Tire changing is the controlled removal and installation of a tire while protecting the tire, wheel, valve, sensor and technician.
Identify tire and wheel construction first.
Fully deflate before bead breaking.
Keep the opposite bead in the drop center.
Inflation is a separate high-energy stage.
Pre-service inspection
Record size, service description, direction, inside/outside markings and wheel condition. Locate TPMS and identify structural damage before beginning.
Using the drop center
The opposite bead must remain in the wheel drop center so the working section can pass over the flange without excessive stretching.
Inflation and verification
Use approved lubricant and safe inflation procedure. Confirm bead seating, operating pressure, leaks, balance and final wheel torque.
Diagnostic reference
| Finding | Possible meaning | Next check |
|---|---|---|
| Bead will not move | Drop center lost | Reposition bead |
| TPMS damaged | Sensor location ignored | Control rotation |
| Rim scratched | Head contact or debris | Reset and protect |
Workshop procedure
- Inspect and identify assembly.
- Remove valve core and fully deflate.
- Break both beads away from sensor.
- Demount using drop center.
- Inspect and lubricate.
- Mount in correct orientation.
- Seat beads safely.
- Leak-test and balance.
Frequently asked questions
Why remove the valve core?
It allows complete deflation before bead breaking.
Why is the drop center essential?
It creates the clearance needed for the bead to pass the flange.
Should the assembly be balanced afterward?
Normally yes.
Technical review edition · Published 17 July 2026.