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PostPosted: Thu Apr 02, 2009 12:18 pm 
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in the industry

Joined: Thu Jan 08, 2009 12:16 pm
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Location: Melbourne Australia
I made some carbon upper and lower clamps for the Thomson Post, they are the same shape as the original ones but half the weight and look tre's cool. I will put some more pics and info on my website soon.


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Thomson carbon clamp.jpg [ 90.56 KiB | Viewed 2339 times ]

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Posted: Thu Apr 02, 2009 12:18 pm 


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 Post subject:
PostPosted: Thu Apr 02, 2009 1:52 pm 
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those are hot...... availability & cost?


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PostPosted: Thu Apr 02, 2009 3:10 pm 
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Location: San Diego
I would be interested in these too.

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PostPosted: Thu Apr 02, 2009 4:09 pm 
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Joined: Tue Oct 18, 2005 6:02 pm
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Location: The Netherlands
Me too :D

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PostPosted: Thu Apr 02, 2009 4:13 pm 
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The German dude's modification failed, it says in his text!

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PostPosted: Thu Apr 02, 2009 4:28 pm 
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Location: Tilburg, Netherlands
In a dutch test the post failed, not even tuned


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PostPosted: Thu Apr 02, 2009 4:36 pm 
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Davidtwc wrote:
In a dutch test the post failed, not even tuned


You need to provide more details with this sort of statement. Anything can fail if the test is sufficiently nonrepresentative of real-world loads. Any product which competes on weight is going to be compromising reliability to some extent. For example, a post optimized for a 56 kg rider is going to break with a 168 kg rider.
Similarly a post optimized for the road might not be best for mountain biking downhill.

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PostPosted: Thu Apr 02, 2009 6:05 pm 
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Location: Near Horgen, Switzerland
Yes, the biggest reason for using a Thomson post is that the seat clamp properly spreads the load into the saddle rails, reducing likelihood of a bent or broken saddle. The clamp is also engineered that the post will bend before the clamp snaps to save your arse. Also it's pretty light - comparable to many carbon posts and IMHO much stronger and damage resistant than those. All that says to me that it's a foolhardy thing to meddle with the clamp unless you are prepared to do a similar amount of testing to ensure your parts are similarly strong.

I have two Thomson masterpieces on my tandem and they work flawlessly. Also the anodising does not flake off with a bit of British winter salt. The bolts are angled so that you can turn them with an allen key...These points are not true for some Italian products I could mention. Truly it is a superior device to many lightweight "tube with a hole plus two screws and a U" seat posts from Tune, KCNC, USE, WR Compositi, 3T etc....

Best close copy IMHO is the Syntace post and that's about the same weight but costs more. Case closed.


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PostPosted: Thu Apr 02, 2009 11:53 pm 
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Location: Seattle
Here is a link to mine.

Im still using it as my every day seatpost.

http://weightweenies.starbike.com/forum ... lite+tuned


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PostPosted: Fri Apr 03, 2009 12:45 am 
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Location: Melbourne Australia
corky wrote:
those are hot...... availability & cost?


Yes I will make some available, PM me if interested

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PostPosted: Fri Apr 03, 2009 1:59 am 
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Location: Sydney, Australia
Cool, PM coming your way.

fletch62: If you want, I have some carbon seatpost offcut that would probably suit a DIY job like that. PM me if you're interested, it's you'rs for the cost of postage.

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PostPosted: Fri Apr 03, 2009 8:44 am 
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Location: The Netherlands
Little OT: does anyone know if the masterpiece has Ti hardware? I know the Elite has steel, but not sure about the mp..

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PostPosted: Fri Apr 03, 2009 9:18 am 
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Location: Oztralien
One that i have been looking at and trying to source is this:
The carbon cradle extends along the saddle rails and the top clamps are in line with the ends of the cradle so no extra pressure points.


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PostPosted: Sat Apr 11, 2009 3:39 am 
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Location: San Francisco, CA
Some data from my Thomson Masterpiece:

clamp diameter: 31.8 mm
original length: 350 mm (stated)
original mass: 190.3 grams
cut-section (3.9 cm): 9.7 grams = 2.5 grams / cm
final mass: 180.4 grams
sawdust: 0.2 grams (calculated)

clamps (2): 48.1 grams
cylinders (2): 9.4 grams
bolts and washers (2): 11.7 grams
cut post: 111.2 grams (cut)
uncut post (calculated): 121.1 grams

The clamp is an obvious source of weight savings. Not much in the bolts (8.3 grams here, saving 3.4 grams). Cutting is an obvious no-brainer.... cost me $5 at the local shop, around $0.5/gram.

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PostPosted: Sun Apr 12, 2009 10:09 pm 
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Location: San Francisco, CA
me: So what do you think of these clamps?
girlfriend: You're asking hypothetically, right?
me: (pause) No. They save 30 grams!
girlfriend: You can't be serious. I would be very upset if you got those. They're totally untested.
me: Yeah... well.... if they failed, they probably wouldn't do so catastophically....

Anyway, it looks like I'm out :).

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Posted: Sun Apr 12, 2009 10:09 pm 


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