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PostPosted: Mon Nov 02, 2009 5:43 pm 
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Impresive work.... :shock: :shock: :shock:

http://www.forum.light-bikes.de/showthread.php?t=8347

http://freenetfoto.de/userwebsite;jsess ... =15&pos=46 (Pics 47-55)

Maybe any of the guys that were in the Ax Lightness "open-doors" day can tell us more about this build....


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Posted: Mon Nov 02, 2009 5:43 pm 


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PostPosted: Mon Nov 02, 2009 6:27 pm 
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wowzers. Clive Sinclair would be proud.

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PostPosted: Mon Nov 02, 2009 6:57 pm 
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That seems to be a servomotor widely used for miniature robots. Wonder how large the controller is though :mrgreen:


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PostPosted: Mon Nov 02, 2009 7:45 pm 
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wouldn't it be easy'er, cheaper, more durable and better looking just to get the Di2?


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PostPosted: Mon Nov 02, 2009 7:55 pm 
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Simon BP wrote:
wouldn't it be easy'er, cheaper, more durable and better looking just to get the Di2?


the thread was posted in 09 May 30th.
he probably started the project before Di2 was available..

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PostPosted: Mon Nov 02, 2009 8:11 pm 
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>wouldn't it be easy'er, cheaper, more durable and better looking just to get the Di2?

People sometimes do things because they like to work on it.


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PostPosted: Mon Nov 02, 2009 9:01 pm 
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Some serious carbonilicious tinkering going on in Deutschland! Great to see someone out there driving innovation.


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PostPosted: Mon Nov 02, 2009 9:51 pm 
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It's not surprising that someone has combined a servo with a derailleur. I think there's a large potential market for this if the DA system takes off. Some cleverness with the controller is needed, but the servo side of things should be relatively painless. Using an off the shelf servo would also make sense so you can swap it out for much less than a whole new assembly.

In my view the servo is not the limiting factor here. There are a wide range of models (size, weight, speed, torque, output) My other hobby is electric model helicopters. Servos nowadays can directly drive a large model helicopter to do 3D flying (continuously spinning the heli on 1 or 2 axes while doing an airplane aerobatic maneuver). To do this on a large heli you're looking at moving a 5kg load on servo horn 3cm long faster than your fingers can move. Front derailleurs no problem.


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PostPosted: Mon Nov 02, 2009 9:57 pm 
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Epic-o wrote:

Dead link, it just redirects to the frontpage.


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PostPosted: Mon Nov 02, 2009 10:24 pm 
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2 wheels wrote:
Epic-o wrote:

Dead link, it just redirects to the frontpage.

Sorry....this is the most amazing part of the project (Note the shifters):


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PostPosted: Mon Nov 02, 2009 11:00 pm 
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Impressive home made bike !!!

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PostPosted: Tue Nov 03, 2009 12:12 am 
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and the guy races it! really amazing!

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PostPosted: Tue Nov 03, 2009 8:05 am 
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I've seen this bike in person as well. The guy did a cool job building his own bike and his own DI2. Correct me if I'm wrong but I think he made the DI2 for 50 euros.
During a ride I was behind Norbert (the owner of the bike) and one thing really struck me. His fork was very flexy and constantly wobbling.

Norbert also made his own wheels. Better check the pics as well as you can guys ;)

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PostPosted: Tue Nov 03, 2009 9:15 am 
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You've got to take your hat off to this guy, but he's going to be ****** if it rains :lol:

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PostPosted: Tue Nov 03, 2009 9:25 am 
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it is very very cool that he has build his own bike from the bottum up! Respect!! I would really like to be able to do that too! Those wheels, are they campagnolo alloy with a home made carbon cover on? They look very cool!
Frankie, do you know some of the weights on his parts? Aspecially the aerobars and his seat/post combo :)


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Posted: Tue Nov 03, 2009 9:25 am 


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