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Old 11-08-17, 09:46 AM   #1
kayakindude
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Extending Dahon reach

Hello,

Brompton has a seat extender and I was wondering if Dahon has something similar or an aftermarket. I am 6'3 and am used to the reach but think of extending without adding more to the handlebar and going with the seatpost instead. Have my bar ends already.

Thanks
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Old 11-08-17, 11:43 AM   #2
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Originally Posted by kayakindude View Post
... I was wondering if Dahon has something similar or an aftermarket. I am 6'3 and am used to the reach but think of extending without adding more to the handlebar and going with the seatpost instead.
I'd recommend contacting Thor (thorusa.com). He's very knowledgeable about Dahons.
Steve
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Old 11-08-17, 01:51 PM   #3
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blush .... thanks
yup ABer Hallo will work or litepro thor
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Old 11-08-17, 02:11 PM   #4
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Hi Thor- right those will extend the handle bar...I am talking about opening the reach by bring the seat back 2 or 3 inches.
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Old 11-08-17, 02:37 PM   #5
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Originally Posted by kayakindude View Post
Hi Thor- right those will extend the handle bar...I am talking about opening the reach by bring the seat back 2 or 3 inches.
There are no Brompton-style seatposts for Dahons that I'm aware of. You would need a handlebar extender like Thor listed.
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Old 11-09-17, 11:50 AM   #6
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Originally Posted by Joe Remi View Post
There are no Brompton-style seatposts for Dahons that I'm aware of.
Google, 37 seconds.

Or you could use a long setback seatpost with a telescopic seatpost.

HTH
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Old 11-09-17, 12:47 PM   #7
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Good for you for finding setback solutions, but those aren't Brompton-style seatposts. Let the record show!
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Old 11-09-17, 02:42 PM   #8
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Thanks for the feedback- yes I also searched google and amazon and saw some options for a regular bike. Just not sure if the design of the Dahon post can handle my weight shifting a few inches back? Sorry if I was not clear. Just thinking I keep a better fold by opening the cockpit by going backwards...but a long unsupported pole may be a concern?
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Old 11-09-17, 03:31 PM   #9
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Any tube style seat post is 7/8" at the top , then a Brompton SAP, (saddle adapter pin) will go on it

and offer a horizontal tube also 7/8" /22.2mm to fit a common saddle clip upon (or the primo Brompton Pentaclip )

and have a set back adjustment along it's length, + the saddle rail adjustment along it's length..





...
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Old 11-09-17, 03:35 PM   #10
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Originally Posted by kayakindude View Post
Thanks for the feedback- yes I also searched google and amazon and saw some options for a regular bike. Just not sure if the design of the Dahon post can handle my weight shifting a few inches back? Sorry if I was not clear. Just thinking I keep a better fold by opening the cockpit by going backwards...but a long unsupported pole may be a concern?
I can't verify that it's a real problem, but personally I agree with your concern about the physics of it. I can't remember what they call it, but Tern makes a bar extender with a quick-release so you can adjust it for folding. I had one on a Dahon Curve D3 and it was easy to use.
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Old 11-10-17, 10:27 AM   #11
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All in all, I think Kayakindude is onto a good track wanting to extend both seat and handlebar post. You really want to be balanced.

My sense is that you would do well either with a ABer Hallo or a Touring style looped Handlebar. Below is a picture of mine on my Touring Bike that gives me a variety of hand positions and lengths.

The "Trekking" one shown has some shortcomings, primarily in that one bar component is actually short of your stem, but it does fit on most Dahons (25.4 fitting) and it has outside and far positions that can be very helpful.

I stock the Dimension and I intend to bring back the one that is on my Expedition pictured.
Attached Images
File Type: jpg Dimension Trekking HB0099.jpg (24.8 KB, 37 views)
File Type: jpg 2017-10-21 07.23.29 Expedition Other Scott trimmed.jpg (100.6 KB, 37 views)
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Old 11-10-17, 10:37 AM   #12
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Quote:
Originally Posted by kayakindude View Post
Just not sure if the design of the Dahon post can handle my weight shifting a few inches back? Sorry if I was not clear. Just thinking I keep a better fold by opening the cockpit by going backwards...but a long unsupported pole may be a concern?
This is similar to having a flatter angle on the seatpost and this does change it abit. I have a bike that has a flatter angle and I do feel the seatpost flex more. You could simulate this by trying a 20" wheel on the front of your Curve for just a bit (if it fits) and keeping 16" in the back.

I may try the inverse of that on the bike where my post flexes a bit more than I like.

I think we can definitely work through this however. Seatposts can be strengthened for one. We can also run tension members to reduce "bowflex" in the seatpost. If everything is designed right the bowflex in the seatpost should not be a problem but should actually be a feature.

My opinion today anyway.
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Old 11-10-17, 12:49 PM   #13
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I was mainly exploring it because after stumbling into info on the Brompton extender, it seems logical to open in both directions and as a bonus a seat extender would seem to have zero impact on the fold. My handlebar on the Vybe still folds with the Ergon threes, but only by extending the handlebar before folding to the max height to clear the magnets.
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