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Trek recall MT220
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/Tr...220-girls-bike Frames prone to snapping apparently. |
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#2
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Trek recall MT220
In article , wafflycat
says... 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/Tr...220-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." |
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Trek recall MT220
Rob Morley wrote:
In article , wafflycat says... 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/Tr...220-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) |
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Trek recall MT220
J. Chisholm wrote:
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). 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 http://www.dundee.ac.uk/~pjclinch/ |
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Trek recall MT220
Peter Clinch wrote:
J. Chisholm wrote: 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). 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 |
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Trek recall MT220
J. Chisholm writtificated
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. |
#7
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Trek recall MT220
Quoting J. Chisholm :
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 Distortion Field! Today is First Saturday, February - a weekend. |
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Trek recall MT220
Mark T wrote:
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 -- Posted via NewsDemon.com - Premium Uncensored Newsgroup Service -------http://www.NewsDem |
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