Andrew Avis
I have not had much success with pulling wheels out and tend towards fitting Gibson’s.
The lack of meat left on the axle is one problem that has been identified above. This seems to be less of a problem with non-steam outline models.
The other is the wheel profile. First the OO wheels tend to be a lot thicker thus reducing the amount of space you have inside the splashers/body/frame. The second problem is that the flanges are deeper and tend to run over the chairs of the track. and the third is that the thicker flanges can give you problems with crossing flange clearances on turnouts.