## 3T Dorico Team Seatpost - To Cut or Not to Cut?

Discuss light weight issues concerning road bikes & parts.
Layback
Posts: 11
Joined: Sat Mar 31, 2012 5:02 am
Contact:
Does anyone know how much weight can be saved by cutting the seat post? I'm interested in g/mm or g/cm. This could easily be determined by knowing the difference in weight between a 27.2 x 280 vs a 27.2 350 3t dorico team seatpost. Unfortunately, I can't seem to get weights online anywhere including the 3T website and weight weenies and I'm trying to determine if the risk of not being able to raise my saddle higher is worth the return. Thanks.
2011 Cervélo RS - SRAM Red

prendrefeu
Posts: 8605
Joined: Wed Oct 31, 2007 10:32 pm
Location: Los Feliz, Los Angeles, California
Contact:
Take your seatpost apart.
Weigh the carbon shaft.
Measure the carbon shaft.

Measure the distance you plan on cutting off.
Calculate potential weight savings.

Decide.

Exp001 || Other projects in the works.

alibongo
Posts: 51
Joined: Fri Oct 29, 2010 11:35 am
No point in carrying the extra weight... Chop it!!!

Then tell WW how much you saved!!

Barrie
Posts: 26
Joined: Fri Mar 23, 2012 8:56 am
Location: lancashire UK
I cut 4" of a carbon seat post ( I cant remember the make ) but it weighed 35g

Barrie

BobSantini
Posts: 292
Joined: Sun Jul 10, 2011 9:03 am
Cut it off. Weigh it. Then you'll know how much you saved
r o y g b i v

natiedean24
Posts: 366
Joined: Wed Jun 10, 2009 2:16 pm
Location: Austin, Texas
Contact:
the only way to know for sure is to cut it and weigh it after. Grams/cm may vary along the length - my Syntace P6 post had a thinner wall at the very bottom end compared to the rest of the post.

I saved 39 grams by cutting around 9 cm from my post.

neeb
Posts: 370
Joined: Tue Jan 27, 2009 8:19 pm
Just make sure you leave enough length so that it goes far enough into the seat tube to end at or below the lower junction with the top tube. If you want to save the maximum amount of weight you can cut it diagonally so that it is longer at the front when inserted.

Leave a centimeter of leeway to allow for possible height adjustment.

Layback
Posts: 11
Joined: Sat Mar 31, 2012 5:02 am
Contact:
Thanks for all of the good thoughts guys. I appreciate all of the responses. I'm also considering switching to the Doric since it doesn't seems as though I need a setback post (note that the saddle is all the way back for proper knee/spindle alignment):

So I'm also not terribly eagerto cut it without knowing all of the facts.

prendrefeu wrote:Take your seatpost apart.
Weigh the carbon shaft.
Measure the carbon shaft.

Measure the distance you plan on cutting off.
Calculate potential weight savings.

Decide.

It's not that easy with a Dorico Team. The head weighs much more than the shaft. The only true way to accurately calculate g/cm would be to know the difference in weight between the 350 and the 280.

I know for certainty, as a result of this (http://weightweenies.starbike.com/forum/viewtopic.php?f=3&t=69718), that the 350 weighs 235.8 grams. Does anyone know the weight of the 280?

I'm guessing about 35-50 grams of savings but I'm kind of obsessed with calculating it for some reason… OCD??
2011 Cervélo RS - SRAM Red

btompkins0112
Posts: 2693
Joined: Fri Feb 11, 2011 3:04 am
Location: Mississippi
Yes, it appears you need a zero setback post.....and possibly a bigger frame

Layback
Posts: 11
Joined: Sat Mar 31, 2012 5:02 am
Contact:
I can see how you'd possibly conclude that. But I have really long legs and a short torso. The fit is perfect. With a 61 my ass slides off the nose. I have 64cm of reach. Impossible to achieve with a 61cm frame.
2011 Cervélo RS - SRAM Red

btompkins0112
Posts: 2693
Joined: Fri Feb 11, 2011 3:04 am
Location: Mississippi
Yeah, that's why I put the "no idea" icon.......either wrong frame or outlier body dimensions. Guess its the latter!! Good looking bike, btw!

Layback
Posts: 11
Joined: Sat Mar 31, 2012 5:02 am
Contact:
No worries. I didn't take any offense. And thanks!
2011 Cervélo RS - SRAM Red

BobSantini
Posts: 292
Joined: Sun Jul 10, 2011 9:03 am
If you really wanted to go to the trouble you could use a displacement measurement.
Measure the water volume displaced by the whole thing with the clamp and metal bits removed.
Then measure the water volume displaced by the shaft alone for the length you propose to remove.
The ratio of volume to volume will be the same as weight to weight.
r o y g b i v

2011
Posts: 177
Joined: Tue Sep 20, 2011 8:15 pm
If someone saddle is tipped that far forward from being level, it almost always means they need lower their saddle a few centimeters and level it out. Or secondly... you're riding the wrong saddle for your body type.

Anyway... with your saddle up that high, I probably would suggest not cutting much off. You want it to go quite far into the frame, otherwise you risk a broken post or even frame.

And you say you need a set-back post... yet it appears in the photo that your saddle is slammed almost all the way FORWARD! You mean a set-back post... to ride in reverse?

Layback
Posts: 11
Joined: Sat Mar 31, 2012 5:02 am
Contact:
Thanks for the tips guys. I'll have to try the water displacement idea.

Regarding set-back/no set-back I see that I chose my words rather poorly. What I meant is that I may want to switch from a set-back (Dorico) to a zero set-back (Doric) hence my desire to not cut right now.

Thanks again!
2011 Cervélo RS - SRAM Red

• Similar Topics
Replies
Views
Last post