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Folding Bikes Discuss the unique features and issues of folding bikes. Also a great place to learn what folding bike will work best for your needs.

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Old 05-02-14, 08:21 AM   #1
Azreal911
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Hubless folding bike

It's a neat concept but I love how they show you how small the frame folds but they NEVER show you the wheels that you would have to carry around! I remember there was another folder like that where you still have to lug the big 26" wheels around but they never talk about them. Just to carry two big and probably heavy hula hoops around with your would be quite a hassle.

This Hubless Bicycle Folds to the Size of an Umbrella
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Old 05-02-14, 03:24 PM   #2
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Impressive. However hubless is the sort of thing young inexperienced designers pick but they are impractical. When I see hubless I move on.
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Old 05-02-14, 04:07 PM   #3
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The opportunity to not run the chain right down by the dirt was missed..
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Old 05-02-14, 06:52 PM   #4
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..

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Old 05-03-14, 02:08 AM   #5
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Designers neexdto get over the small wheel thing. If this had 20" wheels they could be lighter stronger and more portable. Turning this into a valid project. Instead of the deadend its travelling in.
Example would you have this or an a paffic reach, or airaminal?
Easy decision , try again designer.
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Old 05-03-14, 05:57 AM   #6
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Interesting design exercise... but where are the wheels in the folded picture?

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Old 05-03-14, 06:20 AM   #7
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Very interesting, and I like the way it looks. Certainly different. There is a video that shows a little more, including the wheels and a backpack with the wheels. That would be a pretty wide pack. It never shows it being folded, so I wonder if the mechanism works as well as claimed.

Multimedia | Gianluca Sada Bike - Hubless and Foldable
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Old 05-03-14, 04:44 PM   #8
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Actually,it does:
http://www.sadabike.it/sadaBikeWP/wp...13/08/pic3.jpg



Apparently,you carry the wheels separate,sorta like Montagues. I guess you just loop the wheels over your shoulder.
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Old 05-04-14, 07:06 AM   #9
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I just noticed 2 things: in the folded package, the handlebar has been removed. Naughty. Handlebars are quite a big problem for folding especially when there are brake cables to consider. (How does this bike brake anyway?? Do you throw out an anchor?)

2nd, I see it has a Schlumpf Speed Drive. I suppose the designer found out if you drive a rim with a small drive wheel, the gearing is ridiculously low. Might as well ditch the rear wheel and ride on the pulley directly. Saves you the hassle of dealing with the back wheel which gives zero advantage.
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Old 05-04-14, 02:26 PM   #10
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Dynarider: They show it folded, but not being folded. Perhaps because, as Jur points out, the handlebars are removed. That wouldn't look very good. They also show a backpack for the wheels in the video; carrying them over your shoulder might be easier as long as they are clean and dry.

They show him riding the bike in the video, and it looks to be geared pretty low but not too terrible for a city bike. Perhaps there is a way of gearing it up even more; maybe an internal gear in the rear pulley?

So the marketing seems a bit disingenuous, but I still like the look and the concept.
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Old 05-04-14, 03:14 PM   #11
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Quote:
Originally Posted by graycenphil View Post
They show him riding the bike in the video, and it looks to be geared pretty low but not too terrible for a city bike. Perhaps there is a way of gearing it up even more; maybe an internal gear in the rear pulley?

So the marketing seems a bit disingenuous, but I still like the look and the concept.
I'm not sure the video is of a working prototype or if it's partly staged. There needs to be some very substantial gearing-up done somewhere in the drivetrain to make the concept feasible - otherwise you'd be pedaling like mad and not even achieving a walking pace.

But it seems like a number of designers of folding prototypes and concepts are starting with the idea that using the usual 16" or 20" wheelsize of most folders imposes some huge disadvantage so they come up with concepts that have a bigger wheel but with lots of other drawbacks. Having toured and gone on fairly fast century rides with my 20" wheeled Bike Friday it seems to me that this is a misconception and wheel size is not such a significant issue.
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