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PostPosted: Tue Feb 26, 2013 1:10 am 
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Joined: Sun May 22, 2011 3:36 pm
Posts: 21
The other month I thought about making a pair of super light road/mtb shoes from carbon, but it would've been just a bit to much for my experience with carbon at the moment, so the next best thing was to buy a pair of what is one of the lightest football boots out there (adidas f50 adizero) and convert them!
Its a bit easier for me to do this because I use SPD's and Mid Sole Cleats.

So, here's how it went:

First weight the shoes with insole and laces,
Right ~ 165
Left ~ 163
Image

Next up is to trim the studs and try to make the bottom as flat as possible for the 7 layers of carbon.
ImageImage
16 grams saved from the trimming of the right, trimmed the left more.

Slap 7 layers of carbon onto the bottom and roughen them up for clear coat.
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Put a couple of layers on the inside for the cleat fixings.
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Weight without insoles and laces.
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Needed to add a carbon wrap over and under the toe to help the carbon sole remain in contact with the plastic base (my first pair lifts off after months of walking around).
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Clear coat. Should've done the toe wrap first.
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Fit cleats and weigh.
Left 241g
Right 238g
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Each shoe was just over 200g before cleats and fixings.

So, after all that work, I have a pair of race shoes which are nearly half the weight of my actual races shoes I have been using for years (modified mtb shoes)!
Because the F50's are so cheap on ebay (around £20/$30), I am going to get myself a few more pairs and make some summer ones with lots of vents, and I plan to see if I can remove the original plastic sole and save myself maybe 80g+ a shoe!

Because I was surprised how flexible a single layer of carbon is, I decided to finish of by making some toe warmers!
This one weighs 12.8g and is obviously not perfect, so I will have a few more tries and see if I can get it looking a bit nicer :)
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Posted: Tue Feb 26, 2013 1:10 am 


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PostPosted: Tue Feb 26, 2013 1:27 am 
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Joined: Sat Apr 22, 2006 12:38 am
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Location: Dutchess County, NY
Love it- great work. Let us know how they hold up!

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PostPosted: Tue Feb 26, 2013 1:32 am 
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Location: somewere floating between here and the other side
Midsole cleats ? Do you use these for "normal"ridding purposes ?


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PostPosted: Tue Feb 26, 2013 2:11 am 
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Location: Netherlands
midsole cleats it's quite popular in triathlon apparently.

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PostPosted: Tue Feb 26, 2013 2:46 am 
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Location: Tucson, AZ
Awesome!


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PostPosted: Tue Feb 26, 2013 3:41 am 
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Joined: Tue Mar 20, 2012 1:19 am
Posts: 60
That's awesome! How stiff are they compared to your normal road shoes?

I also really like the carbon toe warmers, I just wonder about breathability. You could use the carbon like you have done to make a bracket, and then perhaps glue some water proof breathable fabric in place. There is some pretty light stuff out there, like the 1.4oz per square yard cuben fibre (47gsm). A 10x15cm piece of that would come in around 0.7grams.


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PostPosted: Tue Feb 26, 2013 4:00 am 
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Joined: Mon Jan 21, 2013 9:00 pm
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That's a pretty cool idea. You will be able to make some really cool stuff with carbon fiber! 8)


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PostPosted: Tue Feb 26, 2013 4:39 am 
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Joined: Wed Jun 08, 2011 6:08 am
Posts: 124
Nice project. Thanks for sharing. First time I've seen midsole cleats.

I just made some custom commuter shoes last month. They're not weightweenie so I won't post them, but isn't it a fine feeling riding around in shoes you made yourself?


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PostPosted: Tue Feb 26, 2013 4:43 am 
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Joined: Fri Jun 01, 2012 6:40 pm
Posts: 196
How did you source the carbon fiber? What was the process to mold and cure it?


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PostPosted: Tue Feb 26, 2013 11:22 am 
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Joined: Thu Feb 19, 2009 10:52 am
Posts: 134
Cool project!

Liggero wrote:
midsole cleats it's quite popular in triathlon apparently.

Not that far back! :unbelievable:
I ride "mid sole" (speedplays with the aluminium baseplate) as it saves my calves to run off the bike.
Makes a big difference, but I couldnt imagine riding with the cleats that far back. Would be very weird climbing out of the saddle!


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PostPosted: Tue Feb 26, 2013 11:48 am 
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Location: WALES,UK
Isn't a cleat positioned there gonna cause problems with toe overlap on the front wheel?

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PostPosted: Tue Feb 26, 2013 2:37 pm 
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Location: Palm Coast, Fl.
BeeBee30 wrote:
Isn't a cleat positioned there gonna cause problems with toe overlap on the front wheel?


You have a point there. Looks like you would have a half a foot into the wheel area.


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PostPosted: Tue Feb 26, 2013 2:45 pm 
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Have you ridden these yet? I find that generation of f50's to be extremely flexible and generally unsupportive. Not sure how well they would translate to a cycling shoe.

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PostPosted: Tue Feb 26, 2013 5:44 pm 
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BeeBee30 wrote:
Isn't a cleat positioned there gonna cause problems with toe overlap on the front wheel?
Not to mention he probably has to really watch it in the corners as I would think it would be quite easy to catch the shoe on the ground if pedaling during hard cornering. :shock:

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PostPosted: Tue Feb 26, 2013 5:56 pm 
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Joined: Sun Dec 28, 2008 10:15 pm
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Location: Hungary
Interesting project, but I would think mid cleats on such a flexible sole is not gona be much good.
I wouldn't like to pedal hard with my arches.


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Posted: Tue Feb 26, 2013 5:56 pm 


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