Mountain bike riders running dropper posts in frames with a 38.6 mm seat tube, or anyone replacing a worn or cracked clamp.
The PRO 2-Bolt Seatpost Clamp is CNC machined from 6061 aluminium and closes with two bolts, spreading the clamping force evenly around the seat tube.
Because of that, it only needs 4 Nm of torque to hold firm. Low torque matters on dropper posts, where an over tightened clamp can squeeze the post and stop it moving smoothly.
This is the 38.6 mm size, which refers to the outside diameter of your frame's seat tube, not the seatpost. Measure the top of the seat tube before ordering.
Two bolt design
Even clamping force around the seat tube.
Just 4 Nm
Holds firm without crushing dropper posts.
CNC machined
6061 aluminium in a black finish.
38.6 mm
Sized for frames with a 38.6 mm seat tube.
Clamp
Low torque, two bolts
Two bolts spread the clamping force so the clamp only needs 4 Nm, which avoids squeezing dropper post internals.
Great for
Maybe not for
Clamp size is the outside diameter of the frame's seat tube. Measure with vernier callipers or check your frame specs. Do not exceed 4 Nm.
Fitting
Grease the bolt threads lightly and snug the two bolts evenly, alternating between them until you reach 4 Nm with a torque wrench. On carbon frames and posts, use a little carbon assembly paste instead of grease on the post.
