Since I had my wheels refurbed I have not yet gotten round to putting the decorative bolts into them, as such the wheels were balanced without them. When I put the studs in (10 per wheel, equally spaced) will I need to have them rebalanced does anybody know?

I've always assumed that I will but somebody asked the other day how wheel balancing works, is the imbalance measured across the width of the wheel or around it's diameter? If it were across the width then they would need rebalancing, but across the diameter of the wheel they should theoretically be ok?