REVIEWS DEALS BIKESHOPS TRAILS

Prototype UD seatpost 27.2x350mm

3176 Views 25 Replies 10 Participants Last post by conrad, Dec 24, 2009

Mattias_Hellöre

Discussion Starter · Dec 15, 2009

Here´s my prototype, I will try this on my indoor trainer then on a road bike then a MTB.
All my bikes use 27.2 diameter so the tube has a machined UD carbon shim at 7 grams to fit a 25.4mm UD tube.

Supposed to flex and dampen trail irregularities but have to find really lightweight and cheap clamping hardware to the saddle rails.

As it´s a prototype it CAN break.

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nino

· #2 · Dec 15, 2009

5

Mattias_HellÃ¶re said:
Here´s my prototype, I will try this on my indoor trainer then on a road bike then a MTB.
All my bikes use 27.2 diameter so the tube has a machined UD carbon shim at 7 grams to fit a 25.4mm UD tube.

Supposed to flex and dampen trail irregularities but have to find really lightweight and cheap clamping hardware to the saddle rails.

As it´s a prototype it CAN break.

get KCNC parts !

Shown below are the parts of the 27,2 size

So if i'm calculating right your seatpost would come out at around 107g.That's light! I doubt that the halfround carbon piece will hold up but other than that it looks good.

good luck
nino

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Mattias_Hellöre

Discussion Starter · #3 · Dec 15, 2009

The carbon cradle does weigh 7 grams.

So you are correct, I will first test if UD is suitable for this type of load.

Thanks for the kind words, I want to try something new, if the post will weigh approx 140 grams - no idea to make something.

nino

· #4 · Dec 15, 2009

Mattias_Hellöre said:
The carbon cradle does weigh 7 grams.

So you are correct, I will first test if UD is suitable for this type of load.

Thanks for the kind words, I want to try something new, if the post will weigh approx 140 grams - no idea to make something.

well - i hope you don't reach 140g as this wouldn't be light enough for all the hassle/work you have.

You can already find light 27,2 seatposts that don't cost a fortune like the one shown below. 140g is about KCNC level and those are even cheaper...

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Mattias_Hellöre

Discussion Starter · #5 · Dec 15, 2009

That seatpost is LIGHT!!

Mattias_Hellöre

Discussion Starter · #6 · Dec 15, 2009

I´m still alive, tested on my Avalanche, seems to be fine, took the hardware from one of my USE posts, the carbon cradle seems to work OK.

Sat on the seatpost, rocking it front and back with a hand on tip of saddle, still OK.
Moving up and down, flexing 5-10mm front and aft, seems acceptable.

I will make some more testing.

nino

· #7 · Dec 15, 2009

Mattias_HellÃ¶re said:
I´m still alive

Mattias,
make sure to ship my rings BEFORE you go for more testing !

Mattias_Hellöre

Discussion Starter · #8 · Dec 15, 2009

The rings came in today, looks much better in black, really.
Shipped today to you.

/Mattias

Mattias_Hellöre

Discussion Starter · #9 · Dec 16, 2009

4

Now the first testing phase is finished.

1. Setting up on my Avalanche (baby blue bike), tighten all bolts to 3 nm (seat clamp area).
No slipping, OK.

2. Have heavy lined pants and letting my wife and our youngest daughter Aprilia sitting beside me to eventual problems like I falling or the carbon fiber splintering into me or something that.
Approriate glasses used, unsure about sizing for Aprilia though..

3. Hopping up and down like reseating on a cyclo cross.
No problems.

4. Mounting it on my test mule (black GT Psyclone), tightening to 5 nm, seat binder bolt.
No problems.

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superspec

· #10 · Dec 16, 2009

newdz of wife? oh yea and the seatpost

conrad

· #11 · Dec 22, 2009

cool post...what is the rider weight limit?

Hi Mattias,
you have been busy.....a cool post...is it strong enough for an old 90kg fattie like me....riding a rigid bike....? My thompson is g8 but heavy......
Your rings are holding up well no wear detected yet..lots of testing with it being summer here now..25-30C & 6 wks of christmans holidays to train in....:thumbsup:
cheers
Conrad

moto367

· #12 · Dec 22, 2009

Beautiful family! Who named your daughter? (no 2 wheeled inpiration there huh?) My daughter's name is Montesa, son's name is Race. Funny, my wife named them both. 2 wheeled heritage at it's best. Nice seat post also. :thumbsup:

Mattias_Hellöre

Discussion Starter · #13 · Dec 22, 2009

moto367: I did name my youngest daughter Aprilia Jolie Augusta.

I would like name her Agusta but not allowed..

You know what Aprilia stands for : 2 wheeled motorbike.

The seatpost is working fne yet.

rockymatu

· #14 · Dec 22, 2009

Hi Mattias,

You have an email about this great seatpost.

Cheers,
Matias

moto367

· #15 · Dec 22, 2009

Yes, I'm well aware of Aprilia. I'd love to take a spin on their twin cylinder off-road bike but they are hard to come by here in the USA. Just have to settle for my Husqvarna. :thumbsup: You know what a Montesa is don't you?

Mattias_Hellöre

Discussion Starter · #16 · Dec 22, 2009

moto: yes I do know Montesa.

conrad: current weight limit is 77kg lard assed rider named Mattias

Good to hear your chainrings works well , too well as it would be once a lifetime sale for most riders?

superspec: explain more?

the mayor

· #17 · Dec 22, 2009

@moto367: you have a kid named Montesa?
Hopefully his friend won't ever find out what Montesa' used to be called : Montesticles ( because you had to sqeeze a ball in the rubber fuel petcock )

nino

· #18 · Dec 22, 2009

Mattias_Hellöre said:
moto367: I did name my youngest daughter Aprilia Jolie Augusta.

I would like name her Agusta but not allowed..

You know what Aprilia stands for : 2 wheeled motorbike.

ooooh-Mattias i see you have it with motorbikes too:thumbsup:

My son is called Loris Leandro Valentino....that's no motorbikes but at least two of them are still pretty familiar names in the motorcycling world

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moto367

· #19 · Dec 23, 2009

mayor: My daughter's name is Montesa. And no I didn't know that about montesticles! That's funny though. I have have a good friend who collects Montesa dirt bikes (not trials) and my wife loved the name, so...

superspec

· #20 · Dec 23, 2009

Mattias_Hellöre said:
superspec: explain more?

knewdz= nude pics. its basically a way of saying your wife is pretty, and the fact that your wife is ok with your hobby is just a bonus.:thumbsup:

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