sprocket must be a standard 9-spline 3/32 inch (2.3mm) sprocket.

    I'm assuming any multi-tooth rear cog-set would use 9-spline inner...?

    Let me know,
    You need to buy sprockets made for Shimano 8s or 9s systems. see the difference here.

    They can come from anybody, as long as they're made for Shimano 8s. Sram and many other non Shimano sprockets use the same spline Campagnolo, doesn't.

    BTW- people throw away cassettes when smaller sprockets wear out. In many cases the middle and larger sprockets are fine. If you know what size you want and ask, someone here might give you a slightly used sprocket for the cost of postage and a beer.
    Last edited by FBinNY; 04-07-14 at 07:51 PM.
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    Ok. So a 10speed sprocket is out of the question? (I have a 10spd cassette that I can dismantle.)

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    Quote Originally Posted by unclejemima View Post
    Ok. So a 10speed sprocket is out of the question? (I have a 10spd cassette that I can dismantle.)
    Try it on the hub and if it fits, your in, if not, you're out.
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  11. #11
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    Quote Originally Posted by FBinNY View Post
    Try it on the hub and if it fits, your in, if not, you're out.
    Got it. Thanks!

    But any multi speed chain would be 3/32", correct? (as opposed to single speed chain)

  12. #12
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    Quote Originally Posted by unclejemima View Post
    Got it. Thanks!

    But any multi speed chain would be 3/32", correct? (as opposed to single speed chain)
    how many time and how many ways do I need to say it?

    Yes, yes, 1,000 times, yes.
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  13. #13
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    Quote Originally Posted by FBinNY View Post
    how many time and how many ways do I need to say it?

    Yes, yes, 1,000 times, yes.
    Relax.

    Just trying to make sure I understand this because for the last few weeks, every bike shop I've been to has made this into a royal gong show. I went in and simply asked for a 3/32 sprocket and chain and not a single person knew what I was talking about. Its like I was trying to buy golden leprechaun poop.

    Had you been at the store to sell it to me I would not be here posting 2 weeks later trying to find the right parts!

  14. #14
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    Quote Originally Posted by unclejemima View Post
    Relax.

    Just trying to make sure I understand this because for the last few weeks, every bike shop I've been to has made this into a royal gong show. I went in and simply asked for a 3/32 sprocket ....
    FYI- it it does use Shimano pattern cassette sprockets, these aren't generally sold loose. You might have to buy a complete cassette just for one sprocket, or as I said earlier, scrounge a used one.

    OTOH, if you do buy a cassette and use only one sprocket, especially a larger one, you might recoup some cost by selling the rest to someone who only needs the smaller ones.
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  15. #15
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    Quote Originally Posted by FBinNY View Post
    FYI- it it does use Shimano pattern cassette sprockets, these aren't generally sold loose. You might have to buy a complete cassette just for one sprocket, or as I said earlier, scrounge a used one.

    OTOH, if you do buy a cassette and use only one sprocket, especially a larger one, you might recoup some cost by selling the rest to someone who only needs the smaller ones.
    Thanks.

    I tried the 10spd gears and they do fit...but I have 2 problems. The fit is a bit loose, but it does fit. The second problem is, the gears I need (20T or so) are riveted together. Can I just drill the rivets out and use it that way?

    Can you think of any cog sets that would not be riveted together? I think SRAM uses a different inner spline design...so that would not work.

    Here is a photo of what the correct single sprocket looks like on ebay...only for some odd reason, it does not have the small "tooth" that the the shimano 9spline design has.

    $_57.JPG

  16. #16
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    I think I've earned a consulting fee.

    You can't take the sprocket off the spider, since then it won't have the right spline. (duh!).

    You might use a sprocket off a loose cog Sram cassette, but you really don't want to. Cassette sprockets are designed to work in cassettes and have things like teeth shaped to ease shifting. What you really want is a sprocket made for single speed use, like these here. This is a UK source, but I'm sure that with a few minutes of effort you could find similar ones at a reasonable price within the US.
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  17. #17
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    Is there a reason why you can't just buy a 3/32 single speed cog and avoid buying a whole cassette to just to take it apart?
    Dimension Splined Singlespeed Cog > Components > Drivetrain > Singlespeed Cogs and Freewheels | Jenson USA Online Bike Shop

  18. #18
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    Quote Originally Posted by unclejemima View Post
    Here is a photo of what the correct single sprocket looks like on ebay...only for some odd reason, it does not have the small "tooth" that the the shimano 9spline design has.

    $_57.JPG
    The small spline is only to keep multiple cogs with shifting ramps oriented for smother gear changes. It unnecessary for a single cog.

  19. #19
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    Quote Originally Posted by unclejemima View Post
    I tried the 10spd gears and they do fit...but I have 2 problems. The fit is a bit loose, but it does fit. The second problem is, the gears I need (20T or so) are riveted together. Can I just drill the rivets out and use it that way?

    Can you think of any cog sets that would not be riveted together? I think SRAM uses a different inner spline design...so that would not work.

    Here is a photo of what the correct single sprocket looks like on ebay...only for some odd reason, it does not have the small "tooth" that the the shimano 9spline design has.

    $_57.JPG
    At the risk of duplication I'll chime in too. 10-speed cogs are thinner than 7,8 or 9-speed cogs since they have to fit 10 cogs in the same overall cassette width as 8 or 9 cogs so that may be why they are loose on your hub. Find a 7 or 8-speed cog if you can.

    Shimano's 7 and 8-speed cassettes, particularly 105 and below, use "full plate" cogs throughout so you can remove the bolts or rivets holding the stack together and use them as individual cogs.

    A single speed cog is the cheapest way to get what you need other than a free used cassette. Bazelel is correct, the keyed tooth in multispeed cassettes is there to orient the cogs relative to each other to improve shifting. That's a nonissue with a single cog and, in fact, a single speed cog is better for that use since it has no shifting aids.

  20. #20
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    Thanks guys.

    Yes, ultimately I need just a 3/32 singe speed sprocket...but they are not available in my area. I'm just going to order one a call it a day.

    Thanks for your help.

  21. #21
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    What tooth count will work for you to get the drive ratio you want?

    9 spline is a type, now ... Shimano BMX .. Sturmey Archer S3X uses those ..SRF5 and Brompton 2 & 6 speed, and so forth ..
    full height teeth wont ghost shift like derailleur cogs are prone to do ..


    3/32" is the thickness ..1/2" is the pitch .. often used for IGH... that extra 32nd matters On that hub , apparently ..

    in front I really like Surly's stainless steel chainrings, also old school tooth profiles with tall teeth

    flat cogs can also be flipped doubling the wear miles ..
    Last edited by fietsbob; 04-08-14 at 11:55 AM.

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