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Old 07-19-13, 04:58 PM   #1
freebooter
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Increasing reach on a Dahon TR

I am looking into the options for incresing the reach on a Dahon TR.

The easiest option would seem to be changing the stem. The aberhalo doesn't look to offer enough increase to be worth it. The Andros stem is very difficult to find and is expensive but looks to add maybe a couple of inches and would allow some up and down adjustment as well.

The other option seems to be changing the bars to bullhorns or drops. This would obviously need bars/levers/shifters and would make the fold bigger and less convenient.

Another option may be to swap the handlepost for an extending one which would give some up and down movement but also I have seen some mods where an ordinary ahead stem has been fitted which cn increase the reach considerably but again with a more awkward fold. Also I have read that the extending handleposts are mor wobbly that the single piece on the TR.

The final part solution, I suppose, is just to add long barends to give a longer reach option.

I am just looking for some feedback from anyone who has done something similar or has any other ideas to achieve the same result.

thanks
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Old 07-21-13, 04:56 PM   #2
bhkyte
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Hi options I know of.
1) Bullbars made from upside down cut down road bars fold more compact. If wide enoght might fold either side of wheel when folding.
2 oringin 8 drop bar bar ends and fit quick release and rotate to fold.
3) Use dahon andres stem, I have one (not for sale!) adds. Four inches+add bull bars .....etc
4) Convert stem to qr using a wheel skewer or simular + add drops vull bars.
5) Use promax qr quil stem.
6 use bar ends that resemble bull bars.
7) Its possible that wide bullbars or tt bars will fold either side of the wheel without a qr,or make a wide pair using bar ends.
8) Add bull bars /drops and reduce front wheel spoke count so brakes go through wheel spoke when folding.

See fitting dahon andres stem to brompton, swift thread (oringin8), mezzo upgrade thread for 1 and 4. Hope this helps.
The other advantagers is brifthers using road levers with drops,better handling and braking(your grip is stronger in this postion than on a flat bar).
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Old 07-22-13, 08:23 AM   #3
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Litepro also has a stem similar to the Aber Hallo, but I don't know exact reach dimensions, nor price. I have purchased other stuff happily from Cyclopedia, who specialize in folding bike bits, and who list this stem: http://www.thecyclopedia.com/page8/index.html
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Old 07-23-13, 10:37 AM   #4
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I wanted to repalce the stock with Dahon Radius 3 Extender with Dahon Revolve Stem. That would give height adjustment and open up more handle bar options. But due to other bike priorities and budget restraints I ended up just putting a set of MTB bars (shimmed at the stock clamp) that had a nice forward sweep sorta like a cross between bar ends and bull horns. My next trial for increasing reach and number of hand positions will be to ad trekking bars.
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Old 07-23-13, 04:43 PM   #5
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Thanks for the replies. I will have to search out details on some of the suggestions when I have time.

zebede, How did you shim the MTB bars? I would have thought that most standard bars were tapering at the points the syntace clamp would fit. The problem with trekking bars is that the section with the levers on is behind the clamp and hence would shorten the reach. On normal bikes it is usually recommended to fit a longer stem when swapping to trekking bars.
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Old 07-24-13, 05:38 AM   #6
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I'll post pics of my setup when I've got the time.

Quote:
Originally Posted by freebooter View Post
The other option seems to be changing the bars to bullhorns or drops. This would obviously need bars/levers/shifters and would make the fold bigger and less convenient.
I use Fyxation Rodeo bullhorn bars on my Novara Flyby (ca. 2008 Dahon Mu frame). The bars are a bit atypical because they are 25.4 mm at the clamp (unlike most which are either 26 or 31.8). The fold is the same size. In fact, it's marginally better because the right side of the handlebar doesn't stick out toward the ground when folded.

Warning: these bars do not accept Tektro RX 4.1 levers without a substantial amount of boring. Power tools are required.

My bike has a Nexus 7 hub. I use a wacky setup with the stock grip shifter on a light extender bar. The only other option would be a Jtek bar end shifter ($$$). And that would eliminate the ability to mount a standard reverse brake lever. A normal derailleur would have considerably more options.

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Originally Posted by freebooter View Post
Another option may be to swap the handlepost for an extending one which would give some up and down movement but also I have seen some mods where an ordinary ahead stem has been fitted which cn increase the reach considerably but again with a more awkward fold. Also I have read that the extending handleposts are mor wobbly that the single piece on the TR.
I have an extendable handlepost. It helps the fold, because I can set the bars low enough to fold properly. It needs to sit just above the Magnetix tab for maximum fork clearance. I had to saw both ends (stem and lower) to get an appropriate saddle to bar drop, while retaining just enough to clamp when extended for folding.

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The final part solution, I suppose, is just to add long barends to give a longer reach option.
Bullhorn bars have a lot of reach, which can allow for a considerable amount of torque. They can rotate downwards when hitting a bump at full speed while you're grabbing the very end. To prevent this I have to make the quick release extremely tight. Using bar ends would mean you'd have two additional clamping interfaces to worry about.
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Old 07-24-13, 10:39 AM   #7
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Quote:
Originally Posted by freebooter View Post
Thanks for the replies. I will have to search out details on some of the suggestions when I have time.

zebede, How did you shim the MTB bars? I would have thought that most standard bars were tapering at the points the syntace clamp would fit. The problem with trekking bars is that the section with the levers on is behind the clamp and hence would shorten the reach. On normal bikes it is usually recommended to fit a longer stem when swapping to trekking bars.
Shims made from aluminium soft drink cans. Agreed on your observation on trekking bars. It does not acheive your objective of increasing reach in the normal riding position. But it does give additional reach on the forward part of the bars and additional hand positions. Not ideal but it does offer some pros.

Could you rotate the trekking bars with the opening (with brake levers and shifters) away form the rider instead of towards the rider. Placing the brakes farther away?

Check out this deal on Ebay for a used :Dahon Radius Extender Handlepost With Dahon Resolve Stem

http://cgi.ebay.com/ws/eBayISAPI.dll...30&mfe=sidebar

Last edited by zebede; 07-24-13 at 10:42 AM. Reason: After Thought
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