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original_scurrafork.jpg

Here's one of the more 'interesting' products we've seen in a while. This one comes to us from Austria. Would you ride it?

The bike has 180mm travel front and rear, and the fork is integrate into the frame. One of the primary benefits of the design is being able to maintain the headangle throughout the range of travel. The bike has a 29" front wheel and 27.5" out back. The fork and its linkage are made from 7075 aluminum.

Credit
Turman
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6 of 36
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INTERBIKE: Part 2 - Some of the Latest and Greatest for 2014
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44 comments

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zumbi
11 years ago
The guy who is responsible for this project has some serious bills to pay as we produced the front triangles and other parts. Some front frames are still lying around our workshop. The rear suspension is a bad copy of our Zumbi F22 linkage but with a bad shock angle! Beware to work with this company!
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scurra-Martin
11 years ago
Mr. Pawel from Zumbi, please read our Agreement from 17.6.2012 - especially Point 5! You are not able to produce neither frame or front suspension! It was a mistake - we lost with Zumbi 1 year and more than 13.000 EUR! On request we can send correspondence with Zumbi and manufacturing protocol from delivered parts with about 50 faults...
KingDnuts
11 years ago
The only thing i like is the builder thinking of 29" front wheel and 27.5" out back its would be cool to see more. I have always wondered why Dirt bikes have the larger but no bikes
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sproglad
11 years ago
That can't "maintain the head angle". While I understand that it stays parallel, as the fork goes through the travel, the head angle will drop as it does on any other bike,thus changing the head angle.
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CG83
11 years ago
Correct, but since your steering axis and wheel path are independent, you can maintain the trail value, which depending on what you are looking for, is potentially more important than steering axis angle during large compressions
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Lilshredman
11 years ago
I like that double shock set up, that's a very interesting link setup with the fork (if that's what you could call it)
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rugbyred
11 years ago
Just showed this to my wife. Her response was to throw up in her mouth!
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CG83
11 years ago
Its actually not really about wheel path at all. There are a few reasons to explore a linkage on the front of a bike, but the primary one is to be able to tune the anti-dive dynamics in the front end. If you get anti-dive values correct, you have the potential to keep the front suspension completely active under braking, without diving, no matter how deep the braking bumps. The one main problem with this is rider feel, and the sensations that all riders are used to feeling while hitting the brakes into the corner.

In addition, with a design like this, you could easily make a lighter, more stiff front end, due to the limitations of telescoping bearing and sealing systems. Also, some interesting things like the steering axis being independent of the wheel path, keeping consistent geometry/trail during compression and trail values that don't effect steering feel keep these designs interesting.

Whether or not riders accept them is another story, but I certainly believe that the design is much more sophisticated than the average reader of the standard MTB message board would understand. Because of this, spectating the armchair engineering is rather entertaining, in a "I feel sorry for civilization" sort of way.

EDIT - Its also pretty cool how they are utilizing the front and rear shock mounting to centralize and minimize the frame loads due to large bottom out type scenarios.
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Big Bird
11 years ago
Good point on the anti squat properties, I forgot to think of that. I'm just more of a single pivot wheel path kind of guy.
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CG83
11 years ago
Don't forget that every bike, single pivot or linkage, has inherent anti-squat properties! This is why most single pivot bikes (at least the ones without an idler) have the pivot in generally the same location. That is a spot with a good balance of pedaling and wheel path properties. Linkage bikes just have a bit more flexibility in controlling how the anti-squat progresses through the travel.

Also, during breaking, it is "Anti-Dive" as opposed to "Anti-Squat". Glad some people are thinking a bit more critically about the design instead of completely blowing it off!
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Big Bird
11 years ago
When I build my own single pivots (At least on downhill bikes), I put the pivot a little higher than the chain line so that when I stomp on the gas, it pushes the tire into the ground.
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HuckSauce
11 years ago
I was going to joke and say I'd ride it if came in 650b or 29, but I guess it already does.
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Big Bird
11 years ago
I only just noticed that it's two shocks end to end, not both ends sharing the same shock. I'm getting ahead of technology. Maybe they'll pull that one off for next year.
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Joe_Graney
11 years ago
Apro, a taiwanese frame manufacturer and owner of X-Fusion, had an open model that did this a few years back. It was awesome.
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bigpete2112
11 years ago
This was done years ago with the Whyte PRST-1 ........Also don't want to be a pedant but.....it's called aluminium
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Joe_Graney
11 years ago
dear followers of the queen: we had a revolution awhile back, you might have heard of it. during it, we got rid of letters from some of your words, just to screw with you. shortly after that, vital was born to remind you of it.
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wydopen
11 years ago
something similar has been done before..supposed to work really well
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prestondh
11 years ago
awesome concept, but I really doubt this will ever be mainstream

AND

what is the benefit of designing a bike like that, please tell me there is a benefit and that you didn't just make some crazy bike design that doesn't have some added benefit
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Literal.Lee
11 years ago
primary BENEFIT is a constant geometry [head angle & wheelbase], and this is something that telescoping forks will never themselves attain.
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Adam_Schaeffer
11 years ago
Honestly if they had just left the frame as a traditional setup it doesn't look half bad, but that front end.....essh.
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bhalpin47
11 years ago
I would like to see how that front axle path compares to a standard fork. It looks like it would reduce the wheel base more drastically during compression. And look at all of those pivot(read: flex) points they've added to the front end...
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Big Bird
11 years ago
The axle path would be up and back, like a high single pivot in the rear, making it roll over things better. I actually had a similar idea this morning, though not using the same shock, after looking at a picture of an old Honda motorcycle on the can.
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bhalpin47
11 years ago
Would it really provide noticeable advantages to a standard fork though, especially with this added complexity?
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Big Bird
11 years ago
i highly doubt it. The wheel path of a standard fork is about the same and it doesn't look any lighter. The only advantage that I can see is that the wheel path could be made independent of the head angle. And who knows how long that spherical bearing in the head tube will last.
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Dereka15
11 years ago
Who the hell built this and actually thought it was a good idea?