Another Easton EC90 post tuning!

Discuss light weight issues concerning road bikes & parts.
MrRedRaider
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Joined: Wed Nov 05, 2008 11:59 pm
Location: Little Rock, AR

by MrRedRaider

Hello guys, you may remember my thread a couple of months ago about finding a UD carbon seat post for my BMC build. A suggestion to an Easton EC90 tuning thread got me interested, and I chose that route. First of all, I contacted Ax-Lightness and got two of their aluminum yokes, at a claimed 8g a piece. They were actually 8.2g a piece, at 8.2 euro a piece.. neat. I was originally going to get an EC70 post, because they seemed to be the version that is UD carbon and not weave. Apparently, there are some EC90 posts that are also UD, even though 95% of the pictures I have seen are of weaved versions. I found this one on ebay for $40, and bought it immediately. Was trimmed to 270mm, perfect. Ordered the M6x35 titanium bolts from Toronto cycles, and got them today (8 business days). Got the dremel out, and went to town.

Widened the holes for the bolts first, since the original bolts were M5 (or was it M4?). Next I took the half pipe outside and used a grinding bit to chew off as much as I could, with the old EC90 thread as a reference- viewtopic.php?t=14674" onclick="window.open(this.href);return false;" onclick="window.open(this.href);return false; An hour later, here it is.

EC90 Stock, 270mm = 169.3g
Carbon post, no hardware = 95.6g
Stock hardware(yokes, bolts, halfpipe) = 73.7g
EC90 with new hardware = 138.2g (-31.1g)
Carbon post, cut to ~220mm = 73.9g (-21.7g)
New hardware = 38.9g (-34.8g)
After dremel work = 112.5g (-56.8g)

Beat felix by half a gram! But he did this four years ago, so I say he still wins. I think it would be lighter if it was the weave version, as felix had his cut to 260mm and mine is cut to 220mm. However, I bought the UD version to match the BMCs UD carbon frame. Thanks for looking!

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Last edited by MrRedRaider on Fri Feb 12, 2010 4:36 pm, edited 2 times in total.

by Weenie


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Frankie - B
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by Frankie - B

Great post!

Thanks
'Tape was made to wrap your GF's gifts, NOT hold a freakin tire on.'

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Danton
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by Danton

Good work, well done. The flame of weight weenies is still burning.

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bcheung
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by bcheung

Frankie - B wrote:Great post!

:roll: punny! :beerchug:

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synchronicity
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by synchronicity

So you milled out a unidirectional carbon seatpost cradle.
Not the smartest move.Image
Vertebrae. Precision braking and shifting.

MrRedRaider
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Location: Little Rock, AR

by MrRedRaider

Mr Felix did it, why shouldn't I? May I add that I weigh 120lb. Furthermore, that carbon cradle is so thick I bet it would withstand a bomb. Im not kidding, the post is the same, excessively thick. That is why I posted this "tuning" thread on this forum called "Weight Weenies."

deepsky
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by deepsky

Send it to me, I'll break it for ya :)
While I might not weigh as much as some bombs, 180lbs can do some damage :thumbup:

sawyer
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by sawyer

great work. i have two of these posts and like them but hate the heavy steel stock bolts. question: what Ti bolts would work instead?
----------------------------------------
Stiff, Light, Aero - Pick Three!! :thumbup:

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Frankie - B
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by Frankie - B

@ Sawyer
Ordered the M6x30 titanium bolts from Toronto cycles


It is not about breaking it, it is about building light! Great Job!
'Tape was made to wrap your GF's gifts, NOT hold a freakin tire on.'

Oberon
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Location: Tasmania, Australia

by Oberon

I think sawyer was asking what size are the bolts supplied with the post - M4 or M5 ??

Nice mod there MrRedRaider.

MrRedRaider
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Location: Little Rock, AR

by MrRedRaider

They are M5.

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Daddy yo yo
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by Daddy yo yo

synchronicity wrote:So you milled out a unidirectional carbon seatpost cradle.
Not the smartest move.Image
that was exactly what i thought when i looked at the pictures... lightweight construction is one thing, but lightweight diy-tuning is another. my a*s and by bal*s are way too precious for such an experiment. but i admit that i weigh one or two pounds more than you. :mrgreen:
My contribution to more beautiful roads: - old - / - new -

dandancast
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by dandancast

That is a real Weight Weenies!! I am impressed! :thumbup:

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tochnics
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by tochnics

i did the same thing years ago with the same post, i ended up with a ax post in the end because i needed some ofset
there is so much to gain in that heavy clamp system its almost criminal how its build
i have the weave version, if i ever find a ride then i will use the post again
nice going with the modding
Join the light side

a light bike does make you go faster unless you are slow

LegalizeMyCAAD9
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by LegalizeMyCAAD9

Nice! I love the Easton posts and forks!

by Weenie


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