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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 10-02-06, 05:58 PM   #1
gbouchar
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Dahon Speed Hot Rod (pic)

I have been working on an old Dahon Speed for awhile.

I already own a Twenty. The Dahon will do exactly the same thing BUT the folded size is smaller. Since i own a small Jeep (Tracker) and my folding need is more of the car boot type than train/bus type, it will handle the job alright for me.

Please take a look at:

http://www.guybouchard.ca/wp/?lp_lan...=en&page_id=61

It is not completed but right now:
  • Rear derailler hanger
  • Rear rack braze-on
  • Front derailler braze-on hanger with a Campy derailler
  • 2 bottle cages mount on frame tube
  • Replacement of folding handle by an allen bolt to get a positive clamp and no more noise
  • Removable and non-folding handle post for a stiffer handlebar setup

More to come!
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Old 10-03-06, 05:55 AM   #2
LittlePixel
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Sweet mods... Love the 'ratbike' burnt paint too (Yes I do know you'll treat it to a nice powdercoat when it's finished )

I like the new engineering on the clamp fold.
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Old 10-03-06, 07:07 AM   #3
gbouchar
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Thanks!

I like the rat look too!

Yes, when all is done, i will powdercoat it.

The clamp thing was not really good at first. Dahon have better system now.

This one was not effective. Tight enough and i was not able to open it. Loose enough to open it and it was noisy and flexy. With this bolt setup, it is stiff and silent.

Only question is: since the head tube is really short and headset is 1 inch, will i got problem in the long run?

I will use good quality cartridge headset but is it a problem?

It is a fun project. If i was giving me 20$/hour to do the job, it would be better to buy a Bikefriday!
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Old 10-03-06, 07:11 AM   #4
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So you did all the brazing yourself?
juan
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Old 10-03-06, 08:10 AM   #5
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Why not just go with the Sram 3/9 ?
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Old 10-04-06, 12:07 PM   #6
Bacciagalupe
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So how did you replace the handle post? I assume it now works like a Swift's -- i.e. pop a quick release and tug it off, which I guess will make it stronger but would compromise the fold....

From what little I understand, IH's are bullet-proof, but extremely difficult to fix if something breaks inside the hub, and a little less efficient to ride. Bike Friday uses a lot of the SRAM DualDrives so I assume they work pretty well. People do use them -- mostly for kids' bikes really -- so when a mechanic says "I never had to work on a hub in 10 years" it sounds like an accidental testament to their mechanical robustness...
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Old 10-04-06, 12:15 PM   #7
gbouchar
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I do all brazing myself.

I have built several recumbent bikes and customized a few frames.

The 3 * 9 is interesting. The 3 * 7 seem to work well on my girlfriend bike. I don't like the weight AND i know little about internal hub. I would not like to be stuck in one gear and not knowing what to do (principally on the road). I have been a bike mechanic for 10 years but we didn't have to work on one internal hub. Really few people ride them anymore in my area (ok far east in Quebec province). I am really open to internal hub but i would need to learn a lot of things on them. Right now, i prefer what i know.
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Old 10-05-06, 01:53 PM   #8
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Quote:
Originally Posted by Bacciagalupe
So how did you replace the handle post? I assume it now works like a Swift's -- i.e. pop a quick release and tug it off, which I guess will make it stronger but would compromise the fold....
Right.

It is really similar to Swift design.

I prefer stronger with less convenient fold for my use.

I will build a custom front rack a bit similar to BF and may had something (thread) to receive a top plate.
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