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 Post subject: Re: Bowed top tube
PostPosted: Tue Dec 10, 2019 10:34 am 
Dirt Disciple

Joined: Fri Dec 08, 2017 10:05 am
Posts: 19
[url][URL=http://s44.photobucket.com/user/jamiephillips1972/media/20191207_133252_zpszqn2ftsg.jpg.html]Image[/url][/url]

This is the photo that first made me think there was a curve


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 Post subject: Re: Bowed top tube
PostPosted: Tue Dec 10, 2019 10:37 am 
Dirt Disciple

Joined: Fri Dec 08, 2017 10:05 am
Posts: 19
[url][URL=http://s44.photobucket.com/user/jamiephillips1972/media/20191205_210553_zpsr2yytaqc.jpg.html]Image[/url][/url]

Doesn't look too bad here so will probably live with it. Should look ok after a repaint.


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 Post subject: Re: Bowed top tube
PostPosted: Tue Dec 10, 2019 11:22 am 
Retro Guru

Joined: Tue Aug 21, 2018 3:43 pm
Posts: 808
Location: Cambridgeshire - flatlands (the horror, the horror)
The paint is off in two strategic places - the top tube bow and the down tube - possibly a bend there too since older Mercian paint is quite brittle. I ride a Cannondale with a nasty ding in one seatstay, but take the risk. I would ride a bike with a small dent in the tt, but I am afraid you have a bike with a much more serious issue. Both main tubes have been stressed. I would get both tubes replaced. I regret that in your case the risk total failure of the frame is increased - by how much? Don’t know. But it’s significant damage and while I would ride this to the shops, I wouldn’t ride it down Winnat’s Pass.


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 Post subject: Re:
PostPosted: Tue Dec 10, 2019 11:26 am 
Dirt Disciple

Joined: Fri Dec 08, 2017 10:05 am
Posts: 19
Ok with regards to the paint, I have rubbed it down with sandpaper at these points due to some rust spots.


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 Post subject: Re:
PostPosted: Tue Dec 10, 2019 11:42 am 
Dirt Disciple

Joined: Fri Dec 08, 2017 10:05 am
Posts: 19
Ok so best bet is get it looked at by a professional framebuilder.


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 Post subject: Re: Bowed top tube
PostPosted: Tue Dec 10, 2019 11:50 am 
Retro Guru
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Joined: Thu May 17, 2012 11:04 am
Posts: 944
Location: manchester
could be the result of an accident where the rider ended up sitting on the top tube or someone getting a ride as a passenger, sitting on the tube. unless the tube is kinked anywhere it should be fine strength wise.


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 Post subject: Re: Bowed top tube
PostPosted: Tue Dec 10, 2019 12:07 pm 
Retro Guru

Joined: Tue Aug 21, 2018 3:43 pm
Posts: 808
Location: Cambridgeshire - flatlands (the horror, the horror)
Hmmmm - thanks re rubbing down info - but then why rust spots? Possibly because paint was cracked in those areas? Classic points of bending to a frame from a frontal crash. But it will have slackened the head angle nicely....better on downhills. Obviously the tubes are not grossly kinked, and that’s a good thing. But I certainly would discuss it with a framebuilder....


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 Post subject: Re:
PostPosted: Tue Dec 10, 2019 12:16 pm 
Dirt Disciple

Joined: Fri Dec 08, 2017 10:05 am
Posts: 19
Yeah I get the idea that this bike has been left outside in the elements quite a bit in it's lifetime, hence the many rust spots across the frame. There is no creasing or denting of any kind to suggest a front end crash and the forks are straight. Original fork stamped with same frame number as bb shell.


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 Post subject: Re: Bowed top tube
PostPosted: Tue Dec 10, 2019 12:33 pm 
Retro Guru

Joined: Tue Aug 21, 2018 3:43 pm
Posts: 808
Location: Cambridgeshire - flatlands (the horror, the horror)
That’s interesting....indeed eliminates big front ender, which is good. Possibly an Incident in storage with something heavy coming into contact with tt - maybe weighting it up rather than whanging it....


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 Post subject: Re:
PostPosted: Tue Dec 10, 2019 12:44 pm 
Dirt Disciple

Joined: Fri Dec 08, 2017 10:05 am
Posts: 19
Yeah I suppose that is a possibility. The top tube cable guides aren't squashed or damaged either so if that was the case it would have been in between these.


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