Replacing a run-flat technology or UHP tires (M4 Coupe)
It is absolutely essential to ensure that the equipment is in proper working condition and that there is no damage to the disc wheel and tire.
Balance WHEELS after completing work.
UHP tire = Ultra High Performance tire
UHP tires are tires with an aspect ratio (H:B) ≤ 45% or tires with a speed index ≥"V".
Attention!
For installation and removal work on run-flat tires and/or UHP tires on certified and approved tire fitting machines, the following successful training for the "Certified BMW tire fitter" or equivalent is required.
For the installation run-flat tires and/or UHP tires, only tire fitting machines approved and certified by WDK (Wirtschaftsverband der deutschen Kautschukindustrie) (German rubber industry) may be used.
Please refer to the operating instructions of the respective tire fitting machine for details of the exact fitting procedure.
Use only BMW-approved plastic-covered mounting levers!
Use only BMW-approved tire-fitting paste (BMW Tire fitting paste, part number 81 22 0 433 046).
When tire sealant is used, the installed wheel electronics must necessarily be replaced.
Attention!
Pirelli tires can happen to have two little holes in the tread pattern!
These two holes are production-related!
The presence of these two little holes in the tread pattern does not represent a fault and does not affect the performance and the efficiency of the tires in any way!
- Position (1) identification of BMW-approved tires. Make sure that only BMW approved tires are fitted
- Position (2) RSC is the abbreviation for R un-flat S ystem C omponent (run-flat tires)
- Position (3) Outside means outer side. The tire must be fitted so that the wording Outside is always situated on the outside of the rim
Attention!
Many tires are directional!
The arrow on the tire must point in the "Forward" direction of rotation!
Attention!
Before removal:
- Maintain tire air temperature of approx. +23°C. Refer to RECOMMENDATION FOR HEATING .
- Clean wheel/tire unit
- Remove valve insert (deflate tire)
- Remove present balance weight
Observe before installation:
- Maintain tire air temperature of approx. +23°C. Refer to RECOMMENDATION FOR HEATING .
- Clean wheel/tire
- Check wheel rim for burrs, wear and other damage
- Clean tire beads and check for evidence of damage
- Check the wheel electronics for damage
- The aluminium screw valve must be replaced at the disassembly of the wheel electronics
Filling/inflating tire:
Remove all fitting aids.
Attention!
Possibilities for safely mounting the wheel or incorporation in inflation apparatus should be utilized.
Observe instructions/conditions of trade association.
Observe national regulations!
Inflate with air (without valve insert).
- Increase pressure up to 3.3 bar in stages (fitting pressure).
- If the tire bead does not slip fully past the rim edge all round, do not under any circumstance increase the pressure.
- If necessary, release air and force off tire bead again.
- Coat rim flange and tire again with tire mounting paste (BMW Tire fitting paste, part number 81 22 0 433 046).
- Inflate tire again up to 3.3 bar.
- When tire beads are resting perfectly on rim shoulders, increase tire pressure to no more than 4.0 bar (settling pressure) to "settle" the tire; in M vehicles, increase to no less than 4.0 and no more than 4.5 bar.
To achieve perfect embedding of the tire into the wheel rim, the settling pressure (4 - 4.5 bar) must be maintained over a period of at least 15 minutes.
Screw in valve insert and correct the tire pressure.
Optimize the tire bead (1) fit on the inside and the outer side after inflating the tire.
The tire bead must lie flush against the wheel rim without air pockets. This optimizes the smooth running of the tire.
Gently press in the tire sidewall and the wheel rim with the unseating roller (2).
Rotate the wheel, the air between the tire and wheel rim escapes.
Balance the tires.
Observe the information for the initialization of the TIRE PRESSURE CONTROL (RDC).
Attention!
Advise the customer to avoid heavy acceleration and heavy braking in the initial period.
The assembly paste can cause the tire to turn on the wheel rim and give rise to imbalance.