Slipping saddle on Colnago SP31 carbon post...
jaredpurdy1960
Posts: 20
in Road general
Greetings,
I recently purchased a new Colnago SP31 carbon seat post to be paired with my new-to-me C60, and have a question about the saddle sliding forward. I've read multiple posts on different sites from members who have had difficulty getting the saddle to the correct level they're after, or it's slipping in the seat tube. Neither of those issues have been my experience. I followed advice and used carbon paste on the post and the tube, and the post is solid.
While setting the correct level can be a pain (Colnago needs to supply a dedicated spanner wrench with the post), I have managed to get that right after some tweaking.
My issue so far, and that is after two 40km rides, is that the saddle slides forward, This is revealed when I get home and proceed to wipe down the bike and notice it. I've read that it's a good idea to grease the rocker so that it can be positioned without resistance. I've noticed that both the front and rear adjustment bolts appear to be a bit tight, so I was thinking of pushing a pit of grease on each one. Lastly, I was wondering if putting carbon past on the rails and clamps would stop it from sliding?
Regards, JP
I recently purchased a new Colnago SP31 carbon seat post to be paired with my new-to-me C60, and have a question about the saddle sliding forward. I've read multiple posts on different sites from members who have had difficulty getting the saddle to the correct level they're after, or it's slipping in the seat tube. Neither of those issues have been my experience. I followed advice and used carbon paste on the post and the tube, and the post is solid.
While setting the correct level can be a pain (Colnago needs to supply a dedicated spanner wrench with the post), I have managed to get that right after some tweaking.
My issue so far, and that is after two 40km rides, is that the saddle slides forward, This is revealed when I get home and proceed to wipe down the bike and notice it. I've read that it's a good idea to grease the rocker so that it can be positioned without resistance. I've noticed that both the front and rear adjustment bolts appear to be a bit tight, so I was thinking of pushing a pit of grease on each one. Lastly, I was wondering if putting carbon past on the rails and clamps would stop it from sliding?
Regards, JP
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Comments
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I have the same seatpost and have never had this issue. In fact it’s never slipped in the frame either. My saddle has oval rails- don’t know if that may have an effect or not.
I dabbed a little carbon paste on the rails as they are carbon braided.
I’d imagine greasing the bolts would be a good idea, mine are, I believe your torque wrench will ‘click’ earlier if the threads aren’t greased resulting in a lower clamping force. Good idea for anti-corrosion too I guess.1 -
I may have not been tightening the bolts enough. I did grease them, and they turn as smooth as self now. Also, I got my torque wrench and set it to 10nM, and we'll see if that does the trick. My rails are not oval, and they are some type of metal. Not sure what they are? Could be titanium, could be something else . The saddle is very light.0
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I think I have the same seatpost, I have carbon braided rails and never had an issue.1
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After some Internet sleuthing, I discovered the the rails on my Prologo saddle are called Triox, used in the aero space industry. They're a light weight, composite steel. May add some carbon paste if they keep slipping.shirley_basso said:I think I have the same seatpost, I have carbon braided rails and never had an issue.
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10Nm on those bolts sounds very high- especially if you greased them too. I reckon mine are like 6Nm or so.jaredpurdy1960 said:
After some Internet sleuthing, I discovered the the rails on my Prologo saddle are called Triox, used in the aero space industry. They're a light weight, composite steel. May add some carbon paste if they keep slipping.shirley_basso said:I think I have the same seatpost, I have carbon braided rails and never had an issue.
I wouldn’t go any tighter if it were my seatpost.
If you’re saddle still slides with that much clamping force, something else must be wrong.
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I took that spec off a Deda ZERO 100 seat post (they both have alloy mounting hardware). Indicates 8Nm-10Nm.siddy1972 said:
10Nm on those bolts sounds very high- especially if you greased them too. I reckon mine are like 6Nm or so.jaredpurdy1960 said:
After some Internet sleuthing, I discovered the the rails on my Prologo saddle are called Triox, used in the aero space industry. They're a light weight, composite steel. May add some carbon paste if they keep slipping.shirley_basso said:I think I have the same seatpost, I have carbon braided rails and never had an issue.
I wouldn’t go any tighter if it were my seatpost.
If you’re saddle still slides with that much clamping force, something else must be wrong.
I'm going to take it out for a spin today, weather permitting, and see how it holds. I backed it off a bit with an allen key, so it's probably hovering around 8Nm. It's marked as 8Nm on the SP31.
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