VAST Link Suspension

[Capricorn]

given the location of the lower pivot point on the chainstay, which mimics the pivot location for a horst-link, braking induced squat could be no worse than horst.

[Tumbleweed]

Wait a sec...the linkage between the first drawing and the second are different: down or top tube?

[Captain Fastbastard Mayhem]

Wait a sec...the linkage between the first drawing and the second are different: down or top tube?

150mm vs 118mm. 2nd drawing is assuming a larger range of tear wheel travel.

[Tumbleweed]

Okay, looked at it again...schematic 2 is weird. There's an added link. Kinda negates their single pivot claim, no? Actually, so does their first.

[Captain Fastbastard Mayhem]

Nah. Still a single pivot. It's just a linkage driven shock, but there's only one pivot that the rear "triangle" rotates on.

[nolipoli]

given the location of the lower pivot point on the chainstay, which mimics the pivot location for a horst-link, braking induced squat could be no worse than horst.

I am sure about that. The very short link will be forced to rotate too easily around the rear wheel's axle. In other suspension designs, the rear wheels rotation (and braking action) will be trying to force a more linear movement.

 

It has something to do with torque, moments and lever arms but I can't express it nicely.

[Capricorn]

I am sure about that. The very short link will be forced to rotate too easily around the rear wheel's axle. In other suspension designs, the rear wheels rotation (and braking action) will be trying to force a more linear movement.

 

It has something to do with torque, moments and lever arms but I can't express it nicely.

 

if I understand ABP and Split pivot correctly, those systems are designed to allow the caliper to rotate slightly as its desirable to prevent/minimize brake SQUAT influencing the suspension when the suspension should be responding to the terrain only?

[durbanjacques]

You are also not going to get much of a seatpost into that first frame by the looks of it.

[GoLefty!!]

Hows it different to a PYGA.....?

[bryce123]

I love it! Makes sense, but I can see lateral rigidity issues (but probably not as bad as we might think!)

I wonder why the upward kink in the chain stay. Fewer people would probably be put off by the design if it was straight.

As for brake-jack, as long as it's on the "unsprung chainstay" (as noted in the drawing) it shouldn't be a problem. Even with the brakes fully locked the suspension should remain fully active.

 

 

How do I post a photo???

[bryce123]

Found the attachment button (was on mobile site).

Here's a drawing of a straighter chainstay, doesn't it just look "neater"?

Also, a photo from BikeRadar shows that the shock shouldn't get too much mud.

Not a fan of a split seat tube, but makes sense here somehow.

The idea of a Specialized-style split seat stay could work I suppose, but may shorten shock stroke.

[Dirkitech]

wow, the first frame looks dirty, and not the muddy sort. Anyways, it also looks like an S-Works rip-off. I'm bored of it already.

 

Also this- if the rear shock suspension supresses laterally into the shaft of the top tube, and it bottoms out or you just take a moerse hard tail landing, where does that excess force go? down the fork/front suspension's peehole? Does it lob the frame slightly forward similar to double-jumping on a trampoline?

 

edit 2: can't help but think this frame is going to throw riders off like an angry horse. Guess we shall see.

[Capricorn]

Found the attachment button (was on mobile site).

Here's a drawing of a straighter chainstay, doesn't it just look "neater"?

Also, a photo from BikeRadar shows that the shock shouldn't get too much mud.

Not a fan of a split seat tube, but makes sense here somehow.

The idea of a Specialized-style split seat stay could work I suppose, but may shorten shock stroke. image.jpgimage.jpg

 

looses rearward axle path in initial bit of rear wheel travel if the chainstay is straight. The upsweep is, IMO, a compromise between the desire for rearward locus, shorter chainstays while maintaining a desired amount of travel.

[Captain Fastbastard Mayhem]

looses rearward axle path in initial bit of rear wheel travel if the chainstay is straight. The upweep is, IMO, a compromise between the desire for rearward locus, shorter chainstays while maintaining a desired amount of travel.

 

 

Whoosh.....

 

the sound in various homesteads around south africa. 

[Capricorn]

Whoosh.....

 

the sound in various homesteads around south africa. 

u let rip again?

[Captain Fastbastard Mayhem]

u let rip again?

 

 

BAHAHAHA! That was Pierre, on Monday night... Boy oh boy!