What size are the bearings for the 700c Rev X wheels? I have a slight grinding noise in the rear wheel. I want to replace the bearings but dont want to deal with the great customer service of Spinergy.....thanks!

Are these cartridge bearings? If so, they are often marked with the size or a part number on them. Otherwise, you can measure them. If they are loose bearings, then you can see what size they are pretty easily.

I was hoping someone knew the answer to that with sizes etc..if there was a standard size...