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Old 08-03-09, 08:10 AM   #1
ChainlessRev
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"The Contortionist" - New folding mountain bike design

At first glance, I thought it was an earlier prototype of Mark Sander's IF Mode but it's actually another "full size" folding bike.

It looks pretty nice & simple.

Too bad they don't any more pictures.

http://www.thelondonpaper.com/thelon...ed-on-the-tube



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Old 08-03-09, 10:06 AM   #2
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That's a fresh new design. and if he's able to sell at 400 pounds then you have a winner on your hands. Only problem is the 26 inch wheels are kinda big to bring anywhere. If he's not able to keep that low price then you'll just have another IFmode on your hands.
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Old 08-03-09, 10:46 AM   #3
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it has a chain ? brakes ?
its one thing to come up with a proto without being constrained by small details like brake or drivetrain ...lol
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Old 08-03-09, 10:57 AM   #4
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How do you adjust seat height? Is it just an incomplete prototype for demo purposes?
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Old 08-03-09, 11:00 AM   #5
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How do you adjust seat height? Is it just an incomplete prototype for demo purposes?
as you can see from the pic i think this is just an incomplete proto. no chain, no seat adjustment, no RD, etc...
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Old 08-03-09, 11:15 AM   #6
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as you can see from the pic i think this is just an incomplete proto. no chain, no seat adjustment, no RD, etc...
I can see seat adjustment in the pictures: sliding inner square tube. ...

But as has been said there are so many other things missing and they are the awkward thinks that make the fold difficult.
The devil is in the detail : just another student concept - how long did it take for Andre Ritchie to get from concept to a elegant and practical folding bike.

There's no way this would cost anything close to 400, that would pay for the wheels and brakes only.
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Old 08-03-09, 01:12 PM   #7
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as you can see from the pic i think this is just an incomplete proto. no chain, no seat adjustment, no RD, etc...
From the article: "I'm really at the stage where the design is finished..."

So maybe there's some other kind of drive system, perhaps a shaft? It is difficult to see how it would work though.
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Old 08-03-09, 03:30 PM   #8
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I'm not sure if a shaft would even work there, If you look just right behind the pedals is another folding joint. The brake cables should be easy to get through in a fold to those disc brakes and the seat adjustment should be possible with the setup they have. But the biggest problem would be getting a working and efficient drive train on that sucker! If you guys are thinking drive shaft to keep it a clean look I think you'll need to develop some two piece drive shaft where you can have a breakaway in the middle and when you fold it together there's sharp teeth there to mesh together. I'm not sure if that would be efficient or not and the increased chances of breaking since that can be the weakest part of the drive train besides the bevel gears at both ends. Also I think the prototype are using mavic rims there so there goes the budget already! :LOL:

But like a few of the more unique folders on the larger market like Brompton, Strida and BF, it took YEARS to perfect their folding design into a beautiful working package and alot of troubleshooting and R&D. It's easy to get the design out but getting a "working" prototype is another thing.
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Old 08-03-09, 03:48 PM   #9
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I was reading some other article and he replied to some inquiries about the drivetrain, etc. Didn't know it was a chainless!

"Regarding the chain, this version of the bike uses an hydrolic system instead of the traditional chain. I have developed alongside another version which incorporates a chain drive or belt drive, which also works when the bike is folded up. On this hydrolic bike works by oil being pumped inside tubes through the frame of the bike to power the back wheel. This means that the bike doesn't have the oil and grease that comes with chains.

- Dominic Hargreaves, London"

http://www.thisislondon.co.uk/standa...alk/article.do
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Old 08-03-09, 05:49 PM   #10
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A hydraulic drive would have a lot of drag. Be like riding with a sandbag dragging behind the bike.
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Old 08-03-09, 05:53 PM   #11
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I would love to see the finished product. It looks very promising.
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Old 08-03-09, 05:54 PM   #12
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How do you adjust seat height? Is it just an incomplete prototype for demo purposes?
they just get in the way!
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Old 08-03-09, 05:59 PM   #13
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HE needs to be congratulated on the concept. I always though that two folds were needed to achive a really good fold of the frame. Not just a swing under like a birdie ,mezzo,or brommie.

I bet it is a thick package,even with the mono fork and single drop outs. I would like to see the side profile.
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Old 08-03-09, 06:14 PM   #14
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Interesting prototype, but of course there are lots of questions - like how stable is the frame with the two folds? And how well do disk brakes work with monoforks - they do put a lot of stress on the fork...

And it doesn't look like there's any way to attach fenders.
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Old 08-03-09, 08:39 PM   #15
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Interesting prototype, but of course there are lots of questions - like how stable is the frame with the two folds? And how well do disk brakes work with monoforks - they do put a lot of stress on the fork...

And it doesn't look like there's any way to attach fenders.
Strida 5's are on disk brakes and mono forks for years without any reported problems. So I don't think he'll have much problem at all since there's proven technology he can use. The main problem would be an efficient drive train I think from this design. He can have a dual chain or dual belt drive with some gearing to meet up at the fold point.
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Old 08-03-09, 08:56 PM   #16
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Interesting prototype, but of course there are lots of questions - like how stable is the frame with the two folds? And how well do disk brakes work with monoforks - they do put a lot of stress on the fork...

And it doesn't look like there's any way to attach fenders.

Cannondale has been making the Lefty since 2000. My 2006 Prophet 600 has 5" of travel , disc brake, less moving parts, less stiction, and is lighter than coventional forks. Any design success comes down to the execution. As with any product the proof of the pudding is in the eating. Theres ALWAYS a way to attach a fender.
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Old 08-03-09, 09:08 PM   #17
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I think it is very interesting. Very small sideways profile, but quite wide with all the bits between the wheels when folded.

The chainless drive I doubt, I wonder how he intends to keep the hydro tubes closed with the folding joints? Flexible tubes I suppose...

No use shooting down a chainless drive because of drag issues... I doubt it's meant as a racing bike anyway. Hydrolics only have lots of drag if the fluid moves fast through narrow tubes. With the proper selection of ratios drag does not need to be significant. Wind drag will still be #1.
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Old 08-03-09, 09:57 PM   #18
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Only problem with a hydraulic drive.... one pinhole leak and you are stranded. I can't see it having the reliability or efficiency of a chain or belt drive.
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Old 08-03-09, 10:28 PM   #19
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I'm sorry, but BS on the hydraulic drive and BS on the front brake. There's no caliper. And there's no way run two fluid lines inside the frame, through a hinge, and still have a structurally sound mono stay in the back with frame material that small unless its made of an advanced material that would put the price way out of the BS price range quoted.

Lastly, even though I really like single speed bikes, a SS with 26" wheels is absolutely not going to "become the top-selling commuter bike within the next few years".

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Old 08-04-09, 01:07 AM   #20
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I'm sorry, but BS on the hydraulic drive and BS on the front brake. There's no caliper. And there's no way run two fluid lines inside the frame, through a hinge, and still have a structurally sound mono stay in the back with frame material that small unless its made of an advanced material that would put the price way out of the BS price range quoted.

Lastly, even though I really like single speed bikes, a SS with 26" wheels is absolutely not going to "become the top-selling commuter bike within the next few years".
I don't there was the idea that this is a finished bike... I think they are just showing the fold at this stage, the details remain to be sorted I expect. But could be one of those vapour projects that due to lack of interest dies quietly...
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Old 08-04-09, 03:32 AM   #21
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[QUOTE=jur;9415902 But could be one of those vapour projects that due to lack of interest dies quietly...[/QUOTE]

I wounder what is happening about the Dahon CURL?
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Old 08-04-09, 10:22 AM   #22
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I don't there was the idea that this is a finished bike... I think they are just showing the fold at this stage, the details remain to be sorted I expect. But could be one of those vapour projects that due to lack of interest dies quietly...
From the article, direct quote from the designer: "the design is finished"

It will die quickly due to a lack of being possible.
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Old 08-04-09, 10:54 AM   #23
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This link has a video:

http://news.sky.com/skynews/Home/UK-...easer_Region_0

I think I'd be a half mile down the road with my Brompton before this one would be unfolded.
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Old 08-04-09, 12:56 PM   #24
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It does look a bit fiddly, I'd imagine it just collapsing down in a single movement. Also, although he rode it, not once did his feet touch the pedals...
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Old 08-04-09, 01:03 PM   #25
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It has no brakes and no magical hydraulic transmission in that video. He never pedals. The bike does not move under its own power. There are no hydraulic lines inside the frame when he folds the rear. Total BS.
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