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 Post subject: Dalsnibba
PostPosted: Fri May 02, 2014 12:29 pm 
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Joined: Sun Mar 27, 2011 8:16 pm
Posts: 429
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This bike was shown at Bespoked 2014 where it won the Steve Worland award for "Most innovative design" for the use of conductive paint (essentially powdered silver in varnish) to form the power and signalling circuits for the Di2 groupset.

http://talbotframeworks.co.uk/wp-content/uploads/2014/04/innovative1.jpg

I mention this because it was something we did purely for the fun of it, because we had the idea and thought it would be cool- and for no other reason.

With that said, one of the nicest things about the show was the validation that yes, other people thought it was fun as well.

On to the bike!

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This bike is called the Dalsnibba after a mountain in Norway- a mountain that has an annual duathlon run on it's slopes.

I'll be racing this bike (or the second version of it- more on that later) in the duathlon this June.

That had some input on the overall design- we wanted the frame to be very stiff around the BB-Chainstay area for power transfer (what little of that I have I don't want to squander), and also to steer very precisely for the descent- again, I need all the help I can get there as last year I was shaking so hard that I could barely hold the bars.

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To that end we used a 38mm Columbus Spirit downtube, with at one end a Paragon Machineworks 44 headtube and at the other a Paragon Machine Works PF30 bottom bracket.

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The fork chosen was an ENVE tapered steerer unit, again stiffness was a key consideration.

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We used a Columbus MAX bi-axially ovalised top tube, in the reverse orientation than is normally seen.

The thinking behind this was to ensure that the joints to the 44 headtube at one end and the 28.6 seat tube at the other were allowed for in the orientation of the tube, and provide nice large contact areas for the fillets.

We also thought it looked cool.

Image

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The seat tube we chose was Reynolds 853, swaged from 28.6mm at the top to 31,8mm at the BB, in order to keep the frame stiff around the BB cluster but to allow some flexibility nearer the seat cluster.

Chainstays and seatstays were a mixture of Columbus Zona and Life, and a wishbone was chosen for the seat stay.

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This connected the two 14mm seat stays to the 16mm wishbone, the idea being to take advantage of steels ability to flex without work hardening and becoming brittle.

As an old man I liked the idea of comfort, without sacrificing stiffness.

The dropouts were Paragon Machine Works, and I think that concludes the tubing choice and design- it was all mitred on the Talbot End-Mill, and then fillet brazed by Matt on the Anvil Journeyman jig in his workshop in Crystal Palace.

Once the frame was finished it went to Mario Vaz who primed it, painted it brilliant white, then painted the blue sections on the top tube, seat tube and seat stays.

The frame then came back to us, where we bonded on flexible terminal pads just behind the head tube, and on the seat tube and DS-chain stay.

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The bare circular patch of metal you can see is because we used the frame itself as one of the circuits- it is the negative.

I'd spoke to a friend who is a very talented painter about the circuits- without letting on that that was what I had in mind, he'd recommended going to a Pin Striper, so we found one in Croyden, a lovely guy called Neil, who we took the frame too in order to have the circuits painted on.

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We then used the services of the "masked engineer" to solder on the (remnants of) the Di2 wiring harness.

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He did a very neat job- which because we ran out of time had to be left visible:

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The plan was to pot these joints in epoxy, then wrap then in vinyl dressing tape, and then clearcoat the whole frame.

That we didn't have time to do that was a blessing in disguise at Bespoked as people could see what we were talking about.

Although it did look distinctly "prototype", which is fair enough as that is what it was.

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As it stands the bike weighs in at 7.2kg, with HED Stinger 4's and an electronic groupset from 2009.

I'm happy with that- we could hit the UCI minimum with a change of wheels and a modern group.

More here: http://talbotframeworks.co.uk/bikes/dalsnibba/


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 Post subject: Re: Dalsnibba
PostPosted: Fri May 02, 2014 1:35 pm 
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Joined: Mon Feb 19, 2007 3:44 am
Posts: 1734
Location: Canada
Bravo :beerchug: !

Great work !!!



Louis :)


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 Post subject: Re: Dalsnibba
Posted: Fri May 02, 2014 1:35 pm 


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 Post subject: Re: Dalsnibba
PostPosted: Fri May 02, 2014 10:32 pm 
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Joined: Tue May 12, 2009 10:03 am
Posts: 378
Thats awesome!!!


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 Post subject: Re: Dalsnibba
PostPosted: Sat May 03, 2014 12:09 am 
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Joined: Sat Nov 23, 2013 12:37 am
Posts: 19
Location: Ottawa region, Canada
Great work and great idea, looks really great


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 Post subject: Re: Dalsnibba
PostPosted: Sat May 03, 2014 3:10 am 
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Joined: Fri Jan 03, 2014 7:37 am
Posts: 233
very, very cool. loving the wishbone setup too.

care to disclose the geo?


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 Post subject: Re: Dalsnibba
PostPosted: Sat May 03, 2014 7:40 am 
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Joined: Mon Mar 28, 2011 6:46 pm
Posts: 279
Location: Amsterdam
Brilliant!
Although this is not the lightest bike, this is what weightweenies is about, innovation.
Well done!


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 Post subject: Re: Dalsnibba
PostPosted: Sat May 03, 2014 10:55 am 
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Joined: Sun Mar 27, 2011 8:16 pm
Posts: 429
dogg wrote:
very, very cool. loving the wishbone setup too.

care to disclose the geo?


Broadly the same as a 58cm Cannondale Evo, albeit with a sloping top tube that matches the -6 stems angle.


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 Post subject: Re: Dalsnibba
PostPosted: Sat May 03, 2014 3:25 pm 
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Joined: Fri Nov 14, 2008 4:55 am
Posts: 430
Just wow. Any idea what the charge is that gets sent across the circuits?

What might happen do you think if you rode in the rain .... Or could you throw a varnish over the top?

Just curiosities but wow that's rad and beautiful.

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 Post subject: Re: Dalsnibba
PostPosted: Sat May 03, 2014 4:28 pm 
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Joined: Sun Mar 27, 2011 8:16 pm
Posts: 429
We never measured that, sorry- just confirmed that we had 7.5v at the live by the mechs, and that the circuits had continuity.

As is, if you rode the bike in the rain it'd be a disaster- however, once we've clearcoated it we should be fully waterproof.


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 Post subject: Re: Dalsnibba
PostPosted: Sun May 04, 2014 4:39 am 
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Joined: Wed Oct 31, 2007 10:32 pm
Posts: 7412
Location: Los Angeles / Glendale, California
Beautiful work, and thank you for the documentation of the build/design process!!

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 Post subject: Re: Dalsnibba
PostPosted: Sun May 04, 2014 6:50 am 
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Joined: Tue May 08, 2012 3:10 am
Posts: 69
Location: Santa Barbara
Brilliant design. I'll be eager to see future frames with this feature. Forgive me if this is a silly question, but is it possible to do other colors for the conductive paint? If so, is it possible to make the conductive patches blend in with the rest?

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 Post subject: Re: Dalsnibba
PostPosted: Mon May 05, 2014 11:33 am 
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Joined: Mon Jun 02, 2003 8:17 am
Posts: 5829
Location: Drenthe, Holland
Wow, what an innovative idea!

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 Post subject: Re: Dalsnibba
PostPosted: Mon May 05, 2014 1:12 pm 
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Location: Athens, Greece
+1
Cool!

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 Post subject: Re: Dalsnibba
PostPosted: Tue May 06, 2014 2:44 am 
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Posts: 262
Thanks for sharing this. You rightly deserved that award! Interested to see the final steps as well and find out if it continues to work in the rain.

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 Post subject: Re: Dalsnibba
PostPosted: Tue May 06, 2014 3:25 am 
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Joined: Tue Oct 25, 2011 4:50 am
Posts: 63
Brilliant.


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 Post subject: Re: Dalsnibba
Posted: Tue May 06, 2014 3:25 am 


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