Box Components Box Two Seat Clamp

A fixed seat clamp uses a bolt to secure the seatpost in place, rather than a quick-release lever. This design is generally lighter, more secure, and less prone to theft, making it ideal for riders who don't need to adjust their saddle height frequently.

The 31.8 mm measurement refers to the outer diameter of your seat tube, not the seatpost itself. You can verify your required size by checking the specs on your bike frame manufacturer's website or by measuring the outer diameter of your seat tube with a pair of calipers.

Yes, this clamp is compatible with carbon seatposts, provided you use the correct torque settings. Always use a torque wrench to tighten the bolt to the manufacturer's recommended specification to avoid crushing or damaging the carbon material.

While the tapered rear edge is primarily designed to give the clamp a cleaner, more streamlined look, the machining process used to create it also helps reduce unnecessary material weight without compromising the clamp's structural strength.

You will need a standard hex key (Allen wrench), typically a 4mm or 5mm depending on the specific bolt head, to install and tighten this clamp. We recommend using a torque wrench during installation to ensure the bolt is tightened to the correct specification.