Rack for 20" folding bike with wheels
#1
The Recumbent Quant
Thread Starter
Rack for 20" folding bike with wheels
Hi,
Does anybody know where I can find a rear rack for Birdy or Bike Friday that has wheels so I can roll the bike when folded? Most racks for Brompton's are too small.
Thanks,
Charles
Does anybody know where I can find a rear rack for Birdy or Bike Friday that has wheels so I can roll the bike when folded? Most racks for Brompton's are too small.
Thanks,
Charles
#2
Full Member
Paul from Origami Bikes might be somebody worth asking. He's currently developing a wheeled rack for his company's upcoming soon to be released 20" Swift folder. The rack will be specially designed for the Origami Swift, but it'll possibly work with a Birdy or a Bike Friday as well. Worth enquiring.
https://www.bikeforums.net/folding-b...n-classic.html
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Paul from Origami Bikes might be somebody worth asking. He's currently developing a wheeled rack for his company's upcoming soon to be released 20" Swift folder. The rack will be specially designed for the Origami Swift, but it'll possibly work with a Birdy or a Bike Friday as well. Worth enquiring.
https://www.bikeforums.net/folding-b...n-classic.html
https://www.bikeforums.net/folding-b...n-classic.html
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Paul Pinigis
Owner of Origami Bicycle Company
Paul Pinigis
Owner of Origami Bicycle Company
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#4
The Recumbent Quant
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#8
The Recumbent Quant
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This is from Tern, but it's too expensive IMO:https://www.ternbicycles.com/us/acce...transit-rack-m
I'm hoping I can find something to use with a Bike Friday when the real wheel is folded 180 degrees (like Brompton does).
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#9
#10
The Recumbent Quant
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Birdy racks are proprietary ones and afaik are different for Birdy Mk 3, 2. I’m not sure Birdy rear rack will fit other bikes as the one I have on my R&M Birdy Mk 3 Touring is designed to collapse once bike is folded. You can see this rack in this review, wheels are mounted at the end of this rack. If that’s what you are looking for you can order them from R&M dealers. There are other options on Aliexpress from other manufacturers but I have no experience with them.
I see various racks on Aliexpress, but as far as I can tell, all of them are sized to fit Brompton's smaller wheels.
#12
The Recumbent Quant
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Maybe it’s a stupid question but did you ask Bike Friday? Racks with wheels would normally be designed for a certain bike model. Or look for something like this
That definitely looks like a possibility. Thanks!
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We made our first attempt, but we have shipped it off to a company that specializes in racks to get them to tweak the design, and then produce it for us.
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Paul Pinigis
Owner of Origami Bicycle Company
Paul Pinigis
Owner of Origami Bicycle Company
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Here is our latest effort.
Tip the back back to roll it on the trolly wheels
Tip the back back to roll it on the trolly wheels
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Paul Pinigis
Owner of Origami Bicycle Company
Paul Pinigis
Owner of Origami Bicycle Company
#18
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What is triangulation and why is it used in frame structures?
Examples of Triangulation
The design of Frame Structures: Triangulation
P.S. Moreover here the rack is supposed to support the bike and this just on its edge.
Last edited by 2_i; 10-13-22 at 10:22 AM. Reason: PS
#20
Schwinnasaur
BTW, I did not mean to criticize you. I very much respect you and your opinions. I just wanted to understand your comment.
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First off, I said it is not a perfect triangle. Many racks are not. Many have adjustable rods to connect to the chain stays that look a lot like Pinigis's. When I first read your comment, I did not know which plane of the rack you meant. I think it likely that you're letting the perfect be the enemy of the good.
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What?! it is a valid engineering criticism. I am not sure I have a rack that is not triangulated - I seem to bypass those that are not. You seem to be dismissing the history of frame construction (scaffolding, Eiffel Tower, bridges) and these days even of molecular design.
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I usually tour with a Tubus Logo EVO rear rack on my medium or heavy duty touring bike, extremely stiff and robust. On my light duty touring bike I tour with a Racktime Addit rack, also very stiff and a weight capacity that although is less than the Logo is still more than adequate for my needs.
But both of those racks are in storage right now because for riding around near home I am looking for a wider platform and do not need the weight capacity of those touring capable racks.
Two photos of part of my light duty touring bike, the first photo is with the Racktime Addit rack that I use for loaded touring with my camping gear.
Second photo, this is the rack I use for riding around home. It serves my needs very well for that purpose. Occasionally used with one or two shopping panniers, but often just used with a rack top bag, it is more than adequate.
The prototype rack cited above on the folding bike might not be built for heavy duty touring, but perhaps it is sufficient for most needs of potential customers?
#23
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I am a retired engineer, and have lots of miles of bike touring with heavy loads on a bike. It is my professional engineering opinion that sometimes all you need is a light duty rack.
The prototype rack cited above on the folding bike might not be built for heavy duty touring, but perhaps it is sufficient for most needs of potential customers?
The prototype rack cited above on the folding bike might not be built for heavy duty touring, but perhaps it is sufficient for most needs of potential customers?
The particular rack, discussed earlier, was to carry the folded bike while rolling. According to a parallel thread the project was abandoned due to insufficient stability, not clear whether the structural stability discussed here, or just geometry.