Clamping Carbon Seatpost & Height Adjustment

mikeyj28

Hi
2 Main points here:

1: Is a carbon seatpost more vulnerable when being clamped into my downtube? I am using a salsa QR clamp.
Reason for asking is that my old seatpost kept slippimng down approx 1cm every 30-45 mins of riding and had the clamp pretty tightly locked on.
Just asking as i don't want to unknowingly fatigue/stress/break the seatpost.

2: For a 400mm seat post am i actually getting an extra 5cm more height extension of the seatpost (or is it more like eg 3cm?) until i reach the maximum height limit?

Also should i grease the seatpost before putting it on my bike?

Thanks

Greer_

Yep, grease it using carbon paste - the same for carbon stems and bars

mikeyj28

Greer_ wrote:

Yep, grease it using carbon paste - the same for carbon stems and bars

i thought as much. Cheers

Anyone have any ideas on points 1 & 2 in my question?

leaflite

The carbon paste is "grip paste"- it reduces how tight you need to do up the seatclamp to stop the post slipping.

cooldad

1 - worry about that if it slips - it shouldn't.
2 - depends on the min insertion limits of the two posts.

mikeyj28

Sorry guys in point 2 I was comparing a 350mm seatpost with a 400mm seatpost.

cooldad

mikeyj28 wrote:

Sorry guys in point 2 I was comparing a 350mm seatpost with a 400mm seatpost.

Still depends on the minimum insertion limits as to how much useable post you have.

cooldad

But all things being equal, it will be 50mm.

mikeyj28

cooldad wrote:

But all things being equal, it will be 50mm.

As in 50mm more available extension/height availability.