Wheel Bearing Play Inspection
1. Position a dial indicator against the wheel hub.

2. Push and pull the wheel hub by hand in the axial direction and measure the wheel bearing play.
Maximum wheel bearing play 0.05 mm {0.002 in}
3. If the bearing play exceeds the specification, replace and tighten the locknut to the specified torque and retest.
Rear axle
Wheel hub, hub spindle removal/installationMazda 6 Service Manual: Rocking the Vehicle
WARNING
Do not spin the wheels at more than 56 km/h (35 mph), and do not allow
anyone to stand behind a wheel when pushing the vehicle: When the vehicle
is stuck, spinning the wheels at high speed is dangerous. The spinning tire could
overheat and explode. This could cause serious injuries.
...
Mazda 6 Service Manual: Vehicle speedometer sensor (vss) removal/installation
Caution
Water or foreign objects entering the connector can cause a poor
connection or corrosion. Be sure not to drop water or foreign objects on the
connector when disconnecting it.
If foreign materials are stuck to the VSS, disturbance by magnetic
flux can cause sensor output to be ...