Carbon rail saddle tightening torque

Started by BeR, February 05, 2025, 10:27:03 AM

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BeR

What tightening torque to do you use for these screws with a carbon rail saddle ?

Hokum

#1
I use this one and like it a lot. There's clones on Ali with different ranges (Enlee "bike torque wrench" or somesuch)
https://www.amazon.com/BIKE-HAND-YC-637-BITS-Measurement/dp/B07MVLVGJ5

Mine seems to be precise enough when measured with another wrench.


edit: my bad. 6nm usually.

BeR

Quote from: Hokum on February 05, 2025, 11:32:46 AM
I use this one and like it a lot. There's clones on Ali with different ranges (Enlee "bike torque wrench" or somesuch)
https://www.amazon.com/BIKE-HAND-YC-637-BITS-Measurement/dp/B07MVLVGJ5

Mine seems to be precise enough when measured with another wrench.

I missunderstand myself : I mean tightening torque in Nm.

SirBikealot

Quote from: BeR on February 05, 2025, 02:27:25 PM
I missunderstand myself : I mean tightening torque in Nm.
as i only know carbon rails are almost always? the oval ones, so on my oval rail clamp 8nm is recommended. And that is what i went for.

jonathanf2

On that style seat post clamp, I only tighten screws until they are firm. I never over tighten and make sure I apply lots of carbon paste.

BeR

Quote from: jonathanf2 on February 06, 2025, 02:13:04 PM
On that style seat post clamp, I only tighten screws until they are firm. I never over tighten and make sure I apply lots of carbon paste.

I agree for carbon paste. No idea of torque in N.m ?

ZacItaly15


Ludo

5-8Nm is the recommended range on ELITA one seat post.
2 screw system, 5Nm seems enough for me, on 1 screw, 8Nm is needed

BeR

I have just seen that Specialized suggest 3,1 N.m front and 6,1 N.m rear.

3,1 N.m seems too little.

Ludo

And single bolt system at 13Nm, that looks high to me. I never venture that high!

ZacItaly15

I suggest to use some carbon paste (fibergrip) in the craddle of the seatpost