Using this AS3 rear brake disc is easy. Just install it on your KTM 85 SX or 105 SX according to the normal brake disc installation process. When it comes to braking, you'll notice better performance right away. For the best braking effect, it's recommended to use AS3 Performance brake pads together with this disc. As for maintenance, keep an eye on the ventilation slots. Make sure they're not blocked by dirt or debris, as this can help keep the disc cool. Also, check for any signs of excessive wear regularly. If you have any issues, the disc comes with a 12 - month warranty, so you can get in touch with us for assistance.