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-   -   home built Bakfiets (http://www.bikeforums.net/utility-cycling/782045-home-built-bakfiets.html)

hotbike 04-19-13 11:42 AM

Quote:

Originally Posted by MrRickyReno (Post 15528070)
What materials (metal) are you guys using for these bikes? Just whatever is available at the local steel distributor or ordering tube sets like Nova Cycle has?

I built a cargo bike in the past based on Tom's Cargo bike designs. His instructions definitely work but I found it to be a bit too flexible until I built the cargo area into a steel framed box. I will try and dig up some pics sometime and put them on here.

MrRickyReno

You could do it with all fiberglass and never even use metal. (Though the military classifies fiberglass as "Aviation Sheet Metal", an oxymoron). If you get good at fiberglass bikes, you could start making carbon fiber bikes. just remember, carbon fiber cost 70 times what fiberglass costs. I've even noticed that it is ridiculous to build a carbon imitation of a steel bike design. Start fresh. Or build a Carbon knock-off of a Bowden Spacelander. A fiberglass design will work better in carbon than a steel design in carbon. You could re-use the same molds, substitute carbon for 'glass. You can save thousands of dollars by not buying a welding rig.

jerdavismn 08-15-13 05:15 PM

Nice work on your bike! I'm looking at embarking on this project as well. I've got a frame sourced for the back end, and I've picked up some tubing for the frame. I have a few questions about your build if you don't mind.


What were your final measurements in degrees for the bend at the end of the main beam up to the forward headtube, and what was the length of that section?


Did the "fins" you added forward and aft of the steer tube improve the stiffness of the frame? What diameter and thickness of tubing did you use for the main beam?


If you've got an updated schematic with your dimensions and geometry choices I'd love to see it!


Thanks a lot for all the info you've posted already, I've been scouring the internet for info on builds and trying to piece stuff together.

artur elias 01-15-14 10:53 AM

Quote:

Originally Posted by jerdavismn (Post 15965271)
Nice work on your bike! I'm looking at embarking on this project as well. I've got a frame sourced for the back end, and I've picked up some tubing for the frame. I have a few questions about your build if you don't mind.


What were your final measurements in degrees for the bend at the end of the main beam up to the forward headtube, and what was the length of that section?


Did the "fins" you added forward and aft of the steer tube improve the stiffness of the frame? What diameter and thickness of tubing did you use for the main beam?


If you've got an updated schematic with your dimensions and geometry choices I'd love to see it!


Thanks a lot for all the info you've posted already, I've been scouring the internet for info on builds and trying to piece stuff together.


Sorry I didn't see your response, jerdavismn, it's a long time since it was posted here.

The photo album has been up dated several times, and more pictures are coming since the frame is out for powder painting right now!

I've posted all my sketches including the final (nš 5). I think the pictures go a long way in answering to to your questions, but I'll come back with some numbers too.

The "Bici-Caixa" has been in service - unpainted... - for almost 2 years and aprox. 1500 - 2000 km.

http://www.flickr.com/photos/2376346...7629923628370/

noglider 01-23-14 11:22 AM

artur, that is outstanding!

hotbike 01-23-14 03:19 PM

http://www.flickr.com/photos/11629987@N02/sets/72157639939606343/

Update, I have started a new photo album at flickr dot com.

Most of my bikes are really Utility Bikes, with the cargo container streamlined to give the "look" of a Velomobile.

http://www.flickr.com/photos/11629987@N02/sets/72157639939606343/


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