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Stainless Steel for stick bike

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SimRichards View Drop Down
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    Posted: 14 June 2019 at 6:07pm
Hi, I'm making a Burrows style highracer  stick bike for commuting and want a 2" stainless tube with sufficient strength. Anyone had experience of building recumbents in stainless? What grade and wall thickness would you use?  I plan to fillet braze. Weight is not important!  Many thanks
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GeoffBird Quote  Post ReplyReply Direct Link To This Post Posted: 15 June 2019 at 12:33pm
Hi, I assume by 'stick bike' you mean a recumbent with one straight tube for the main frame? I've made bikes like this with dia. 50mm x 1mm wall CFS and 2" x 20 swg T45 and it is plenty stiff and strong enough. Admittedly stainless is more brittle but you might struggle to find 50 mm in less than 1.5 mm wall anyway and I would think that plenty strong enough! 316 is stronger than 304.

Geoff Booker makes upright trikes in exotic stainless - fillet brazed, dressed back smooth and polished and they look beautiful!

My experience of having stainless brazed in the past is that you need to use the right flux.


Edited by GeoffBird - 15 June 2019 at 12:37pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SimRichards Quote  Post ReplyReply Direct Link To This Post Posted: 17 June 2019 at 11:32am
Many thanks Geoff. Yes, by stick  I mean one tube from the front to the back, think Ratcatcher but with a big front wheel. 
I had thought of T45 but my design demands an opening at the front and rear of the main tube for the cables to go inside  and I was worried about water pooling and eventually going rusty - hence the stainless option.
I've been in touch with Dan at Moulton Bicycles re flux and braze and he's been very helpful. Thanks for the tip about Geoff Booker too. Ping Ping!  Sim
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Kacey Quote  Post ReplyReply Direct Link To This Post Posted: 25 June 2019 at 12:17pm
5

Hello,

I see you wish to build a stick bike(bent) in stainless.

If you do need any mandrel bends, Pipewerx, based in Lancashire, makes a good selection of diameters & radiuses, in 1.2 & 1.5 mm wall thicknesses,in 304 grade & available online. Usual disclaimers!

I've built 2 recumbents using their bends, joined with carbon fiber tubes, bonded with Locktite 9466.

Kaycey
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SimRichards Quote  Post ReplyReply Direct Link To This Post Posted: 26 June 2019 at 5:47pm
Many thanks Kaycey, this will be a totally straight bike. Long legs = no need to bend the frame to make it easier to get on and off. Thanks for the tip though.


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Kacey Quote  Post ReplyReply Direct Link To This Post Posted: 26 June 2019 at 7:28pm
Lower is quicker though....
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GeoffBird Quote  Post ReplyReply Direct Link To This Post Posted: 27 June 2019 at 10:19am
Hi Keith - your bike sounds interesting - can you post pictures here please?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ChrisH Quote  Post ReplyReply Direct Link To This Post Posted: 27 June 2019 at 11:20pm
On the subject of Keiths,

Are you the Keith with the homemade recumbent I parked up next to at the Cycle Snetterton Race track eve a few weeks ago. (I was wearing a Raptobike at the time)?

Chris 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Kacey Quote  Post ReplyReply Direct Link To This Post Posted: 28 June 2019 at 4:37pm
Hello Chris,

Yes, I'm the one you parked next to. I was getting over the flu, so I didn't hang around very long, I'm afraid.

Keith
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GeoffBird Quote  Post ReplyReply Direct Link To This Post Posted: 28 June 2019 at 4:54pm
Following Keith's link lead me to this company that does dia. 50 mm x 1.2 mm 304 stainless tube - a bit lighter than the more normal 1.5 mm wall. They also do 1 3/4" x 1 mm.

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