Invest casting stays bridge

PiR products · Feb 22, 2011

Hi,

anyone know where it's possible to find some steel bridges like in the following picture ?

Thank you

Clockwork Bikes · Feb 22, 2011

Those are hydro-formed Al.

PiR products · Feb 22, 2011

Clockwork Bikes said:
Those are hydro-formed Al.

I took this pic from the Flybikes website, and they said "invest casting stays bridge"...

http://www.flybikesbmx.com/frames/products/tierra_info.html

Anyway, is there a way to get this kind of tubes ?

Walt · Feb 22, 2011

Call them

I have never seen anything even vaguely like that in steel. I imagine calling Fly bikes would be step #1 in finding out if you can get some.

FWIW, they look like aluminum to me.

-Walt

PiR products said:
I took this pic from the Flybikes website, and they said "invest casting stays bridge"...

http://www.flybikesbmx.com/frames/products/tierra_info.html

Anyway, is there a way to get this kind of tubes ?

PiR products · Feb 22, 2011

I imagine calling Fly bikes would be step #1 in finding out if you can get some.

I really doubt they'll help me. I already contacted them few years ago concerning a new product idea, but they don't consider ideas that don't come from her company. I know their frames are made in Taiwan, so they probably never had this tube in hand, or maybe the prototype...

crux · Feb 22, 2011

Why not just turn some on a lathe? Design looks simple enough to copy. Start wit ha solid rod profiling the outside as you wish. One satisfied you could bore a hole down the center if your concerned about weight. Just a thought

PiR products · Feb 22, 2011

crux said:
Why not just turn some on a lathe? Design looks simple enough to copy. Start wit ha solid rod profiling the outside as you wish. One satisfied you could bore a hole down the center if your concerned about weight. Just a thought

Yes, but I would like to made a quantity of 50 or more...and I think it's too much time consuming...

Walt · Feb 22, 2011

Um, k...

So have a machine shop do it for you.

-Walt

PiR products said:
Yes, but I would like to made a quantity of 50 or more...and I think it's too much time consuming...

customfab · Feb 22, 2011

The welds on that bike certainly do not look like aluminum to me. The wonderful website for Fly bikes doesn't mention a material spec either.

Fix the Spade · Feb 22, 2011

customfab said:
The wonderful website for Fly bikes doesn't mention a material spec either.

Fly frames are all 4130 of some kind, although they tend to just be listed as CRMO in the catalogues.

I don't know of any non-racing BMX brands that do alu frames. If you're lucky you'll get a name brand and some butted tubes, but mostly they're all about plain gauge steel.

OT:
Ragleys have cast chain stay bridges this year, can't promise Brant will tell you who's making them but it can't hurt to ask him.

pyranha · Feb 22, 2011

Not exactly what is pictured, but very similar in shape. I have never used them, so I can not speak to their dimensions. A phone call to Nova might be in order.

http://www.cycle-frames.com/bicycle-frame-tubing/MACHINED-CHAINSTAY-BRIDGE.html
http://www.cycle-frames.com/bicycle-frame-tubing/INVESTMENT-CAST-PREMITERED-CHAINSTAY-BRIDGE.html

PiR products · Feb 22, 2011

pyranha said:
Not exactly what is pictured, but very similar in shape. I have never used them, so I can not speak to their dimensions. A phone call to Nova might be in order.

http://www.cycle-frames.com/bicycle-frame-tubing/MACHINED-CHAINSTAY-BRIDGE.html
http://www.cycle-frames.com/bicycle-frame-tubing/INVESTMENT-CAST-PREMITERED-CHAINSTAY-BRIDGE.html

Thank you for your help, but I already have both of them and they are terribly small, something like 25 mm long...

Thylacine · Feb 22, 2011

Long Shen is the caster of choice for IC bike parts. If you wanted something like that done, they'd be the people to talk to. They'd sell too, because they're a nice design.

http://www.longshen.com.tw/

Schmitty · Feb 22, 2011

Draw the part, submit to emachineshop.com and be done with it. Getting anything cast will be many thousands of dollars.

-Schmitty-

Cracked Headtube · Feb 23, 2011

OHMYGOD, Schmitty. I never knew of eMachineShop. Thank you for the enlightenment.

davesauvageau · Feb 23, 2011

BMX rider here. Fly frames are dope. They are all Cromo and investment casting is becoming big these days. We The People uses some cast parts too like on the C.R.E.A.M. frame:
http://www.wethepeoplebmx.de/signature-series/cream-frame

http://prollyisnotprobably.com/2011/02/we_the_people_and_investment_c.php

PiR products · Feb 23, 2011

Schmitty said:
Draw the part, submit to emachineshop.com and be done with it. Getting anything cast will be many thousands of dollars.

-Schmitty-

I didn't know this site. The idea behind the site is really good. It's a shame their software is so poor and I talk as a Dassault System (CATIA & SolidWorks) teacher.

Anyway, I made a simulation for 50 pieces and the price is 14 $/bridge and 11 $ for 100 pieces. It's a bit expensive, but could be worst...

Invest casting stays bridge

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