Tire Iron BeadBrakR slide show - BestRest
Your knee is also helpful to push the tire away from the rim.  When doing this I'm being careful that I don't damage the disc.  

In some cases you may need to put small blocks under the rim to keep the disc off the ground

Your knee is also helpful to push the tire away from the rim. When doing this I'm being careful that I don't damage the disc.

In some cases you may need to put small blocks under the rim to keep the disc off the ground