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Thread: 28t SS cog?

  1. #1
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    28t SS cog?

    Does anyone make one, with a wide base?

    I've found (and have) a 25t Endless, but haven't found anything bigger with a wide base.

    I have a loose 7 (or 8?) speed 28t cog pulled from a Shimano HG cassette, but it's narrow and ramped. Not ideal.

    This is a very specific project and the 28t cog is for a very specific (and non-negotiable) reason.

    Thanks.

  2. #2
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    I'm interested too.

    I have found an adapter from Pinion which takes a chainring, but the smallest that would fit would be 30. I use 32 because I can get steel and the intended use is for bogs and mud. I would sooner have a 26 or 28.



    Bike is a dingle speed 32/22 and 22/32.

    Pinion also do a wide base 26 tooth rear cog. https://pinion.eu/en/accessories/

    I would like an adapter that would take granny rings. They are generally steel and would allow the use of a 26 or 28 tooth.
    As little bike as possible, as silent as possible.
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  3. #3
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    I don't know of a 28 tooth SS cog. What I would do, if I had specific need of one, is get hold of a really responsive company, and ask them if they could one-off (or maybe five-off so I had some extras?) one for me. The odds are good they COULD because it's a fairly easy, straight forward, and simple part. It's a matter of WOULD they. And I guess that would depend on how cool they thought your project was, and whether they felt like they had time to make it "cost effective" for them, even if you're paying top dollar for the product. Now, if it were me, the two companies I'd try FIRST would be Wolf Tooth and Endless, with my personal bias being more optimistic that Wolf Tooth might do it. It won't be cheap I don't think, but it's likely your only option short of finding a local machine shop and having it custom made there. I expect their draftsman would be able to spec something for you easiest if you presented them with a cog that had the actual base and tooth profile you wanted.

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    Quote Originally Posted by Velobike View Post

    I have found an adapter from Pinion which takes a chainring, but the smallest that would fit would be 30.

    I would like an adapter that would take granny rings. They are generally steel and would allow the use of a 26 or 28 tooth.
    If you could find an adapter like yours with a 94/96 bcd instead of 104 it could be ideal for both of you. I don't know anyone who makes one, just a thought.

    There's got to be some sort of creative solution here? Aside from "get a custom cog made".
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  5. #5
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    Early Shimano uni glide cassettes were not ramped. You may find an individual cog or whole cassette stack on ebay with a 28 in it. It'd still be narrow, but at least not ramped.

    Edit: here's what I see at the moment but they come and go. You can flip the cogs too for more life.

    https://m.ebay.com/itm/Shimano-Deore...cAAOSwf-xZnBU5

    Uniglide was so cool. It's a shame shimano didn't keep some of the nicer features like stackable individual cogs and the tooth profile.

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    Quote Originally Posted by *OneSpeed* View Post
    If you could find an adapter like yours with a 94/96 bcd.

    I have a similar adapter in 5 bolt x 58mm. But I can't find a 28t x 58mm ring, either.

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    Some of the motorized bicycle sites make/carry some pretty large wide base rear cogs like up to 32t, probably heavier than shit though.
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    Quote Originally Posted by socal_jack View Post
    Some of the motorized bicycle sites make/carry some pretty large wide base rear cogs like up to 32t, probably heavier than shit though.

    Interesting. Have an example of a site in mind? I'm not tuned in to that world at all.

  9. #9
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    I was about to say, there had been discussion some years ago about the Spicer adapter. Of course I found your ad trying to sell yours back in 2004.

    Quote Originally Posted by mikesee View Post
    I have a similar adapter in 5 bolt x 58mm. But I can't find a 28t x 58mm ring, either.

  10. #10
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    Quote Originally Posted by mikesee View Post
    Interesting. Have an example of a site in mind? I'm not tuned in to that world at all.
    The only one I can find right now is for a nuvinci hub but this is the type of build they generally look like


    Staton Inc

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  11. #11
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    Haha, you could drill it out and loose half a pound. One of the luxury's of not having a motor on your bike.
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  12. #12
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    Drillium version needed for sure, but i've seen carrier version that was probably half pound lighter
    Last edited by socal_jack; 4 Weeks Ago at 02:19 PM.
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    Maybe you can track down the guy from Homebrew Components (his website seems to be gone) and have him make you one. Maybe someone around here knows him or how to get in touch with him. Appears that his name is Dan Wilcox, he was on this site as ISuckAtRiding but has not been active since 2012. I get the feeling it may be another of those stories where the one man shop gets overwhelmed and collapses, just my guess.

    Or talk to Rennen Design Group about a custom cog.

    There appears to be a lot of custom fabricators outside of the US that fabricate for track bikes.
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  14. #14
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    Oh shit, you havent seen the HNC threads have you?
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    I'm guessing you mean HBC, just tracked them down, guess I should have checked first. Next you'll be telling me Matt Chester isn't fulfilling his orders.
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  16. #16
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    Mikesee,
    Surly has a 58mm 5 bolt 28t narrow wide in stainless steel.
    Shows in stock at QBP.

  17. #17
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    is warhawk industries still around? never ordered but they make custom chainrings and cogs out of whatever material you want.

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    I'm just curious why such a big cog is needed? I've got an Endless 24T that I've used with a 22T front ring on a fat bike. I don't think I would go any lower on a singlespeed (and that's only for the gnarliest, steep terrain).

  19. #19
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    Quote Originally Posted by 2:01 View Post
    I'm just curious why such a big cog is needed? I've got an Endless 24T that I've used with a 22T front ring on a fat bike. I don't think I would go any lower on a singlespeed (and that's only for the gnarliest, steep terrain).

    Fat bike, off piste use. Like this:

    Also, it's going to be paired with an Efneo (if it ever shows up...) which has a 28t chainring.

    Thus, 28 x 28t 1:1 main gear, but with 2 higher gears to shift to if the conditions get firmer, or paved.

    Not everyone's cup o' tea, for sure.

  20. #20
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    Quote Originally Posted by mikesee View Post
    ...Also, it's going to be paired with an Efneo (if it ever shows up...) which has a 28t chainring...
    I'm waiting too. Same purpose.
    As little bike as possible, as silent as possible.
    Latitude: 57º36' Highlands, Scotland

  21. #21
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    This is the carrier/spider version I was thinking of but can only find in 104 bcd, stainless steel available also so might be an easy mod.

    40 42t 104 BCD chainring to Shimano SRAM freehub adapter aluminium

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  22. #22
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    With that 28T cog you took from the cassette, you could get something like this:

    https://www.amazon.com/Origin8-Ultim.../dp/B00TG3BOUW

    And drill out the holes yourself. Or try to see if Tomicogs will come out of retirement to drill them for you.

    TomiCOGs

  23. #23
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    Custom parts here:

    https://www.mtbtools.com/custom-parts/

    They make some strange looking 36/38/41 tooth cogs.

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  24. #24
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    Quote Originally Posted by sonoran pug View Post
    Mikesee,
    Surly has a 58mm 5 bolt 28t narrow wide in stainless steel.
    Shows in stock at QBP.

    Thanks for the reminder. Ordered.

    Kind of ironic that I had forgotten about this option. I had it in Item Watch at QBP for more than a year, and apparently forgot about it because it was so long overdue.

  25. #25
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    Got it. Installed on the GCA, installed on the freehub, installed into the frame.

    Efneo says my gearbox is shipping next week. I love it when a plan comes together.
    Attached Thumbnails Attached Thumbnails 28t SS cog?-img_0735.jpg  


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    ^
    Rigid SS 29er
    Fat Lefty
    SS MonsterCross
    SS cyclocross
    all steel

    Stop asking how much it weighs and just go ride it.

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