I'm changing my spare front wheel from a 20mm to a 25mm spindle ( to match my current one ), I've found out the old 20mm bearings are 6204, 47mm x 20mm x 14mm and the new 25mm ones are 6005, 47mm x 25mm x 12mm. Therefore I have to space out the new bearings by 2mm to make the distance between the outer faces the same. This also means I have to make a new spacing shaft for between the 2 inner faces which is 4mm longer than the old one.
Confused?? Ditto!!

It's not the size of the dog in the fight that matters, but the size of the fight in the dog.
Scott #50