ball bearing size and sources?

lugsey2k5

hello
i was wanting some new ball bearings for mainly my rear hub but if there cheap ill replace front 2.
i was wondering what the dimentions are and where can i get them from as i do not have a micromiter or vernierguage. think thats how its spelt.
they are :
Front hub : KK Disc
Rear hub : Shimano FH-M475 disc

thanks

ps. were is the spell cheak function im sure there used to be one and seem to have lost it some how

nicklouse

from parktools

For rear hubs, the common number is 9 balls of 1/4-inch diameter per side. For front hubs, the common number is 10 balls of 3/16-inch diameter per side.

lugsey2k5

thanks didnt think to look on parktools