HPI blitz bearing question

[racingdwarf]

Hi all

Have a blitz that a play with a bit at club, after running it in the wet last week I now need to replace rear hub bearings now the book states these are 5x10x4, good stuff as I have loads of them, but when I set about replacing them they are way to small the outer diameter of the removed bearing is more like 11mm when measured with a micrometer.

can someone who has replaced them confirm the size for me pls, just to be 100% right before I order some up

Many thanks