Beat The Clock

Re: 360 bobber/Brat new tires update

Hey Jay, Thanks for the kind words. That is a different calculator than the one I have. It might even be a tad friendlier. So thanks for posting it. Yeah, I'm just in love with the Goldammer bike, but it is love/hate for me. Its so sweet, but I hate the fact that the forks probably aren't dampened and maybe even could be solid :(. easy fixes though. It is just so sweet! Thanks again for the props.

Swagger said:
gobbing up your thread...? Dude....it's your thread!
Click to expand...
Thanks Swagger ;)
 
Re: 360 bobber/Brat new tires update

man, there's definitely an articulation point in this fork bro....its just so clean it's hard to see...I'm pouting over the image to try and figure out their damping mechanism though....WTF???!

That's a sexy front end.

I'm sure you noticed this, but here's where it articulates...just like a standard girder...crazy!:

dsc0047412.jpg
 
Re: 360 bobber/Brat new tires update

I don't see any spring either. Maybe there is some kind of torsion spring or torsion bar in that rear lower articulation point. Seems kind of bulky compared to the rest.
 
Re: 360 bobber/Brat new tires update

i would bet it is a twist tension spring... much like some self closing doors have
 
Re: 360 bobber/Brat new tires update

JRK5892 said:
i would bet it is a twist tension spring... much like some self closing doors have
Click to expand...
Joe that is exactly what I first thought. What made me think that it might be "just for looks" is not knowing if a spring was in there somewhere. If not, the damn thing would just flop unless the pivot points were just for looks and it was really solid. don't know what the point in that would be though.
 
Re: 360 bobber/Brat new tires update

It has to be an internal dampening spring. Ive installed doors at work that weigh 150+ lbs and are closed by one spring in one hinge. They can be very tiny and still quite powerful. Tons of custom fab would be needed of course.
 
Re: 360 bobber/Brat new tires update

I was thinking the same thing as Joe, I've seen torsion springs on trailers axles where the wheels are independent of each other. Could be something like this but for the amount of space that's there the springs couldn't be that stiff.
torsion_graphic_2(47ds42).gif


The red Goldammer bike looks likes its a hard tail but really it's a mono-shock that is located under the tank so you know he's into to fancy shock trickery.

so you know what I mean
goldammer-btr3.jpg_lg.jpg


and here's the trick
1.jpg_lg.jpg


Jay
 
Re: 360 bobber/Brat new tires update

Wow...!!! that is sweet. Talk about fabrication.
thanks for posting that info guys. Looks like it can be done but just wow!
 
Re: 360 bobber/Brat new tires update

I think those are simple assembly points rather than actual articulation. I'll know in a bit though, I shot off an email to ask. I've chatted with him on another occasion and he was pretty willing to do so....
 
Re: 360 bobber/Brat new tires update

Jay: Those are some great pics! I've been scratching away at a swing arm for one of my bikes and wanted to do a hard tail look, that pretty much justifies (for me at least) all the time I've put into it in solid works....

Troy: Here's a pretty spiffy girder front end, don't have any info on it other than it's a japanese custom
webj.jpg
 
Re: 360 bobber/Brat new tires update

Swagger, That is the one I've been looking for! Everything is nice and tight, kinda low slung. It has the bicycle trees that I really like. Simple yet elegant. Can't tell from the photos but the upper link looks shorter than the lower?? not good. Looks like there is little rake on the head tube. anyway, i love the design and that is what I'm looking for.
What an interesting bike. That back end is a four link?? Pretty sweet. Love the skinny tires. Looks like 19s or 21s and maybe a front tire is mounted on the back. that's not good too but I love the look. Very cool!
Thank you for posting this.

I'd love to see what ideas you have for for the SA??
 
Re: 360 bobber/Brat new tires update

Swagger said:
Jay: Those are some great pics! I've been scratching away at a swing arm for one of my bikes and wanted to do a hard tail look, that pretty much justifies (for me at least) all the time I've put into it in solid works....

Troy: Here's a pretty spiffy girder front end, don't have any info on it other than it's a japanese custom
webj.jpg
Click to expand...

That is an extremely well-executed front end! Nice find.

--Chris
 
Re: 360 bobber/Brat new tires update

Swagger: I love solidworks for rocking up concepts with articulation. Mostly I use it for designing electric fireplaces at work. LOL. My stuff can be seen at Home Depot and for Us up here in the north, Canadian Tire.
As far as hidden sprung hardtails, I saw a concept that used half a leaf spring placed vertically and I think it was hidden behind a horseshoe shaped oil tank. If I find those pics I'll post them.

And that is one good looking board tracker. I've got an 8hp Briggs and Stratton engine I've been thinking about using for the power plant on a board track replica. or the spare sr250 engine that was run over by a transport earlier this year.

Jay
 
Re: 360 bobber/Brat new tires update

Swagger: here's that leaf spring swing arm I was talking about, sorry but this is the only pic I have of it. came from a Barnetts magazine

Jay
 
Re: 360 bobber/Brat new tires update

Swagger said:
That's pretty smooth! I wonder if it's damped?
Click to expand...

I don't think so. Seems like it's just the leaf spring similiar to how a front end with half a leaf spring would be

P1000831%20sm.jpg


Jay
 
Re: 360 bobber/Brat new tires update

I'll stop thread jacking now, here's another option of a girder using Chevy valve springs

caballero+005.jpg


another angle
Slims+Bikes+frt.JPG


Held together with wingnuts and safetywire.

Jay
 
Re: 360 bobber/Brat new tires update

Hey Jay, Thanks for posting that stuff. No hijack at all, so please keep on posting. The chevy valve springs girder didn't load. Would you mind trying to post it again. I'd love to see it. And the mono leaf rear you posted has to be pretty stiff just by lookng at the fender/seat clearance. Cool stuff bud.
 
Re: 360 bobber/Brat new tires update

Im not keen at all on the flat bar linkages on that front end, BUT, I have to say, that is one brilliantly designed front end geometrically...If you took that designed and built it using more substantial work and parts, it would be a very awesome way to do it. Nice find. That actually gets my gears turning.
 
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