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-   -   Cycle Underground Chainrings (https://www.bikeforums.net/classic-vintage/734956-cycle-underground-chainrings.html)

Zaphod Beeblebrox 05-12-11 08:01 PM

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.

Grand Bois 05-12-11 08:28 PM

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.

Zaphod Beeblebrox 05-12-11 08:43 PM

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

Captain Blight 05-12-11 09:11 PM

Hmmmmm. Hmmmmm.

I wonder if they'd be willing to tackle Herse-style 3-pin rings for my Stronglight TSsssesssss...?

John E 05-12-11 09:25 PM

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)?

LeicaLad 05-12-11 09:25 PM

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?

LeicaLad 05-12-11 09:26 PM

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.

Batavus 05-13-11 03:17 AM

I had a 151 BCD ring made a couple of years back. Very impressed, cool guys to deal with!

pastorbobnlnh 05-13-11 04:11 AM

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. :lol:


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?

rootboy 05-13-11 06:01 AM


Originally Posted by John E (Post 12636018)
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.

jonwvara 10-07-11 08:16 AM

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?

LeicaLad 10-07-11 10:12 AM

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!!!

clasher 10-07-11 02:13 PM

I was out riding my stronglight-equipped bike the other day and that totally reminded me that I want that triplizer badly.

Wotan 10-08-11 01:35 AM

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/

gaucho777 10-08-11 02:37 AM


Originally Posted by Wotan (Post 13335482)
Might want to check with them: http://www.highpath.net/


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
orders over the past 25 years. I almost feel that I know some of you
personally - indeed some of you have become good friends!
On this page you can see some of the things I used to make...

:notamused: seems like it would have been a great option.

Andycapp 10-08-11 10:52 AM

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

Pars 10-08-11 11:32 AM


Originally Posted by jonwvara (Post 13331844)
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.

unterhausen 10-08-11 11:48 AM


Originally Posted by Andycapp (Post 13336378)
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.

Andycapp 10-08-11 12:00 PM

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...

BlueDevil63 10-08-11 01:18 PM


Originally Posted by Andycapp (Post 13336539)
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.

LeicaLad 10-08-11 01:39 PM


Originally Posted by Andycapp (Post 13336378)
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.

LeicaLad 10-08-11 07:13 PM

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!?!?!?!!??

Andycapp 10-08-11 09:33 PM

2 Attachment(s)

Originally Posted by LeicaLad (Post 13336820)
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?

LeicaLad 10-09-11 07:17 AM

Check this out! A 122bcd triplizer! ! !

http://i120.photobucket.com/albums/o...122adp4232.jpg

here: http://homepage1.nifty.com/ct-seizan/122adp4232.jpg

rootboy 10-09-11 07:22 AM

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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