How would this work?

speirmoor

speirmoor

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I saw this bicycle on EBay with a rear suspension that I’d never seen before. Having a look to see how it works I don’t think it’s possible. Am I missing something or would that S shaped frame flex and return on suspension duty ?

2004 3G GGG-S Full Suspension Street Rod Bike, Unique " S" Frame Design Bicycle | eBay

3G Bikes GGG-S Custom Full Suspension Bike. NOS, 2004. Everything from Schwinn Stingrays and Raleigh Choppers to Silver King bikes and Whizzer motorbikes.
www.ebay.com
 

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It looks as though frame flexing is part of the compliance .
I would also say that travel is limited as the rear tire will contact the seat mounting if it flexes too far …
 
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It would be interesting to see some video to see if indeed the frame is flexible enough - and if it is , for how long before fatigue.
Somewhat along the same idea , the Japanese Zero aircraft had various components in the chain of control surfaces that flexed proportionally to the loads on them as airspeed increased in order to limit deflection in order that the pilot would not over control.
It is my understanding that not one aircraft was lost due to fatigue in these components. Jiro Horikoshi , designer of this aircraft among others was a genius.
 
Seems improbable but then torsion bar suspension on cars has been around a long time without any catastrophic issues so who knows ???

Have to agree that any suspension travel would be minimal, probably better off with a swing arm fitted with metalastic bushes
 
Richard Tool said:
It would be interesting to see some video to see if indeed the frame is flexible enough - and if it is , for how long before fatigue.
Somewhat along the same idea , the Japanese Zero aircraft had various components in the chain of control surfaces that flexed proportionally to the loads on them as airspeed increased in order to limit deflection in order that the pilot would not over control.
It is my understanding that not one aircraft was lost due to fatigue in these components. Jiro Horikoshi , designer of this aircraft among others was a genius.
Click to expand...
If it does not flex, it will break. The Mk3 Seeley frame has a ladder in front of the motor. It is in torsion and can break. On my bike, it is a curved piece of gusseted chrome moly tube which provides a slight amount of spring, if the bike is bounced. Popular perception is probably that totally rigid is better. It is like building Tritons - the best motor in the best frame does not necessarily give you the best bike.
 
Frame is not flexing. That is an EXTENSION spring arrangement. (reference harley soft tail)
The swing arm pivots on the crank housing
 
You can't beat the Ariel Pixie and Ariel 3 rear suspension systems - a block of rubber wedged between frame and swinging arm is pure genius!
 
On closer inspection I can’t see a pivot either - 4th photo ( 1st in lower row ) looks like all welded .
???
 
And exactly how is an upwards rotation of the the swing arm about a crank pivot supposed to compress the spring given the geometry in the photos?
 
I agree that it appears to be a fixed arrangement but perhaps the two tabs that are the lower shock mounts actually pivot about the crank and are connected to the swingarm and as the swingarm rotates upward the tabs are rotated and pull on the shock ?
Maybe concours can weigh in on this .
 
May as well just do a full topic change - I saw the coolest bicycle EVER on fecebook.

It has rear wheel steering, and instead of a wheel up front, it has two "walking legs" operated by a standard set of pedals linked to an intermediate crank wheel with articulated arms that control the two "legs" that are jointed.

Just too cool not to like.

(sorry, no photo or video available at this moment, I'm on the road)
 


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