GM Service Manual Online
For 1990-2009 cars only
  1. NOTICE: Recommended vehicle tire mounting and inflation procedures are especially important with radial tires. Failure to follow these procedures can cause bead deformation due to incorrect bead seating. Bead deformation may lead to chafing, lower sidewall and bead area cracking, eccentric wear, ride vibration and non-retreadable casings.
  2. Important: 

       • This procedure must be followed to insure the proper bead seating in order to prevent bead deformation.
       • Radial tires must be mounted and inflated in accordance with the safety precautions noted in RMA Radial tire and Bias Truck tire Service Manuals.
       • The use of tubes in tubeless tires is not a recommended repair because speed ratings are greatly reduced.

  3. Use only rims approved for radial tire usage by the rim manufacturer.
  4. Clean the rim.
  5. Lubricate the tire beads and the rim bead seats with an approved rubber lubricant.
  6. CAUTION: Do not use silicone base lubricants. These lubricants can cause the tire to slip on the wheel and possibly cause personal injury.

  7. Inflate the tire to the correct pressure.
  8. • It may be difficult to get the tire to take air, particularly in the lower sidewall and the bead are, due to the construction or radial truck tires.
    • An inflation aid may be necessary in order to help seat the bead of tubeless radial tires. Two types of inflation aids are commercially available. The first is metal rings which use compressed air in order to seat beads. The second is rubber rings which seal between the tire bead and the rim bead seat allowing the bead to move out and seat. Lubrication is necessary with both aids.
  9. Check the spacing between the rim flange and one of the three lower sidewall rim line rings while the tire is laying flat in order to verify bead seating.
  10. • The measurements must be taken each 90 degrees around the circumference of the rim flange.
    • Repeat steps 1 through 3 if the spacing is uneven around the bead from side to side.