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PostPosted: Mon Aug 15, 2011 10:53 am 
retrobike rider / Gold Trader
retrobike rider / Gold Trader
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Location: The desolate flats of Cambridgeshire
cyfa2809 wrote:
MikeD wrote:
Quote:
but any tube with an id of 1"1/8th would do.


Um. 1-1/8th is the OD of the steerer tube, not the ID of the head tube. The OD of the headset cups for a 1-1/8th headset is 34mm.


Wouldnt that vary by manufacturer?


No, otherwise there would be a lot of sloppy headset fits out there.


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PostPosted: Mon Aug 15, 2011 11:09 am 
Gold Trader / rb Rider / Special
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I mean the thickness of the tubes
i.e. the outer diameter can vary?


Reynolds do some stainless tubing i think, 953 is it? Expensive


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PostPosted: Mon Aug 15, 2011 12:43 pm 
Retro Guru
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02gf74 wrote:
I cannot think of any bike frame made in stainless so there may be a clue as to why that is not a good choice. :?

from my limited knowlwdge, stainless is more brittle than mild steel hence maybe the reason why - you would presumably be using a tubing that is some fancy steel alloy since these are engineered for bike frame puposes - i..e have thin walls and correct properties, unless you want your bike to weigh a ton. .... but for downhill that is not so important (but remeber you still need to get it somehow to the top of the hill)

As mentioned, the time consuming part will be the jig so that the frame rides true and you'll probalby need to practise not only your weldig but maybe make a couple of frames on cheaper steel tubes first.

Makes sure you post photos of your progress :)


http://reynoldstechnology.biz/our_materials_953.php

I wonder if it can be left bare / untreated ? 8)

WD :D


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PostPosted: Mon Aug 15, 2011 2:23 pm 
Old School Grand Master
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^^^ that is link to some stainless steel tubing; still not aware of any bikes being made from stainless, not to say there aren't any, just I don't know of any.


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PostPosted: Mon Aug 15, 2011 3:07 pm 
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02gf74 wrote:
^^^ that is link to some stainless steel tubing; still not aware of any bikes being made from stainless, not to say there aren't any, just I don't know of any.


Clicky here :wink:

And Independant Fabrication, Roberts.


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PostPosted: Mon Aug 15, 2011 4:53 pm 
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Quote:
I mean the thickness of the tubes
i.e. the outer diameter can vary?


Yes, but the critical dimension is the ID, so a headset will fit in it.


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PostPosted: Mon Aug 15, 2011 5:43 pm 
retrobike rider / Gold Trader
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Sounds like a lot of work to me. I can understand wanting to build a hardtail from scratch, but a DH bike ( i'm presuming you are building full suss?). Lots of machining work for pivots and rockers etc. You will certainly need more than a frame building jig for sure.


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PostPosted: Mon Aug 15, 2011 7:07 pm 
Gold Trader / rb Rider / Special
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Dr S wrote:
Sounds like a lot of work to me. I can understand wanting to build a hardtail from scratch, but a DH bike ( i'm presuming you are building full suss?). Lots of machining work for pivots and rockers etc. You will certainly need more than a frame building jig for sure.


Thats right, maybe you should get hold of something like solidworks or similar to have ago in a virtual world first


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