frame

Yeah otherwise there won't be much material contacting the bearing
holders, it's dead easy to ovalise steel tube in a vice, aluminium would
be even easier but may need annealing first to stop it cracking. For
your first frame I would start with steel, aluminium is more prone to
cracking, weaker, much more difficult to weld, and the benefits of it
are few.

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Dave

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oh, so i just need a vice?

cool...

i work at my local hardware store, so i can get a discount on all my
materials... (mostly all, at least...) and my local bike shop might have
extra stuff lying around...

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Cheers,
Mat.
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Consider using 'Krashin'Kenny's Kustom frame design'
(http://tinyurl.com/5zlho). Easier to build than an all welded frame
and it looks good. All you have to do is find an old MTB fork with a
suitable crown.

You can braze the bearing holders on instead of welding. Depends on
whether you know how to weld or braze or know someone who can weld or
braze.

Go with steel. It's easier to work with and more forgiving.

Some info on 'brazing' (http://en.wikipedia.org/wiki/Brazing)

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