I normally cut & shape a short length of 3mm thick steel that fits inside the bearing from side to side & weld it in place with a Mig welder.
The heat from the welding heats the hub & a quick tap from the opposite side using a steel bar/ols socket extension etc removes the bearing. Remove the spacer & knock the other bearing out.
If you're quick & prepared in advance, there's sometimes enough heat in the hub to install the new bearings immediately. If not, a small gas tarch will do the job. Fit one bearing, insert spacer & fit remaining bearing.
Preparation:
Blocks of wood to support wheel rims. I have a nailed together triangle of 3"x3" timber that I use for tyre changing. Helps protect the rims & prevents disc damage.
You'll need a drift or similar to knock the new bearings in with. Something with a diameter 1mm less than the outside diameter of the bearings is ideal - sort this out in advance. A large socket can sometimes be ideal, short lengths of aluminium bar are ideal also.
Steve
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