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 Post subject: Trek 4.7 Seat Post Clamp
PostPosted: Tue Oct 23, 2012 1:18 pm 
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Joined: Tue Oct 23, 2012 1:08 pm
Posts: 6
Location: England
Hi,

My seat post clamp is 30.2mm, can anyone help me to find a really light one - around 7grammes please? It's easy to find light clamps on eBay in 31.8 at that weight, but I'm struggling with this smaller size.


Regards in advance, darth.


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 Post subject: Trek 4.7 Seat Post Clamp
Posted: Tue Oct 23, 2012 1:18 pm 


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PostPosted: Tue Oct 23, 2012 3:13 pm 
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Joined: Thu Dec 17, 2009 5:30 am
Posts: 54
You probably need to look for a 30.0mm seatpost clamp. Some frames are off just a tiny bit, but the closest standard size should work without any issues. I know I have seen 35.0 seat post clamps for seat tubes that are 34.9mm. I hope that helps!


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PostPosted: Tue Oct 23, 2012 4:29 pm 
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Joined: Tue Mar 10, 2009 5:27 am
Posts: 1244
Location: McCall, ID
I think Parts of Passion makes one. It is the Purist, and it is right at 7 grams. It is a ridiculous $90, but it does come in a 30mm.

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PostPosted: Wed Oct 24, 2012 11:00 am 
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Joined: Tue Oct 23, 2012 1:08 pm
Posts: 6
Location: England
Thanks for that, Zen. Although it is exactly what I'm after, it's too tall! I only have a fraction over 10mm to play with and it's about 16.75mm! Indirectly I then found the Mcfk Clamp - which too is lovely - but that's 15mm high! :-( Think I may just have to engineer one my self...


Attachments:
File comment: My re-engineered I-Fly saddle & Bontrager carbon post, with Brunel style supports!
Saddle.jpg
Saddle.jpg [ 80.84 KiB | Viewed 1638 times ]
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PostPosted: Sat Nov 03, 2012 4:24 am 
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Joined: Tue Oct 23, 2012 1:08 pm
Posts: 6
Location: England
DONE IT!

Couldn't find a light clamp in 30.2 so took a chance and bought this 31.8 (http://stores.ebay.com/Mr-Ride-Bicycle/ ... =958687367), and cut a 10mm strip of an old store loyalty card (similar to a credit card) and bent it round the seat post under the new clamp. Total weight including this 'shim': 8.5grammes!!! :D


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PostPosted: Sat Nov 03, 2012 6:27 am 
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Joined: Sun Jun 17, 2012 3:45 am
Posts: 100
Uhhhh...
I have to ask. What's going on with your seatpost/saddle combo there? It looks very interesting.

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Posted: Sat Nov 03, 2012 6:27 am 


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PostPosted: Sat Nov 03, 2012 2:32 pm 
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Joined: Tue Oct 23, 2012 1:08 pm
Posts: 6
Location: England
Hey Werdna,

It was yet another of my 're-engineering' projects that I tend to bury myself into on days when I feel anal about cutting the bike's weight down by yet another gramme!

I bought the I-Fly saddle based on reviews of how light it was, but when I weighed it I found it to be considerably over that figure! Turned out - after talking to SDG - that the updated saddles had been made stronger (and therefore heavier), and the light versions didn't exist any more! :-(

The same was the case with the seat posts as well! So I decided to go about it my self and in the process make something very 'unique'!!!

Here are some pics of the work in progress, and the first attempt (last pic.) at how to secure the saddle to the post (before I decided to copy Brunel).


Attachments:
IMG_0740.jpg
IMG_0740.jpg [ 87.02 KiB | Viewed 1503 times ]
IMG_0741.jpg
IMG_0741.jpg [ 99.33 KiB | Viewed 1503 times ]
IMG_0742.jpg
IMG_0742.jpg [ 139.63 KiB | Viewed 1503 times ]
IMG_0930.jpg
IMG_0930.jpg [ 130.54 KiB | Viewed 1503 times ]
IMG_0938.jpg
IMG_0938.jpg [ 100.4 KiB | Viewed 1503 times ]
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