Technical & Reference Section > Tech and Restoration

OG fatgoose 170 update

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snoopy72:

--- Quote from: Gnarlyscoots™ on June 01, 2014, 09:45 PM ---To be honest, you will find those alloy cranks flex a lot too.

--- End quote ---
Yes Terry, they are also flexing

snoopy72:
I have contacted a couple of well known frame builders to get an opinion, see what they say, If  I brace the area in question it could also transport the problem to the top tube where it joins the seat post mast, I had a mitygoose that snapped here years ago.

oldtired:
 :4_17_5:  love this project ,


could you not just fatten up the chain stay box?  making it wider, could be added to  rather than removing the existing one,  don't think it would spoil the looks as the rear end is so wide already , weld on the top join could be ground in so it looks like one box section , would have thought i would be stiff enough to stop the displacement transfer to the top/seat tube weld?

 looks to be about 80% of the bb width is covered by the chain stay box on a goose so perhaps it needs to be similar proportion on this , the gussets are a good idea but i think would detract from the distinctive goose chain stay bridge ?  :-\   

 this  may cause issues with the bottom tube  , twisting under load  at the bb?  :-\

snoopy72:
Thanks for all your thoughts and ideas, yes the flex feels to be at the rectangle tube , maybe if I enlarge the rectangle not to the full 80% as not to put the stresses towards the seat mast and down tubes.
What about enlarging the stay bridge and then fitting a 76 gusset between the down tube and seat mast to affectively join them together?
It would be interesting to know why mongoose fitted this gusset to the 75 and 76 and then removed it ?

snoopy72:

--- Quote from: oldtired on June 02, 2014, 10:01 AM --- :4_17_5:  love this project ,


--- End quote ---
I'm not feeling the love at the moment  :LolLolLolLol:

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