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Framebuilders Thinking about a custom frame? Lugged vs Fillet Brazed. Different Frame materials? Newvex or Pacenti Lugs? why get a custom Road, Mountain, or Track Frame? Got a question about framebuilding? Lets discuss framebuilding at it's finest.

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Old 01-06-10, 10:15 AM   #1
engo
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wishbone seatstays-pros & cons?

Hi all,
I'm interested in building my own frame one day, but for now, while I practice brazing, I'm just looking at design elements and trying to figure out what I want in a frame.
On that note, I've seen a few bikes (though not many) with wishbone seatstays. This feature is more common with new bikes in carbon, or with carbon elements, but I really like the look on a steel frame.
Are there unique and desirable ride characteristics offered by a wishbone seatstay, or is it more flash than substance?
Thanks,
Neil
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Old 01-06-10, 03:37 PM   #2
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I don't really find them attractive, but I respect the fact that other people do. I suspect they add quite a bit of weight and (undesirable) stiffness depending on how they are done. I have a wishbone fitting that is a lot like a fork crown. Not sure what blades were supposed to go with it, the blade sockets are fairly large.
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Old 01-06-10, 04:28 PM   #3
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I'm not sure it is called the same thing, but it was comon on MTBs in the 80's? Nishiki did a lot of them. They have the advantage for certain bikes to allow stays (top or bottom) to be unlimited in length. They also look easier to fit it reducing the fit to a bunch of end on butts, that can be cut on a mill or straight from a miter program, or are square. Something like th Strawberry casting does look heavy to me, but I have not handled one.

As far as reducing the difficulty of making the joint at the seat, you can use Bontraged stays which are a slip fit (5/8" .058" wall over 1/2") (allows the stay to extend like an antenna) to allow you to work up to either end without cutting the stay too short. And if your design does not allow those stays, you can still use the basic idea to make a pattern. A bit of a a round about, but easy on the nerves the first few times out.
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Old 01-06-10, 07:29 PM   #4
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Sometimes they look pretty good (see below), but I still prefer the look of the two full-length stays. I'd think the longer stays would also give a little more flex, and be more comfortable on longer rides. But remember, if the frame is for you, do it however makes you happy.

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Old 01-06-10, 11:19 PM   #5
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A good reason to post a picture of my new bike.

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Old 01-07-10, 12:42 AM   #6
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Triangles in structures are good things. A person contemplating their removal should write himself out an explanation -- longhand and triplicate -- as to why it is necessary. Wishbone seatstays are a bad idea and exist for no reasons other than fashion and sales hooks. IMO, of course...
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Old 01-07-10, 01:46 PM   #7
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Thanks Aaron! (the pink bike is one of mine)

Followed a link from the picture back to this thread. I like the stiffness for track bikes, and with the right stays/ application I build with them in a variety of frames for all disciplines.

Here is another fun one I did.



More on my site (and flikr account) WinterBicycles.com
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Old 01-07-10, 05:29 PM   #8
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Eric, I think I spent most of Christmas day ignoring my family and looking through your photostream. Speed Metal is awesome.
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Old 01-08-10, 08:35 AM   #9
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Thanks for the replys all. I guess the wishbone stay adds stiffness to the frame then. Eric: do you find the construction more difficult, or just different?

PS. I agree: beautiful frames!

Last edited by engo; 01-08-10 at 08:59 AM. Reason: praise
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Old 01-08-10, 10:57 AM   #10
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Just different. There is a lot going on with seat stays, be they side tack, wish bone, fast back or some variation.

Last edited by Eric Estlund; 01-08-10 at 11:08 AM.
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Old 01-11-10, 10:26 AM   #11
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Cool, thanks for the input...and for the eye-candy!

Neil
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