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Light 34.9mm 400mm setback seatpost?

7309 Views 21 Replies 13 Participants Last post by Jerome, Mar 3, 2010

tate6969

Discussion Starter · Dec 30, 2009

I need a setback seatpost for my scott spark and am aware of the following manufacturers:

Ritchey WCS - 25mm
Edge - 10mm

I have a Ritchey carbon Pro at the moment, but it weights 315g! im sure i could knock 100g off that if i could find the right post.

I know their lighter and more commonly available, but straight ones are no good. Im also not entertaining the idea of a shim to 31.6mm cause i reckon 34.9 looks fat...

A bit of eye candy while im at it.

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nino

· #2 · Dec 30, 2009 (Edited)

Are you sure you need setback?
By looking at your bikes it seems you have the saddle on your roadbike much more forward than on your FS. And i see on your FS you have the seatpost exposed quite a bit so the saddle should be already much farther back from the seatangle alone...and as soon as you sit on it with the sag from the rear you will have more angle as well. By judging from the pics above i'd say you are already sitting more behind now than on your roadbike. But maybe i'm wrong.

By the way - i think you could have taken one size bigger on both bikes...you have the seatposts exposed quite a bit on both. If i'm not all wrong the Sparks suffer when they are ridden a bit too small.This makes for extremely exposed seatposts...the weight beeing too far back and i think the front grip isn't ideal anymore. But maybe that was the case for the precedessor, the Scott Genius? I just have something like that in my mind. Looking at your bikes i see huuuuge saddle heights and short top-tubes combined with a very low handlebar position.

Anyway - as far as i remember there are no lightweight setback seatposts other than the New Ultimate.Maybe AX-Lightness Europa but that one comes in 31,6 only and would need to be shimmed (i don't see any problem in using shims though)

The New Ultimate comes in 400mm lenght and weighs 179g.You can see mine cut to 330mm below: 152g

It has about 10mm setback only though.

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4

MessagefromTate

· #3 · Dec 30, 2009

For once I will agree with Nino, your saddles are in different positions completely with your road being much more forward (straight pin and the seat angle is steeper). Buy yourself a plumb line and a ruler and learn to measure the setback behind your bottom bracket. If the bikes feel the same to you, then your cleats are in a different position. You need to resolve your positioning before looking at new seatposts.

Cezex

· #4 · Dec 30, 2009

Keep in mind, that shackles on seatpost shown by Nino is not saddle friendly, you can even see that it slightly bends the rails on last picture. More info in this thread.

I use Cycle King Ultimate Ti 34.9x400mm at 207g (you can also get one at 350mm) which costs about 70 EUR.

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tate6969

Discussion Starter · #5 · Dec 30, 2009

thanks for the comments. i understand what youre saying, but i have put a fair bit of thought into my saddle positions, for both bikes.

for the road, i like to be well over the bottom bracket because i also use it a bit for time trialling. a forward position opens up the torso and you can push back on the pedals more. handling suffers, but power output is much better. the saddle nose tip is 60mm behind the centre of the bottom bracket, which is 10mm more than it needs to be by UCI regulations.

for the mtb, i dont want handling to suffer. i had a zero setback seatpost on my last bike (kona kikapu) and it handled like the proverbial, aka rubbish. i agree judging from the picture, it could come forward maybe 10mm so that the two positions arent so extreme. doing so would put the saddle in the centre of the current seatpost bracket which tells me i need at least some sort of setback.

size wise, i chose a medium for both. my inseam length is 950mm, but my torso is quite short in comparison. i hate being stretched out too far and so this means a high seatpost with a medium bike.

i have just seen the edge seatpost option:
http://www.edgecomposites.com/seatposts.aspx

has anyone had any experience with the clamping mechanism?

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nino

· #6 · Dec 30, 2009

tate6969 said:
thanks for the comments. i understand what youre saying, but i have put a fair bit of thought into my saddle positions, for both bikes.

for the road, i like to be well over the bottom bracket because i also use it a bit for time trialling. a forward position opens up the torso and you can push back on the pedals more. handling suffers, but power output is much better. the saddle nose tip is 60mm behind the centre of the bottom bracket, which is 10mm more than it needs to be by UCI regulations.

for the mtb, i dont want handling to suffer. i had a zero setback seatpost on my last bike (kona kikapu) and it handled like the proverbial, aka rubbish. i agree judging from the picture, it could come forward maybe 10mm so that the two positions arent so extreme. doing so would put the saddle in the centre of the current seatpost bracket which tells me i need at least some sort of setback.

size wise, i chose a medium for both. my inseam length is 950mm, but my torso is quite short in comparison. i hate being stretched out too far and so this means a high seatpost with a medium bike.

i have just seen the edge seatpost option:
http://www.edgecomposites.com/seatposts.aspx

has anyone had any experience with the clamping mechanism?

I still don't think you have the saddle where it belongs on your MTB ...this has to be done with a plumb. There's no other way to see if the position is correct or not.
If you say you can move forward 10mm it would mean a straight post will fit.

Anyway -looking at the EDGE seatpost they (!) give a 172g weight for the 27,2 size and they don't even say if that's for the straight post or the setback.My guess is that's for the straight one...so in the fat 34,9 size with setback this might be well over 200g.

In this case you could also look for the standard Ritchey WCS carbon which is standard on higher priced Scotts.That one is around 230g.

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racerick

· #7 · Dec 30, 2009

nino, im surprised youre recommending that post to him

that thing is a tank

im waiting on the superlogic 1 bolt post 30.9 x 400
tuned, it should come in at around 165... i hope

DHFreak

· #8 · Dec 30, 2009

I have an Origin 8 Pro series lite carbon post that weighs right around 190 or 195 grams. I weighed it when I first bought it and don't remember exactly. The post isn't showing up on there site anymore so I could not tell you if the make one in that size or not.

Mike

nitropowered

· #9 · Dec 30, 2009

You also have to consider sag when setting your seat setback on a full suspension mtb. unfortunately, its pretty hard to do yourself, you'll need help to get the seat set up right.

And you can probably do a straight post by the looks of your two bikes

Mattias_Hellöre

· #10 · Dec 30, 2009

If you want a really light post, don´t look at mass produced posts or use something with a shim, it would suit your needs better.
For example a KCNC post with a shim?

Marreiros

· #11 · Dec 30, 2009

Cezex my friend, where can I buy the cycle king seat post in 34,9mm x 400mm?

Cezex

· #12 · Dec 31, 2009

I've bought it at Extremebike shop here in Poland.

nino

· #13 · Dec 31, 2009

Cezex said:
I've bought it at Extremebike shop here in Poland.

whoa-that shop is suuuper expensive.You can find those seatposts for much less on Ebay

Cezex

· #14 · Dec 31, 2009

No it's not, they just have a broken currency conversion rate on their website. If you'll find Cycle King 34.9/400mm seatpost for less than 100 USD (with shipment) please let us know, I couldn't.

nino

· #15 · Dec 31, 2009

Cezex said:
No it's not, they just have a broken currency conversion rate on their website. If you'll find Cycle King 34.9/400mm seatpost for less than 100 USD (with shipment) please let us know, I couldn't.

easy - it took me 3 clicks:
http://cgi.ebay.com/09-Racing-Ultim...Desktop_PCs?hash=item19b88682ac#ht_1822wt_941

Cezex

· #16 · Dec 31, 2009

88$ and more than month of waiting (and possibly additional duty nad VAT fee). Ok, but I prefer 100$, one week of waiting and easy/fast warranty replacement in case of any damage.

Marreiros

· #17 · Dec 31, 2009

Thanks for all the replies.

nino

· #18 · Dec 31, 2009

Cezex said:
88$ and more than month of waiting (and possibly additional duty nad VAT fee). Ok, but I prefer 100$, one week of waiting and easy/fast warranty replacement in case of any damage.

i on the other hand would prefer to pay a little more to get a lighter seatpost.For my taste almost 200g is not light enough.

eric512

· #19 · Mar 2, 2010

racerick said:
nino, im surprised youre recommending that post to him

that thing is a tank

im waiting on the superlogic 1 bolt post 30.9 x 400
tuned, it should come in at around 165... i hope

Did you ever get the Superlogic and test the weight?

yellowbook

· #20 · Mar 3, 2010

racerick said:
nino, im surprised youre recommending that post to him

that thing is a tank

im waiting on the superlogic 1 bolt post 30.9 x 400
tuned, it should come in at around 165... i hope

I got a superlogic 400x31.6 with Ti-bolt.....weighs 184g.

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