for the price of a few bucks 9 times out of 10 if caught on the road the outer housing will support the new inner race to get you home where you can put in a complete new set. i have seen trailers come in with no inner race cage left and they still managed a 100 ks on them . its not uncommon for poor quality hubs sold with a ring of locite round the outer race to hide poor workmanship caused by a slightly worn tungsten chip on a automatic lathe best bet is to heat them than cool them by squirting around the tapered face quickly and usually with a light tap they fall out. its the same principle as the ring of weld, the cooling contracts the ring in.