Technical & Reference Section > Tech and Restoration
OG fatgoose 170 update
snoopy72:
I think your right, it feels the weakest under a bit of load but I haven't really forced it because I don't want to twist it out of shape, at the moment it springs back.
I was originally worried about the crankshaft, no chance of that breaking
oldschoolace:
If the expanding foam idea proved usefull you could drill little "weep" holes to inject it in. :)
snoopy72:
--- Quote from: rodriguez on June 02, 2014, 09:48 PM ---I think it'll crack where the bb meets the box the way it is under heavy load, in my opinion that's the area pedaling will stress most as power is transferred to the rear wheel via the cranks.
I'd consider increasing the size of the box.
As it would reduce the bb flexing I think this might actually reduce the stress on where the down tube and seat tube meet the bb.
Might increase the stress where the down tube meets the head tube though.
Any structural engineers on here?
--- End quote ---
The headstock on a mongoose is pretty strong with the gusset, not known a mongoose to break there.
I've known one snap at the top of the seat mast tube but that could have been caused by the seat post not in far enough. all in all mongoose did make a strong frame but can it handle my modifications ? It will certainly be a test for it
Skip Hess would probably say "nono" your going to hurt yourself you :bellend:
Gnarlyscoots:
--- Quote from: rodriguez on June 02, 2014, 09:48 PM ---
I'd consider increasing the size of the box.
--- End quote ---
You boasting again ;D Most of us would prefer to see a smaller box but, in this case of requiring a bigger box for the extra stiffness gained, I would have to agree :D
snoopy72:
--- Quote from: Gnarlyscoots™ on June 02, 2014, 10:16 PM ---
--- Quote from: rodriguez on June 02, 2014, 09:48 PM ---
I'd consider increasing the size of the box.
--- End quote ---
You boasting again ;D Most of us would prefer to see a smaller box but, in this case of requiring a bigger box for the extra stiffness gained, I would have to agree :D
--- End quote ---
I agree the box needs to be wider, got to be careful not to go too wide as this will in turn move the stress to the bottom stay tubes, then brace the top and bottom stays together, this moves the stress to the top stay where it meets the triangle, brace this and the top of the seat mast and the stress now moves to the bottom of the seat mast, brace this then it moves to the base of the down tube, brace this then it moves to the headstock, brace this more and now it makes the forks weak , brace these and now I have a bike that looks and feels as heavy as an Austin Allegro.
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