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130mm to 74mm BCD Adapter Chainwheel/Spider?

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130mm to 74mm BCD Adapter Chainwheel/Spider?

Old 10-16-14, 03:05 PM
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130mm to 74mm BCD Adapter Chainwheel/Spider?

There seem to be plenty of 110mm BCD to 74mm BCD "middle rings". That is, rings that mount to the crank with a 110mm BCD pattern and have holes to bolt a 74mm BCD pattern inner ring to the middle. Does such a thing exist for using 130mm BCD cranks with a small inner chainwheel -- 74mm, 94mm or 110mm BCD? All the links that I have turned up so far are dead or point to no-longer made parts.

And, further, is it possible to find a large (48T to 56T) 130mm chainwheel with an integrated "spider" to use with a small (24-30T) inner and skip the middle? I know that the Specialites TA type rings are ideal for this. I'm wondering if there is a way to kludge the same thing with more common 130mm cranks.

--- edit --

Another way to put it... Is there a way to duplicate the following drivetrain using NEW, mass produced parts?

The Cyclotouriste is unbeatable as a wide range double, however. Here's an example:


This is on my
Hetchins, it's a 50-28 double, running with a 12-28 9-speed cassette in back. It is mounted on a Shimano UN series bottom bracket, 115 mm. This sets the chainline up closer in than most double cranksets.
The idea of this setup is that the 50 tooth chainring is usable with all 9 rear sprockets, and on most rides the 50 is the only chainring I use.
The 28 tooth chainring is the emergency "bail out" gear for unusually steep hills, or for when I'm all tuckered out. It is only used with the larger rear sprockets, but when I need that low a gear, I don't mind the big jump.

Last edited by justinzane; 10-16-14 at 04:13 PM. Reason: add info
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Old 10-16-14, 03:21 PM
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Peter White cycles imports French TA Chainrings
these are 130 pcd
Alize K/+ 38 teeth silver 9 speed... $ 122.00 each, All .
Alize K/+ 39 teeth
Alize K/+ 40 teeth
Alize K/+ 41 teeth
Alize K/+ 42 teeth

larger tooth counts , you would be making a Custom Order Paying more and waiting.

Last edited by fietsbob; 10-16-14 at 03:28 PM.
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Old 10-16-14, 03:34 PM
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Originally Posted by fietsbob
Peter White cycles imports French TA Chainrings
I looked at those. Unfortunately, they seem to top out at 42T. That and they are $122 a piece! I'm wondering if it is possible to do something like spacer-as-needed + 130mm-50T "middle" + 74mm-30T "inner". The Specialites TA "traditional" ProVis5 allows that, but has an odd BCD of 80mm. That kinda locks one into TA or knock-off cranks which makes shopping challenging.

I've got an old 172.5 mm arms 130mm BCD JIS 52-38T Suntour/Sugino set that I've just partially cleaned. It needs new bolts, but otherwise is in perfectly serviceable shape. I was just kicking around the idea of making a super-wide range double out of it. If not, oh, well.
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Old 10-16-14, 03:41 PM
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You, it seems have Champagne Ideas on a old Milwaukee beer budget ..
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Old 10-16-14, 03:42 PM
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Originally Posted by justinzane
I've got an old 172.5 mm arms 130mm BCD JIS 52-38T Suntour/Sugino set that I've just partially cleaned. It needs new bolts, but otherwise is in perfectly serviceable shape. I was just kicking around the idea of making a super-wide range double out of it. If not, oh, well.
You'll probably have the best luck (and/or spend the least money) trading it for a 130/74 triple crank and setting up your proposed wide-range double on that using the two inner rings.
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Old 10-16-14, 04:06 PM
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Originally Posted by fietsbob
You, it seems have Champagne Ideas on a old Milwaukee beer budget ..
That why I started brewing my own way back when I drank. Coriander (cilantro) spiced mead used to cost about 6 cents on the dollar when made at home. Though growing up near the Stoudt's brewery helped distort my expectations in that area.

Finding ways to accomplish the expensive on the cheap is somewhat of an odd hobby of mine. I seem to get more enjoyment out of something that I have cobbled together than something I have bought. When I wanted a decent subwoofer, I did some research and modeling (as in computer simulations) and then made a custom one out of sonotube, particle board and a boatload of paint. In the limited testing I did, it works as well as something that would retail for $200+; yet I spent less than $75 on it. And, I learned a lot about acoustics in the process.

I even ended up writing a PulseAudio plugin to low-pass filter the subwoofer channel and high-pass the center so that I could tune the sound to the speakers I built. Would most people do that? No. But, everytime my wife and I sit down in the living room, I'm just a little happier listening to sound processed by code I wrote and output by speakers I built.

Even if someone gave me a $10k top-of-the-line pro level bike; I would still end up messing with it. For me, riding is great, but hacking on the bike adds to the enjoyment.
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Old 10-16-14, 04:11 PM
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Originally Posted by ThermionicScott
You'll probably have the best luck (and/or spend the least money) trading it for a 130/74 triple crank and setting up your proposed wide-range double on that using the two inner rings.
I've looked at a few road triples, from Vuelta to Ultegra, and I cannot figure out how to lose the "outer" and still have a 48T+ main ring. That is why I was asking about any large rings that have the integrated 74mm holes.
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Old 10-16-14, 04:17 PM
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so you got the message , get a more common. 110-74 triple crank ? use the middle and inner chainring .
cheap Sugino chainrings dont have the STI quick shifting features ,

so you can flip them over to face the other way . .. the up shift will be a bit slower , You do that shift, at the top of a Hill.

the outer spot will be empty. though you can get an even bigger one and file the teeth off, and put it there .

there are bigger chainrings . and chainguard discs .. mass produced

You happent to see the TA that they quit making the crankarms , beat auctions for those .
the French company still makes the chainrings .. as other threads showed there are copies of the arms.

Last edited by fietsbob; 10-16-14 at 04:33 PM.
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Old 10-16-14, 04:39 PM
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Originally Posted by justinzane
I've looked at a few road triples, from Vuelta to Ultegra, and I cannot figure out how to lose the "outer" and still have a 48T+ main ring. That is why I was asking about any large rings that have the integrated 74mm holes.
You run whichever 2 rings you want, with the larger 130mm ring on the "middle" position, the smaller 74mm ring on the inner position, and nothing on the outer, and use BMX chainring bolts. If you're buying a triple crank anyway, you may as well get a 110/74 so you can enjoy a larger variety of chainrings.
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Old 10-16-14, 04:56 PM
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Originally Posted by fietsbob
so you got the message , get a more common. 110-74 triple crank ? use the middle and inner chainring .
Figuring that finding something to work with the 130mm BCD set was unlikely, I've been thinking about the Vuelta Corsa triple. It is about as cheap as one can get for a crankset with replaceable chainrings. If I can't make the wide double work, so be it. I'll have a triple which is OK. Either that or their even cheaper compact double. I'm hesitant to give up the granny, but for less than the cost of lunch at my favorite Indian restaruant, it is not that painful a mistake.

And, in the mean time, I'll just keep an eye on auctions for the real cyclotouriste. The LBS owner has one IIRC, but it is one his personal prize Motobecane Grand Jubilee(?).

Thanks!
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Old 10-16-14, 07:11 PM
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What about this XXcycle - Plateau Stronglight Intermediaire porteur triple 130/74 - en. Not too expensive.
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Old 10-16-14, 10:06 PM
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Originally Posted by darkhorse75
You rock! 2 teeth short of what I wanted, but then I can go with an 11T on the back to make up the difference.

XXcycle is a wonderful shop! Even with the transatlantic shipping, their prices are excellent. Weak Euro? Perhaps it is a good time to buy before the (US) Fed unwinds its gargantuan "stimulus" balance sheet?
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Old 10-17-14, 08:47 AM
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Seeing a use of the new Brompton cranks , they are made to mount just 1 chainring off the back of the crank spider..

To use that on the actual, folding, bike a longer BB would be needed..
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