Seat post clamp

[nickg]

After about 25 miles of ridding my seat clamp becomes slightly loose causing a creaking noise. I've tightened it up several times with a bike multi tool and pretty tight. The clamp has a little white arrow on it which I assume points towards the front? How tight should the clamp be? Anybody know a torque or is there something I'm missing? It's a Wilier Montegrapper road bike.

 

[al-fresco]

I'd go for about 6nm. That's the recommended torque on my Wilier Izoard. Not sure about the white arrow as Wilier have a habit of putting a Halberd head on just about every component so it could be that.

 

[nickg]

Ok. I will take torque wrench home tonight. It's really bugging me.

 

[Smokin Joe]

They don't normally loosen in use if you've nipped them up tightly. I'd suggest a poor fitting thread, maybe try another clamp?

 

[nickg]

It does seem strange. Never had it happen before. I've just started upping my mileage and it's being a pain.

 

[Cubist]

Use carbon assembly paste on the post and coppaslip on the bolt. If that doesn't fix it, as above, try another clamp.

 

[ayceejay]

If your frame has a slot cut into it where the seat post goes in have the bolt on the opposite side.

 

[nickg]

Can I get carbon assembly paste from any bike shop?

At the moment my bolt for my clamp goes across where the slit it for the seat post on the frame. Is this incorrect?

 

[Sittingduck]

Quite easy to overtighten these and break the bolt. They probably don't need as much torque on the bolt as you think.

 

[nickg]

So would you say 6nm as per previous comment above.

 

[Sittingduck]

So would you say 6nm as per previous comment above.

I certainly wouldn't go more than 6. if you Google image search seat post clamps you can see the nm ratings on a number of the images. 5-6 sounds about right. Just don't overtighten.

 

[ayceejay]

Can I get carbon assembly paste from any bike shop?

At the moment my bolt for my clamp goes across where the slit it for the seat post on the frame. Is this incorrect?

Try turning it 180 so that the bolt is in front, use the paste and tighten to 3nm/

 

[Smokin Joe]

Quite easy to overtighten these and break the bolt. They probably don't need as much torque on the bolt as you think.

The smaller bolts supplied with most clamps now will strip their threads at around 5Nm.