All this talk about installing disk brakes makes me grateful to own a
1998 Y22 already set up w/ the mount. Check it out boys and weep! LOL

http://sports.ph.groups.yahoo.com/group/trekybikes/photos/view/af1a?
b=1

I can't wait to get a set of disk brakes... happy riding for 2008
trekkers!


--- In trekybikes@yahoogroups.com, "Neil Bolton" <n.bolton@...> wrote:
>
> Fair enough - I ran a Muddy Fox DH frame, for which we knew there
was a
> known weak spot in the rear triangle - I worked for Westland
Helicoptors
> at the time, and asked the boffins there to add angles to the
swingarm,
> re-heat-treat it correctly (it came un-heattreated from the
factory -
> Taiwanese quality eh!!!) and then paint it.
>
>
>
> Worked a treat, and was incredibly strong - Muddy Fox even
incorporating
> it into their next design (cheap at the price of some biscuits).
>
>
>
> Trouble was: I snapped the headtube off the frame some time after
> instead...
>
>
>
> It may never break, if what your friend says, however, you can
never be
> too careful :-)
>
>
>
> Good luck...!
>
>
>
> ________________________________
>
> From: trekybikes@yahoogroups.com
[mailto:trekybikes@yahoogroups.com] On
> Behalf Of Mark Huppertz
> Sent: 25 March 2008 14:55
> To: trekybikes@yahoogroups.com
> Subject: RE: [trekybikes] Re: Hayes Disc Brakes on a Y-22 (photos)
>
>
>
> Cool bit drilling through heat treated material is fine.
>
> My machinist friend designs and builds amazingly complex equipment
for
> the military and mining industries. He worked up the swingarm as a
model
> and then put it under stress with his finite element analysis (FEA)
> software and determined that the holes would not weaken the
structure
> appreciably. In fact it will break in the junction area first, down
by
> the bottom bracket, where my other arm kept breaking.
>
> I did my homework, but the proof is in the pudding right?
>
> Mark
>
>
>
>
>
> From: trekybikes@yahoogroups.com
[mailto:trekybikes@yahoogroups.com] On
> Behalf Of Neil Bolton
> Sent: Tuesday, March 25, 2008 8:40 AM
> To: trekybikes@yahoogroups.com
> Subject: RE: [trekybikes] Re: Hayes Disc Brakes on a Y-22 (photos)
>
>
>
> I can see a problem here.
>
>
>
> Any heat treatment causes a material to become more susceptible to
being
> fragile.
>
>
>
> I hope you drilled the holes slowly, with lots of cutting fluid to
cool
> the bit.
>
>
>
> My point: Any invasive alteration to a heat treated metal*
(including
> drilling) weakens it. Simple ABC of engineering I would have
thought?
>
>
>
> *Also, worthy of note, 6061 aluminium (as the Trek uses) is more
> sensitive to heat treatment.
>
>
>
> ________________________________
>
> From: trekybikes@yahoogroups.com
[mailto:trekybikes@yahoogroups.com] On
> Behalf Of Mark Huppertz
> Sent: 25 March 2008 14:27
> To: trekybikes@yahoogroups.com
> Subject: RE: [trekybikes] Re: Hayes Disc Brakes on a Y-22 (photos)
>
>
>
> The swing arm is heat treated. Welding on it causes weak spots that
> crack. I tried to repair my last one several times that way.
>
>
>
> From: trekybikes@yahoogroups.com
[mailto:trekybikes@yahoogroups.com] On
> Behalf Of Pete
> Sent: Tuesday, March 25, 2008 5:20 AM
> To: trekybikes@yahoogroups.com
> Subject: [trekybikes] Re: Hayes Disc Brakes on a Y-22 (photos)
>
>
>
> I feel I have to ask: Why the decision to bolt it through the
swingarm
> rather than weld it on?
>
> --- In trekybikes@yahoogroups.com <mailto:trekybikes%
40yahoogroups.com>
> , "Neil Bolton" <n.bolton@> wrote:
> >
> > Neat as that does look, I can't see many people (if at all) being
> > willing to drill holes in their irreplaceable rear swingarms.
> >
> >
> >
> > I really don't sit comfortably with the idea of drilling through a
> > swingarm - failures don't happen quickly - they happen after a
season
> of
> > riding. Additionally, its not the vertical stresses you have to
> > consider, it's the side forces, i.e. flex as the bike twists -
that'll
> > kill a swingarm quicker than up and down forces; and that's where
I'd
> > expect stress fractures from the drilled holes.
> >
> >
> >
> > I'd be checking very carefully and frequently - it doesn't matter
how
> > many calculations you do, you can still have failures - look at
the
> > amount of frames that are supposedly well designed that just
fail; and
> > that's just 'normal' frames! I've seen too many home brewed
designs
> fail
> > to say you've got something that wont eventually fail.
> >
> >
> >
> >
> >
> > But kudos for trying :-) my only suggestion would be you would
want to
> > design a non invasive bracket if you want others to take any
interest.
> >
> >
> >
> > Neil (critical bugger).
> >
> >
> >
> >
> >
> >
> >
> > ________________________________
> >
> > From: trekybikes@yahoogroups.com <mailto:trekybikes%
40yahoogroups.com>
> [mailto:trekybikes@yahoogroups.com <mailto:trekybikes%
40yahoogroups.com>
> ] On
> > Behalf Of Mark Huppertz
> > Sent: 24 March 2008 22:00
> > To: trekybikes@yahoogroups.com <mailto:trekybikes%
40yahoogroups.com>
> > Subject: RE: [trekybikes] Re: Hayes Disc Brakes on a Y-22 (photos)
> >
> >
> >
> > They go through. We did a quick stress analysis and found the
stress
> of
> > the frame in that area travels along the outside top and bottom
edges,
> > so the impact is very minimal. Also, the clamping force of the
bracket
> > actually adds strength to that area.
> >
> > I rode it hard yesterday and it worked flawlessly, with zero
> measurable
> > deformation. My bracket is definitely overkill though.....
> >
> > Mark
> >
> >
> >
> > ________________________________
> >
> > From: trekybikes@yahoogroups.com <mailto:trekybikes%
40yahoogroups.com>
> on behalf of Bill Gibson
> > Sent: Mon 3/24/2008 2:42 PM
> > To: trekybikes@yahoogroups.com <mailto:trekybikes%
40yahoogroups.com>
> > Subject: [trekybikes] Re: Hayes Disc Brakes on a Y-22 (photos)
> >
> > Nice work. Do the bolts on the side of your disc brake mount go
thru
> > the frame or do they more or less clamp against the frame?
> >
> > -Bill
> >
> > --- In trekybikes@yahoogroups.com
> <mailto:trekybikes%40yahoogroups.com>
> <mailto:trekybikes%40yahoogroups.com>
> > , "mjhuppertz" <mhuppertz@> wrote:
> > >
> > > http://s112.photobucket.com/albums/n192/mhuppertz/?
> <http://s112.photobucket.com/albums/n192/mhuppertz/?>
> > <http://s112.photobucket.com/albums/n192/mhuppertz/?
> <http://s112.photobucket.com/albums/n192/mhuppertz/?> >
> > > action=view&current=P3221526small.jpg
> > >
> > > http://s112.photobucket.com/albums/n192/mhuppertz/?
> <http://s112.photobucket.com/albums/n192/mhuppertz/?>
> > <http://s112.photobucket.com/albums/n192/mhuppertz/?
> <http://s112.photobucket.com/albums/n192/mhuppertz/?> >
> > > action=view&current=P3221525small.jpg
> > >
> > > http://s112.photobucket.com/albums/n192/mhuppertz/?
> <http://s112.photobucket.com/albums/n192/mhuppertz/?>
> > <http://s112.photobucket.com/albums/n192/mhuppertz/?
> <http://s112.photobucket.com/albums/n192/mhuppertz/?> >
> > > action=view&current=P3221522small-1.jpg
> > >
> >
> >
> >
> >
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Attachments to this e-mail may contain software viruses which could
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