Bontrager rear carrier for road bikes. The included mounting parts (the stainless steel parts in the photo) are sandwiched between the frame and the rear brake arch mounting bolts, and the upper part of the carrier is fixed to the frame (top). These mounting parts can remain attached even when the carrier is not in use and do not need to be removed. Note: Since the rim brake mounting bolts are used, this carrier cannot be used on bikes with disc brakes. The lower part is fixed by passing the quick-release shaft through the mounting holes. The main body is made of aluminum, and the frame mounting parts are made of stainless steel. Measured weight: 480g The length of the cargo bed is approximately 35cm, and the width is approximately 10cm at the front (near the saddle) and approximately 8cm at the rear.