Rear wheel bearing diagram

What year miata?

The bearing is pressed in so you will have to carry the hub to a machine shop to have the old bearing pressed out and the new bearing pressed in once you have the hub off the car.

Process to remove hub is as follows (from the 1990 Miata Service manual)

Remove rear wheel, rear wheel brake caliper assembly (suspend with a rope), and disc plate.

Check for rear hub play with a dial indicator, if excessive play either tighten the locknut or remove hub and replace bearing.

To remove bearing bend up the locknut stake and remove axle nut - torque is between 159 - 217 ft pounds.

Now remove the hub, retaining ring, rear wheel knuckle, wheel bearing (if loose), dust cover.

Replace with new parts, locknut, dust cover, knuckle bushings and hub bolts (if worn).

Take knuckle with wheel bearing to machine shop and have old bearing pressed out and new bearing pressed in.

Assembly is reverse of the above.

I have personally found that by the time I pay a machine shop to do the removal and reinstall of the bearing and take my time into account it is less expensive to pay a good shop to do this work for me.

DIY information at Miata.net