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Stronglight crank with "file-ium"?

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Stronglight crank with "file-ium"?

Old 03-14-18, 11:41 PM
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Stronglight crank with "file-ium"?

Was that a thing?

I've got this Stronglight crankset. I think it's a 93, but it's not like any I've seen a picture of. For one thing the chain rings are...incomplete? More curiously, the ends of the crank arms are beveled. There are some scratches and dings in the metal from use, but I can't see any obvious signs of filing or cutting. So assuming this was modified by a previous owner, they did a really nice job polishing it afterward.

Has anyone seen something like this?





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Old 03-14-18, 11:50 PM
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Interesting. Someone had a bit too much time on their hands, I'd say.

I'm guessing they could have removed more mass without compromising critical stress areas by drilling a bunch of little holes in the chain rings inboard of the teeth. There may even be a word for that, but what do I know? Maybe they had a file on hand and no drill.
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Old 03-14-18, 11:51 PM
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Boy, that looks like a lot more work than drilling - especially trying to keep the facets in proportion. Neat find

DD
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Old 03-15-18, 12:06 AM
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For sure a lot of work. This was on that Urago that I traded to Andy A. Every component on that bike was trick. At first glance I thought maybe they had scrimped on the bottom bracket when I saw that it was a cartridge, but that turned out to be a Phil Wood. I would have said they didn't cut any corners, but clearly they did cut some corners on the crank!
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Old 03-15-18, 04:15 AM
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-----

Recall this chainset was discussed a bit back when it was still on the bike.

We should probably mention for readers unfamiliar with them that there are two generations of Stronglight 93.

At launch in 1967 there was a fairly heavy chamfer at the distal end of the arm around the pedal hole.

The design led to quite a few failures in the form of a radial crack from the pedal hole out to the edge.

A few years later there was a revision and Verot put more "meat" into this area.

The set employed for an example at VB shows both types as the drive side arm is early, G1, and the non-drive side arm is late, G2.

Whoever did the work in this case certainly did a beautiful job but probably not a good place to remove material...



Model 93 ended in 1977 when it was succeeded by model 105.

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Last edited by juvela; 03-15-18 at 07:06 AM. Reason: addition
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Old 03-15-18, 06:58 AM
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This "sculpting" would be pretty easy to do with a belt or disc sander. My guess is there may have been some road rash that he wanted to disguise a bit, then things got out of hand.
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Old 03-15-18, 11:42 AM
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Originally Posted by Hudson308 View Post
My guess is there may have been some road rash that he wanted to disguise a bit, then things got out of hand.
That seems to be the best explanation yet.

It may not have anything to do with reality, but seems likely.
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Old 03-15-18, 01:04 PM
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Originally Posted by Hudson308 View Post
My guess is there may have been some road rash that he wanted to disguise a bit, then things got out of hand.
I agree that this is entirely plausible, but what about the chainrings? Did they make them like this. All the ones I remember seeing had an extra arc at the bolt circle. Maybe the guy was riding along one day and thought to himself, "This is nice, but I wish my chainrings would flex more when I pedal."
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Old 03-15-18, 01:59 PM
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Originally Posted by Andy_K View Post
I agree that this is entirely plausible, but what about the chainrings? Did they make them like this. All the ones I remember seeing had an extra arc at the bolt circle. Maybe the guy was riding along one day and thought to himself, "This is nice, but I wish my chainrings would flex more when I pedal."
-----

There was a period in the '70's when pro teams began cutting away the inner ring on Campag Record chainwheels. Eventually the manufacturer began offering them that way.

Zeus did something similar with their chainwheels around the same time.

---

Perhaps my eyes are going but it looks like there may be helicoils in there.

-----
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Old 03-15-18, 02:14 PM
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@juvela - Thanks for that explanation. Looks like I have a G1 set that came on the '72 Motobecane Le Champion.
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Old 03-15-18, 02:29 PM
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Originally Posted by juvela View Post
Perhaps my eyes are going but it looks like there may be helicoils in there.
I think I see what you're referring to in the pictures. I hadn't noticed it before. It's definitely possible. The cranks are marked as being French threaded, but they are actually not. I had just assumed they were simply re-tapped.
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Old 03-15-18, 02:44 PM
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Originally Posted by Andy_K View Post
I think I see what you're referring to in the pictures. I hadn't noticed it before. It's definitely possible. The cranks are marked as being French threaded, but they are actually not. I had just assumed they were simply re-tapped.
-----

An easy way to check would be with a magnet.

The coils typically employed in the trade are steel ones produced by ELDI of Germany.

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Old 03-15-18, 02:49 PM
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Originally Posted by Andy_K View Post
I agree that this is entirely plausible, but what about the chainrings? Did they make them like this. All the ones I remember seeing had an extra arc at the bolt circle. Maybe the guy was riding along one day and thought to himself, "This is nice, but I wish my chainrings would flex more when I pedal."
The Stronglight 105 and 105bis had chainrings without the inner web... similar in style to Campy Super Record.

Velobase has a shot of the 105bis ring, which is drilled
VeloBase.com - Component: Stronglight 93 / 105bis (Large)

page 16 of the 1976 Palo Alto catalog has some tiny photos and a good text description of the 105 and how it differs from the model 93:
p16.jpg

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Old 03-15-18, 11:49 PM
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Originally Posted by Andy_K View Post
I think I see what you're referring to in the pictures. I hadn't noticed it before. It's definitely possible. The cranks are marked as being French threaded, but they are actually not. I had just assumed they were simply re-tapped.
They look like Eldi inserts.
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Old 03-16-18, 06:04 PM
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-----

Andy_K, a suggestion -

One can see by the two upper chamfering facets that the set began life of the first generation type.

In order to fit helicoils one must ream out the pedal hole to a larger size and then tap it to accept the coils. This is removing material from the arm right at the spot where first generation arms tend to fail. When one combines this with the material removed by the modifier we are getting into the realm of danger.

Do not know your plans for this set, if you envision usage. It certainly should not be used by a large or heavy rider. Crank arm failures tend to occur under the heaviest pedal loads as in climbing and/or accelerating. They can of course occur at any moment of use. Hate to think of a rider standing up on the pedals when an arm fails. Could easily result in serious injury.

If you were to elect to retain the arms as a curio the c/w's could be used on other Verot sets with the 122BCD such as 104, 105, etc as well as the 49D inner.

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Last edited by juvela; 03-16-18 at 06:19 PM. Reason: addition
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Old 03-17-18, 09:12 AM
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It turns out there are no helicoils. I guess it's just a trick of the camera. Close inspection in person (as well as the magnet test) reveals no evidence.

I was planning to sell these, but I really try to avoid sending unsafe parts back into the wild, so maybe I'll just polish them up and keep them as art.
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Old 03-17-18, 12:44 PM
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Originally Posted by Andy_K View Post
It turns out there are no helicoils. I guess it's just a trick of the camera. Close inspection in person (as well as the magnet test) reveals no evidence.

I was planning to sell these, but I really try to avoid sending unsafe parts back into the wild, so maybe I'll just polish them up and keep them as art.
-----

You could consider repurposing.

Have seen items like this made into door handles for example.

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