Further To 1: Fitting The Tire On The Rim

• Remove rubber residues and dried-on tire paste from the rim, especially from the rim bead and the hump.
• Examine rim for damage; remove old balancing weights.
• Use the prescribed tire mounting paste (only TIP TOP Universal, order no. 593 0601, 3.5 kg bucket, or Contifix) so that the tire does not turn on the rim the first time the car is driven, thereby counteracting all your careful work. If the tire turns by as little as 20 mm with respect to the rim, this can worsen an optimum balancing result.
• Fit tire on the rim. When doing so, it is a good idea - and even necessary in some cases - to fit the tire in a favorable position with respect to the wheel (matching). Compare Controlled and Uncontrolled matching below.

→ Use a tire filling cage.

Fig 1: Identifying Tire Filling Cage

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

• Fill tires to a maximum pressure of 4.0 bar. By the time the pressure reaches 4.0 bar, at the latest, the tire beads must pop out of the deep bed and over the hump of the rim bead in order to avoid fractures of the bead core. If necessary, interrupt the process and generously coat all necessary surfaces with sliding compound (tire mounting paste). Then repeat the process.
• Uncontrolled matching: Turn the tire on the wheel by 90° or 180° if necessary in order to achieve an acceptable value with regard to rolling smoothness (true running, imbalance and distribution of balance weights).
• Controlled matching: With a balancing machine with matching program. In most cases, this produces an even better result with regard to the rolling smoothness (true running, imbalance and distribution of the balance weights) than can be achieved with uncontrolled matching.
• Check the fit of the tire on the rim using the bead centering line.
• Set the prescribed tire pressure.