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24t cog, who makes them?

7212 Views 87 Replies 25 Participants Last post by ATBScott, Jul 30, 2009

bikeny

Discussion Starter · Jun 25, 2009

I use a 24t cog for my preferred SS gearing. I have been very happily using a Boone cog, and it has been great. But I am starting to fear the day it wears out, as I cannot get another one. Yes I have tried all the available channels. So I was doing a search and came up with 2 companies making 24t SS cogs, Endless and Rennen. Both are made from 7075-T6 aluminum. I REALLY don't like the idea of aluminum for a SS cog, and would rather have steel or titanium. I tried a 22t Endless for a couple of rides a few years ago, and the teeth showed significant mushrooming. I am not a huge clyde (185lbs), and I don't think I have superhuman leg stregth, so I am not sure what to make of this. I have seen plenty of reviews from people happily using Endless cogs, even in smaller sizes. Did I just get a bad cog? That experience just has me scared about trying another aluminum cog.

Anyway, does anyone have any recommendations for me?

Thanks,
mark

1 - 20 of 88 Posts

Dremer03

· #2 · Jun 25, 2009

What size is your chain ring? You could go with a smaller cog in the rear and a larger gear in the front.

boomn

· #3 · Jun 25, 2009

bikeny said:
I use a 24t cog for my preferred SS gearing. I have been very happily using a Boone cog, and it has been great. But I am starting to fear the day it wears out, as I cannot get another one. Yes I have tried all the available channels. So I was doing a search and came up with 2 companies making 24t SS cogs, Endless and Rennen. Both are made from 7075-T6 aluminum. I REALLY don't like the idea of aluminum for a SS cog, and would rather have steel or titanium. I tried a 22t Endless for a couple of rides a few years ago, and the teeth showed significant mushrooming. I am not a huge clyde (185lbs), and I don't think I have superhuman leg stregth, so I am not sure what to make of this. I have seen plenty of reviews from people happily using Endless cogs, even in smaller sizes. Did I just get a bad cog? That experience just has me scared about trying another aluminum cog.

Anyway, does anyone have any recommendations for me?

Thanks,
mark

Did you run the new cog with an old chain? If so, how old was the chain?

Frs1661

· #4 · Jun 25, 2009

Vtolds said:
What size is your chain ring? You could go with a smaller cog in the rear and a larger gear in the front.

I believe you mean smaller rear cog and smaller chainring...

For example, 22:16 gives you nearly the same ratio as 32:24... and both are common chainring/cog sizes.

p nut

· #5 · Jun 25, 2009 (Edited)

Vtolds said:
What size is your chain ring? You could go with a smaller cog in the rear and a larger gear in the front.

Do you mean smaller in the rear and the front?

But I'm curious to know what you're running in the front, as well. I'm currently at 33x20 and couldn't imagine running 24 or even 22. I live in the rockies with plenty of hills, too. Plus, I'm not that strong of a rider, so not saying I'm some macho guy or something.

EDIT: Echo is strong in here today.

Dremer03

· #6 · Jun 25, 2009

I ride 32x18, thats why I am also curious to see what the front gearing is.

p nut

· #7 · Jun 25, 2009

Sorry, that question was meant for the OP. Oh, forgot to mention I'm on a 29er.

sunset1123

· #8 · Jun 25, 2009 (Edited)

I have not used these, but they are available as big as 25T! (alu though) -- https://www.universalcycles.com/shopping/product_details.php?id=22628&category=40

It wouldn't be unthinkable to go with a 32x24 or a 34x24 for a purpose built technical bike. I'm running one of my bikes 32x22 on 26" for just that reason.

Going nowhere fast, but I sure do love playing in the rocks.

If that's really the intention here (just guessing) it would make sense to consider a change up front. Go to a different crank where you could use a 26T chainring, for instance, and run an 18T or 20T out back. No trouble finding those in steel.

edit: or you could go with -- https://sales.light-bikes.com/extralite/images/OctaRamp30T.jpg

edit: heh.. and yeah... echo.

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Frs1661

· #9 · Jun 25, 2009

You could try searching for more 'Trials' oriented parts... those guys run crazy low gearing SS. Or perhaps asking in a trials forum, if changing your chainring is undesirable for whatever reason.

bikeny

Discussion Starter · #10 · Jun 25, 2009

Thanks for all of the replies everyone. I am currently running 34:24 as my normal gearing. I do have a 22t that I use on flatter trails. Oh yeah, and I am on a 29er with the fattest tires I can find! My normal rides have lots of steep climbs and not much in the way of flats, so I don't have to worry about spinning out. There are still some extended technical climbs that I can't make it all the way up yet. I am in NY, and most of my local trails, the ones I like to ride, are all very slow, very technical tight singletrack with lots of steep ups and downs, therefore the low gearing.

So that is why I use the low gearing I do. The next problem is, I really like how smooth my drivetrain is, and would rather not go to smaller rings and cogs. I also love my Boone 34t chainring! So it looks like the Endless and Rennen are the only choices, unless Boone decides to fire the machines up again!

Here are some ratios close to what I am using:
Current:
34:24=1.417
Others:
32:22=1.455
30:21=1.428
33:23=1.435

Looks like King will be making cogs up to 23t soon, but then i need to find a nice new 33t ring.

Mark

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boomn

· #11 · Jun 25, 2009

I don't think ActionTec makes a 24t, but I'm pretty sure they are still actively making cogs at least. Maybe they could be convinced to offer larger sizes?

elrancho66

· #12 · Jun 25, 2009

Endless KA cogs work for me

bikeny said:
I use a 24t cog for my preferred SS gearing. I have been very happily using a Boone cog, and it has been great. But I am starting to fear the day it wears out, as I cannot get another one. Yes I have tried all the available channels. So I was doing a search and came up with 2 companies making 24t SS cogs, Endless and Rennen. Both are made from 7075-T6 aluminum. I REALLY don't like the idea of aluminum for a SS cog, and would rather have steel or titanium. I tried a 22t Endless for a couple of rides a few years ago, and the teeth showed significant mushrooming. I am not a huge clyde (185lbs), and I don't think I have superhuman leg stregth, so I am not sure what to make of this. I have seen plenty of reviews from people happily using Endless cogs, even in smaller sizes. Did I just get a bad cog? That experience just has me scared about trying another aluminum cog.

Anyway, does anyone have any recommendations for me?

I have been running Endless Kick A$$ cogs on a few of my bikes for the last 3 years,,,,,,,,,,,,they have held up fine, but the largest cog has been a 21. I would guess a few of my 20's have at least 2000 miles on them and are still in fine condition:thumbsup:

bikeny

Discussion Starter · #13 · Jun 25, 2009

sunset1123 said:
I have not used these, but they are available as big as 25T! (alu though) -- https://www.universalcycles.com/shopping/product_details.php?id=22628&category=40

That is the cog I mentioned in my original post, and they don't have any in stock anyway.

sunset1123 said:
edit: or you could go with -- https://sales.light-bikes.com/extralite/images/OctaRamp30T.jpg

And no, I don't want a smaller chainring, especially that one! Then I would just have to replace the ring and cogs more often!

p nut

· #14 · Jun 25, 2009

Going down to 32 would give you better clearance and better component selection for both the chainring and cog (also, maybe cheaper?). I'm using Surly steel rings both front and back and it feels very smooth to me.

frankarooney

· #15 · Jun 25, 2009

Have you looked at Singlestar cogs? Hugely expensive, but so, so sweet.

www.singlestar.de

Gear Orange Circle Clutch part

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sunset1123

· #16 · Jun 25, 2009

^ ^ ^ drool.

$194 USD. wow.

kdiddy

· #17 · Jun 26, 2009

I've seen a cog that mounts a granny gear chain ring to it, so the cog essentially is just a splined hub with a 4 bolt hole pattern. You could use any 24T granny gear that you want with that. I can't remember where i saw it or what it was, but it would do what you want.

Strike the primer

· #18 · Jun 26, 2009

kdiddy said:
I've seen a cog that mounts a granny gear chain ring to it, so the cog essentially is just a splined hub with a 4 bolt hole pattern. You could use any 24T granny gear that you want with that. I can't remember where i saw it or what it was, but it would do what you want.

SPICER Cycles had those.

Wish I Were Riding

· #19 · Jun 26, 2009

bikeny said:
I REALLY don't like the idea of aluminum for a SS cog, and would rather have steel or titanium. I tried a 22t Endless for a couple of rides a few years ago, and the teeth showed significant mushrooming. I am not a huge clyde (185lbs), and I don't think I have superhuman leg stregth, so I am not sure what to make of this. I have seen plenty of reviews from people happily using Endless cogs, even in smaller sizes. Did I just get a bad cog? That experience just has me scared about trying another aluminum cog.

Well, I'm no great SS rider, but I play one on TV (and I slept at a Holiday Inn).

I've used an Endless 24T KA Cog with a 36T chainring for my gearing. I used it for a long time too. I never noticed any problems with wear. I won't say you got a bad one, because I only ever used one, but I think it might be worth another try. It's not like they cost $192.

I have not been riding that bike for a while, and I've been using 36x22 on a 650B rear wheel. I bet 24T would be nicer on my legs again...

bikeny

Discussion Starter · #20 · Jun 28, 2009

Holy Crap! $194 for a cog! I think I will pass. Thanks again for all of the replies. I decided that I really like my current gearing and do not want to play with other ratios. so I placed an order for a Rennen 24t cog. I will also keep emailing Boone in hopes that he gets sick of me and just makes a few more for me!

Mark

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