Sunlite Rack Seat Clamp

You need to measure the outer diameter of your seat tube, not the seat post itself. Using a digital caliper is the most accurate way to get this measurement, which will correspond to one of the available sizes: 28.6mm, 29.8mm, 31.8mm, or 34.9mm.

Yes, this component serves as both your seat post binder and a mounting point for a rear rack. You will need to remove your current seat post clamp before installing this one.

We generally advise against using aluminum clamps on carbon fiber frames unless the manufacturer specifies that the frame is compatible with metal-on-carbon clamping. Always check your frame manufacturer's torque specifications to avoid damaging the carbon.

The integrated mount is designed to work with most standard racks that attach to the seat post area. However, ensure your rack's mounting arms have enough adjustability to reach the clamp's attachment points comfortably.

Installation typically only requires a standard hex key, or Allen wrench, to tighten the bolt. It is a straightforward swap for most riders, though you may want to apply a light layer of grease to the bolt threads before tightening.