Bike Forums - View Single Post - Seatpost clamp torque limit

06-09-22, 10:45 AM

#5

easyupbug

Senior Member

Join Date: Jan 2013

Posts: 2,685

Bikes: too many sparkly Italians, some sweet Americans and a couple interesting Japanese

Mentioned: 10 Post(s)

Tagged: 0 Thread(s)

Quoted: 569 Post(s)

Likes: 487

Liked 595 Times in 412 Posts

Quote:

Originally Posted by force10

Is it there to protect the seatpost or the frame?

I am replacing an alloy seatpost with carbon (round, 27.2) on a carbon frame bike. Manufacturer recommended max is 6nM for the OEm aluminum post. Does this hold for the carbon replacement?

Thanks

In my brief time as a design engineer we would set max torque for the assembly, which would include the frame and post materials and what max torque the set screw could take in the clamp. A change in the post material certainly could reduce the max and the suggestions above are reasonable. I suspect there may be carbon posts that could take 6Nm and many that might fail at far lower than 6 Nm.

Reply