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Old 05-12-11, 08:01 PM   #1
Zaphod Beeblebrox 
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Cycle Underground Chainrings

Has anyone used Cycle Underground to get hard-to-find sized chainrings in specific sizes?

http://www.cycleunderground.com.au/chainringdesigns.htm

I'm trying to get a 49T 86BCD chainring and they're hens teeth near as I can tell.
These guys seem interesting.
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Old 05-12-11, 08:28 PM   #2
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That does look interesting. I could get replacements for my Stronglight 93s for about what they're selling for on eBay and in sizes that aren't available.
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Old 05-12-11, 08:43 PM   #3
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i'm not sure what shipping runs, I've got an inquiry into them. I can't imagine its much more than 15 bux to ship
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Old 05-12-11, 09:11 PM   #4
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Hmmmmm. Hmmmmm.

I wonder if they'd be willing to tackle Herse-style 3-pin rings for my Stronglight TSsssesssss...?
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Old 05-12-11, 09:25 PM   #5
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Why no 118mm BCD (Zeus)?
Why no 128mm BCD (Nervar)? One can admittedly adapt a 130mm ring pretty easily.
Why no 41 and 42T 144mm?
Why no 6-bolt 152mm (TA) and 157mm (Simplex)?
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Old 05-12-11, 09:25 PM   #6
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I'd be VERY interested to know if they can reproduce the uber-rare 37t Stronglight 93 (122BCD) chainring?

Even cooler if they could do the drilled "bis" version.

Their site says they can do 122bcd, and their designs include the "look" for the 93 rings. BUT not the small teeth count versions...

Anyone interested in a "group" ask?
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Old 05-12-11, 09:26 PM   #7
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From their site:

We also have avaialble in any of the designs above the following bolt circle diameter (bcd) 58 64 68 74 86 94 102 120 122.
No doubt we have probably missed some bcd sizes that you may need.
Simple contact us and if need be we will add that size of bcd to our jig and specially cut that chainring for you......no extra charge.
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Old 05-13-11, 03:17 AM   #8
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I had a 151 BCD ring made a couple of years back. Very impressed, cool guys to deal with!
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Old 05-13-11, 04:11 AM   #9
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But it appears they are not machining for us gear hounds. These are really only for SS/FG and the occasional conversion of a 5 speed Collegiate.

Quote:
Originally Posted by Cycle Underground
Because our chainrings are not designed for front gear changes...
Batavus, are you using an FD with your 151 BCD?
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Old 05-13-11, 06:01 AM   #10
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Quote:
Originally Posted by John E View Post
Why no 118mm BCD (Zeus)?
Why no 128mm BCD (Nervar)? One can admittedly adapt a 130mm ring pretty easily.
Why no 41 and 42T 144mm?
Why no 6-bolt 152mm (TA) and 157mm (Simplex)?
....oh , you're just too old-fashioned, sir.
But I agree.
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Old 10-07-11, 08:16 AM   #11
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I'm reviving this dead but not yet badly decomposed thread because I'm wondering if these guys (Cycle Underground) are still in business. Google takes you to a static site that claims Cycle Undergrond has a new improved Web site in the works, but no other information. They don't answer email anymore.
I would like to try these guys again as part of my ongoing quixotic effort to get someone to make me a 122 BCD triplizer ring. They told me a year and a half ago that they could do it, but I stupidly didn't follow up and now maybe it's too late. Still waiting for the outfit in North Carolina that said they could make the ring to actually do it. I email them once a month and they always say "yes, we're going to make your ring any day now." At least I haven't paid them anything yet.
Also, FWIW, I asked the guy at CU about their tooth design--whether it was applicable to derailleur gearing or SS/FG only--and was told that they can make either tooth style. Except that now they're apparently not making anything....
Any of you Australians know what's going on with these guys?
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Last edited by jonwvara; 10-07-11 at 08:18 AM. Reason: the heartbreak of typos
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Old 10-07-11, 10:12 AM   #12
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This is a good thread, and a very worthy project.

There is a guy who is doing some amazing machine work. He's currently doing hubs. See this review! http://wheelfanatyk.blogspot.com/201...b-is-born.html

He sent a note saying that when he's done with this run of hubs, he's moving onto cranks and would consider a prototype triplizer for 122bcd.

I'm still hunting for a 37t 122bcd ring, should anyone discover one!!!
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Old 10-07-11, 02:13 PM   #13
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I was out riding my stronglight-equipped bike the other day and that totally reminded me that I want that triplizer badly.
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Old 10-08-11, 01:35 AM   #14
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Not sure what's happening with Cycle Underground but they've always been pretty bad with emails. Try phoning them (check the timezone first!).

Btw, the rings work fine with derailleurs as far as I'm concerned. They just don't have ramps and pins like modern chainrings for smoother shifting.

These guys in the UK do custom rings, too. Might want to check with them: http://www.highpath.net/
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Old 10-08-11, 02:37 AM   #15
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Quote:
Originally Posted by Wotan View Post
Might want to check with them: http://www.highpath.net/
Quote:
Please note

I regret that I've stopped making chainrings and sprockets.
Thank you to all my loyal customers who have sent me so many interesting
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On this page you can see some of the things I used to make...
seems like it would have been a great option.
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Old 10-08-11, 10:52 AM   #16
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Hmmm, this all makes me curious - what would be a "fair" price on CNC rings in hard to find bolt circles? Does anyone know the ID of a 122 bcd ring. Not the bcd it self but the diameter where it meets the crank spider.

-Andy
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Old 10-08-11, 11:32 AM   #17
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Quote:
Originally Posted by jonwvara View Post
I'm reviving this dead but not yet badly decomposed thread because I'm wondering if these guys (Cycle Underground) are still in business. Google takes you to a static site that claims Cycle Undergrond has a new improved Web site in the works, but no other information. They don't answer email anymore.
I would like to try these guys again as part of my ongoing quixotic effort to get someone to make me a 122 BCD triplizer ring. They told me a year and a half ago that they could do it, but I stupidly didn't follow up and now maybe it's too late. Still waiting for the outfit in North Carolina that said they could make the ring to actually do it. I email them once a month and they always say "yes, we're going to make your ring any day now." At least I haven't paid them anything yet.
Also, FWIW, I asked the guy at CU about their tooth design--whether it was applicable to derailleur gearing or SS/FG only--and was told that they can make either tooth style. Except that now they're apparently not making anything....
Any of you Australians know what's going on with these guys?
The link in the first post (and others on the site) seem to work... not sure if that means anything or not.
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Old 10-08-11, 11:48 AM   #18
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Quote:
Originally Posted by Andycapp View Post
Hmmm, this all makes me curious - what would be a "fair" price on CNC rings in hard to find bolt circles? Does anyone know the ID of a 122 bcd ring. Not the bcd it self but the diameter where it meets the crank spider.

-Andy
fair price to me is whatever TA is charging for theirs, plus whatever time it takes to program the machine. Price out cad/cam time and you'll see that you can't afford a fair price. People that run this kind of business almost never charge a fair price, which is why they don't usually last past their tolerance for unreasonable customers.
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Old 10-08-11, 12:00 PM   #19
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Only have to program it once per design... This gets absorbed by running multiple parts. Small shop, low overhead, and "freedom of expression" can go a long ways when it comes to making cool stuff...
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Old 10-08-11, 01:18 PM   #20
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Only have to program it once per design... This gets absorbed by running multiple parts. Small shop, low overhead, and "freedom of expression" can go a long ways when it comes to making cool stuff...
And small "tabletop" CNC rigs are pretty cheap nowadays.
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Old 10-08-11, 01:39 PM   #21
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Does anyone know the ID of a 122 bcd ring. Not the bcd it self but the diameter where it meets the crank spider.

-Andy

117mm.
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Old 10-08-11, 07:13 PM   #22
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This falls into the "Holy Crap!" category:

Peter B from here and CR list fame, passed this web site onto me. They will manufacture rings "on demand" but it is apparently not cheap. Real problem: the site is in Chinese. Anyone read this?

http://homepage1.nifty.com/ct-seizan/sub03.html

Check out the 36t 122bcd under the 105bis header!!!

Someone, Anyone, tell what that would cost!?!?!?!!??
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Old 10-08-11, 09:33 PM   #23
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Quote:
Originally Posted by LeicaLad View Post
117mm.
Not sure on that...

But I do have a stronglight 104(?) with a 122 bcd(?)down at the shop. I'll have to grab that before I can get the needed dimensions. I really think this is a doable project for me. I just have to be a little patient waiting for a weekend that a)I'm free and b) the mill's open/between jobs.

Anyone want to post a pic or two for aesthetic purposes?
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Old 10-09-11, 07:17 AM   #24
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Check this out! A 122bcd triplizer! ! !



here: http://homepage1.nifty.com/ct-seizan/122adp4232.jpg
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Old 10-09-11, 07:22 AM   #25
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LeicaLad; I'm wondering what it would take to get these cut in China ???? Might be too much trouble given the relatively small demand.
Certainly would/should be less expensive than the above Japanese site.
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