Seatpost reducer on carbon frame

Discuss light weight issues concerning road bikes & parts.
Post Reply
paradawt
Posts: 331
Joined: Wed Aug 10, 2011 4:03 pm
Location: Porto, Portugal

by paradawt

Hello guys.

I need an help.

I am thinking about buy a Deda Superleggero seatpost. My frame is a 2010 Cannondale Supersix wich uses 31.6 diameter seatpost.

Currently brands are marketing the frames with 27.2 and I am thinking about buying to that extent.

I will have any problem using a reducer on carbon frame?

Thanks a lot for your help.
Cannondale Supersix '10

by Weenie


mitchgixer6
Posts: 228
Joined: Sat Sep 22, 2012 2:22 pm

by mitchgixer6

I used a plastic reducer on my carbon frame for many years without issue. Just make sure you use some carbon assembly paste

paradawt
Posts: 331
Joined: Wed Aug 10, 2011 4:03 pm
Location: Porto, Portugal

by paradawt

Thanks mitchgixer6.

A friend of mine tell me I have the risk of breaking the frame.

Is that true?
Cannondale Supersix '10

mattr
Posts: 3458
Joined: Fri May 25, 2007 6:43 pm
Location: The Grim North.

by mattr

depends on the frame and the shim design, ask the manufacturer.

Generally a frame without a massively dropped top tube or an extended seat tube, using a long shim (10-12cm) will be fine.
As you move away from this it will *tend* to make a shim less suitable, as it adds an extra tolerance/more movement into the system.

paradawt
Posts: 331
Joined: Wed Aug 10, 2011 4:03 pm
Location: Porto, Portugal

by paradawt

This picture help us.

What do you think?

Image
Cannondale Supersix '10

eric
Posts: 2196
Joined: Tue Nov 11, 2003 9:47 pm
Location: Santa Cruz, California, USA
Contact:

by eric

I use a USE 27.2 mm spacer in one of my carbon frames for the last 7 years. It's not broken yet.

If the shim is as long as the frame manufacturer's recommended post insertion it'll be fine. If that's not known it should be well below where the top tube meets the seat tube.

paradawt
Posts: 331
Joined: Wed Aug 10, 2011 4:03 pm
Location: Porto, Portugal

by paradawt

Yes eric.

I have about 11cm below.
Cannondale Supersix '10

User avatar
mellowJohnny
Posts: 484
Joined: Thu Aug 16, 2012 12:56 am
Location: YYZ

by mellowJohnny

Same here - I used this one with no issues for more than a year, also on a SuperSix. Just make sure you use carbon paste and you will be fine.

http://www.chainreactioncycles.com/use- ... -prod43707

User avatar
BRM
Posts: 817
Joined: Sun Mar 16, 2014 3:43 pm

by BRM

So because of some manufacturers marketinghype, you are going to buy parts that doesnt suit your frame? . . . .

:|


BTW
In the wanted section you ask for: Deda superleggero stem 31.6
You forgot to mention the desired length.

(I have one , new in Original box 100 mm, but still haven't decide if Í keep it or not.
bought it for a frameset that I sold before it even was build) (not sure yet if it will fit my new build)

paradawt
Posts: 331
Joined: Wed Aug 10, 2011 4:03 pm
Location: Porto, Portugal

by paradawt

BRM,

But you have seatpost or stem?

I'm looking for seatpost.
Cannondale Supersix '10

mattr
Posts: 3458
Joined: Fri May 25, 2007 6:43 pm
Location: The Grim North.

by mattr

BRM wrote:So because of some manufacturers marketinghype, you are going to buy parts that doesnt suit your frame? . . . .
A skinny seat pin may take out some road vibrations. A 31.6 probably won't. That's one of the issues with massively oversize frame tubes, you need massively oversize seatpins.

by Weenie


Post Reply
  • Similar Topics
    Replies
    Views
    Last post