When selecting replacement brake rotors for a gravel bike, there are a few key considerations to keep in mind. First and foremost is the rotor size, which must match the size of your bike's brake calipers. The most common rotor sizes for gravel bikes are 140mm and 160mm, but some bikes may be compatible with larger or smaller sizes.
Another important consideration is the type of rotor. There are two main types of brake rotors: solid and vented. Solid rotors are less expensive and are suitable for most gravel bike applications, while vented rotors are more expensive but offer improved cooling and are better suited for more demanding riding conditions.
When it comes to removing the old rotor and installing the new one, it is important to ensure proper brake caliper alignment to avoid damage to the surrounding components. This can be done by loosening the brake caliper mounting bolts, squeezing the brake caliper so that the new rotor is properly centered, and then tightening the mounting bolts to the recommended torque specification.
It is also important to use a rotor truing tool to ensure that the rotor is true and free from warping or bending. This will help to ensure even braking performance and prevent premature wear on the brake pads.
Lastly, it is recommended to use a brake cleaner to clean the brake caliper and rotor surfaces before installing the new rotor. This will help to remove any dirt, debris, or oil that may have accumulated on the surfaces, which can negatively impact brake performance.
Overall, by considering the rotor size, type, and ensuring proper caliper alignment and truing, you can ensure a successful rotor replacement process for your gravel bike.