Seatpost clamps
The clamp tightens the top of the seat tube around the seatpost. Choose it by the outside diameter of the tube, not the post, then bolt-on to hold or quick-release to adjust the saddle without tools.
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Measure the tube, not the post
It is the most common mistake: a 31.6 mm seatpost does not need a 31.6 clamp. The clamp goes around the frame's seat tube, whose wall adds a few millimetres. So measure the outside diameter of the tube with a calliper, just below the current clamp. Hope requires a tube within 0.5 mm of the clamp size, and makes its clamps in seven diameters, from 28.6 to 39.7 mm.
Bolt or quick-release
The Seat Clamp Bolt clamps with an M6 stainless bolt and a spherical-seat nut that self-align: it is the clamp you fit once and for all, on a rigid or dropper post. The Seat Clamp QR adjusts height without tools, useful on a shared bike or when travelling. Its lever pivots on an IGUS bushing that needs little maintenance. The honest downside: a saddle on a quick-release also comes off without tools. Both share the same 2014 T6 aluminium body and the six colours of Hope rotors.
Tighten it right, especially on a dropper post
A clamp doesn't need force, it needs the right torque. 6 N·m on an M6 bolt already means around 5,000 N of tension in the bolt, half a tonne closing the slot in the tube. Beyond that, you crush a carbon post or ovalise the body of a dropper post like the KS LEV Ci, which starts to stick. Hope gives 6 N·m for the bolt version, 5 N·m with the lever closed for the quick-release, and slightly less if the post no longer slides freely. For a carbon post that slips, carbon assembly paste is better than another turn of the key. Seatposts give their own maximum torque in their specifications.
Frequently asked questions
Which seatpost clamp diameter should I choose?
The outside diameter of the seat tube, measured with a calliper below the fitted clamp. It is larger than the seatpost's, because the tube wall adds to it.
What torque for a seatpost clamp?
The clamp manufacturer's, unless the frame or the seatpost calls for less. For Hope, 6 N·m for the bolt version and 5 N·m with the lever closed for the quick release.
My dropper post sticks: is the clamp to blame?
It is a common cause: an overtightened clamp squeezes the post body out of round, and it no longer slides freely. Loosen it a little below the specified torque, as Hope allows for its clamps, and check that the post stays put.