BSA M20 M21 Y13 G14

This is a modern cheaper equivalent of the original bearing that are very hard to get and expensive.

This bearing is slightly wider than the original bearing

To compensate for this, we supply them with a new bearing spacer/seat that is pushed into the hub.

Using these parts ensures all dimensions are correct. 

Fit these parts in the correct order.

Remove the original spacer from the hub if you haven't already so.  You will not need this again.

Fit the new spacer to the now cleaned hub.

Fit the bearing outer race into the same bore as the spacer with the tapered face pointing out.

Use a good fitting mandrel to drive the bearing race home, don't damage the bearing face or hub when fitting.

Please remember that these bearings should not be packed solid with grease, the rollers have to be able to push the grease out of the way.

Failure to observe this will shorten the life of the bearing.

Correctly lubricated they should last a lifetime.