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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.

  4. #4
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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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    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.

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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; 11-14-2017 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.

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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).

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

  27. #27
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    Got the bike built and ridden with this Surly 28t N/W cog.

    TR here: Big Wheel Building: Rock, ice, and water.

    Turns out the 28t might still not be big enough for sustained climbing. I experimented with a 34t cog (broken out of a 9 speed SRAM cassette) and it might have been too low. Plus when I really got after it I'd just peel the chain right off the (ramped) cog.

    Now onto a 32t unramped chainring (mounted to the GCA using a Surly Mr Whirly 58/94 spider...) and will experiment with that this weekend.

    The cool thing about having the 3 speed in mixed terrain is that you can never really find a gear that works well all the time, so you're still reliant on SS skills and technique. Superman could probably push a true SS in this terrain with this much gear on the bike, but I can't.

  28. #28
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    I guess if you settle on 32t than that 104 BCD adapter would work.

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    Quote Originally Posted by bikeny View Post
    I guess if you settle on 32t than that 104 BCD adapter would work.

    Might yet end up on a 30t, but either way, yeah -- i think the 104 adapter would work.

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    Whole thread dedicated to this bike, here.

  31. #31
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    Pinion has a 30t coq, if that helps?

    Pinion P8230

    I could have sworn they had 28t too but could not find one.
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  32. #32
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    Quote Originally Posted by KK89 View Post
    Pinion has a 30t coq, if that helps?

    Pinion P8230

    I could have sworn they had 28t too but could not find one.
    That's great info there, didn't know that existed. Looks like they make 24t, 26t, and 30t cogs, as well as the previously mentioned 104BCD spider. They also have 'longlife' versions of the chainrings with thicker teeth for use with 1/8" chains. Prices aren't terrible either.

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    Mikesee, wondering how long ago you acquired that "GCA" that you mounted the 28T cog to? I've contemplated an idea like that too, but unable to source Velobike's mention of the pinion adaptor at the moment and want to run smaller inner chainrings like you did. Thanks.
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  34. #34
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    Quote Originally Posted by Jason Rides Bikes View Post
    ... unable to source Velobike's mention of the pinion adaptor at the moment and want to run smaller inner chainrings like you did.
    Try Pinion direct

    https://pinion-bikes.de/PINION-Spide...mm-ArtNr-P8200
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  35. #35
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    At least 5 years ago.

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