Mine is orange and it, too, has such a gap between the lug and
downtube.  Actually, it looks like a flaw in the brazing.  I filled it
with clear nail polish to keep it from collecting water and
corroding.  The paint job on this bike is very thin, so that the edges
of the lugs are darker because of less paint, and some areas are
darker than others, presumably where the paint is thinner.  I got this
bike used and it rides well, but had I purchased it new for full
price, I would have returned it.  I have a Hilsen with a nice paint
job and there is no comparison.  The paint on the QB is not great
advertising for Riv bikes.

On Jul 15, 12:10 pm, Esteban <[email protected]> wrote:
> My QB (orange - got it used) has a little paint gap in between the lug
> and downtube -- it looks like a paint imperfection to me and I've
> never worried about it.  I'll post a photo if I get around to it.
>
> Esteban
> San Diego, Calif.
>
> On Jul 15, 8:10 am, Jim Thill - Hiawatha Cyclery <[email protected]>
> wrote:
>
>
>
> > I've seen frames crack there, even when they haven't been crashed. Any
> > lug area can be overheated and weakened during brazing if the person
> > doing the brazing isn't careful. The lug-edge is a stress riser, and
> > if the metal is brittle from overheating, it may not take much out-of-
> > the-ordinary stress (heavier rider, bumpy roads, riding off a curb,
> > etc) to start some cracks forming. Often these cracked frames are
> > ridden for 20+ years before the problem becomes obvious, but it would
> > make me nervous every time I went for a ride.
>
> > On Jul 14, 7:16 pm, Kelly <[email protected]> wrote:
>
> > > I bought my new Quickbeam several weeks ago and I love it.  However,
> > > while building it up I noticed a few hairline cracks in the paint
> > > under the top head lug.  This is weird, as the rest of the bike is in
> > > perfect condition.  The cracks are raised from the surface of the
> > > paint and are like little ridges.  So the question, should I be
> > > worried?
>
> > > Here is a pic:
>
> > >http://tiny.cc/CCrye
>
> > > or here:
>
> > >http://www.flickr.com/photos/31296...@n07/3722235822/in/set-721576196...
>
> > > You can also see some other pictures of the completed bike.
>
> > > Thanks, Kelly.
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