Trek recall MT220

In article <[email hidden]>, wafflycat
w*a*ff£y£cat*@£btco*nn£ect.com says...

Quoted message said:

Apologies if this is already posted (can't see it on my newsreader)

There's a Trek recall of the MT220 girls' bike

http://www.bikebiz.com/news/29388/Trek-recall-MT220-girls-bike

Frames prone to snapping apparently.

"We have informed all Trek dealers to check 2005, 2006 and 2007 Mt 220
Girl models. The issue with the affected frames was that a gusset was
missing from the head tube to down tube junction."
....
"If there is a gusset then there is no problem with the frame."

Rob Morley said:

In article <[email hidden]>, wafflycat
w*a*ff£y£cat*@£btco*nn£ect.com says...

Quoted message said:

Apologies if this is already posted (can't see it on my newsreader)

There's a Trek recall of the MT220 girls' bike

http://www.bikebiz.com/news/29388/Trek-recall-MT220-girls-bike

Frames prone to snapping apparently.

"We have informed all Trek dealers to check 2005, 2006 and 2007 Mt 220
Girl models. The issue with the affected frames was that a gusset was
missing from the head tube to down tube junction."
...
"If there is a gusset then there is no problem with the frame."

I though all Ally frames snapped eventually (but long after the
Carbon Fibre ones were in a heap)

Jim Chisholm
(whose Ally handle bars failed dramatically)

J. Chisholm said:

I though all Ally frames snapped eventually (but long after the
Carbon Fibre ones were in a heap)

Give /anything/ enough use and it will eventually snap. No particular
reason an Al frame should fail before the useful life of the bike has
expired (i.e., all the other bits are in such a state that it's cheaper
to just get a new bike than replace them all).

Quoted message said:

Jim Chisholm
(whose Ally handle bars failed dramatically)

Only /major/ structural failure I've had so far was a steel frame.
Nothing's perfect, and with welding some things that should be the same
are less perfect than others.

Pete.
--
Peter Clinch Medical Physics IT Officer
Tel 44 1382 660111 ext. 33637 Univ. of Dundee, Ninewells Hospital
Fax 44 1382 640177 Dundee DD1 9SY Scotland UK
net [email hidden] http://www.dundee.ac.uk/~pjclinch/

Peter Clinch said:

J. Chisholm said:

I though all Ally frames snapped eventually (but long after the
Carbon Fibre ones were in a heap)

Give /anything/ enough use and it will eventually snap. No particular
reason an Al frame should fail before the useful life of the bike has
expired (i.e., all the other bits are in such a state that it's cheaper
to just get a new bike than replace them all).

Quoted message said:

Jim Chisholm
(whose Ally handle bars failed dramatically)

Only /major/ structural failure I've had so far was a steel frame.
Nothing's perfect, and with welding some things that should be the same
are less perfect than others.

Pete.

One of the reasons that steel is the best frame material is that it has
a fatige limit, below which no amount of cycling will cause it to break.
As far as I know Titanium is the only other metal to have this property.

The major failures that I've had are two sets of Al handlebars and
errr... one steel frame.

The gaps between theory, practice and cheap bike parts.

Roger Thorpe

J. Chisholm writtificated

Quoted message said:

I though all Ally frames snapped eventually (but long after the
Carbon Fibre ones were in a heap)

I'd expect carbon fibre to last for years - I was riding around on 10 year
old carbon until it got nicked.

I'm surprised that lack of a gusset prompted a recall - I thought they were
only needed on the more hardcore mountain bikes, or maybe I'm
underestimating the enthusiasm and prowess of small children for drop offs
and jumps.

Quoting J. Chisholm <[email hidden]>:

Quoted message said:

I though all Ally frames snapped eventually (but long after the
Carbon Fibre ones were in a heap)

Eventually, yes, it's inevitable, in a way that is not inevitable with a
steel frame. However, it's not clear that the expected life of a
well-engineered Al frame is less than the expected life of a rider or the
expected time before rust carries off the average steel frame.
--
David Damerell <[email hidden]> Distortion Field!
Today is First Saturday, February - a weekend.

Mark T said:

I'm surprised that lack of a gusset prompted a recall - I thought they were
only needed on the more hardcore mountain bikes, or maybe I'm
underestimating the enthusiasm and prowess of small children for drop offs
and jumps.

The frames in question all have a short head tube and a single, combined
top and down tube. This means that the joint is subject to bending loads
trying to pull the weld apart at the bottom.

The gusset (which may well be of much thicker steel than the tubes)
helps to transfer the load into the down tube.

--
Andy Morris

AndyAtjinkasDotfreeserve.co.uk

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