Tried a quick search- no luck: Does weight of wheels really make much of a difference?

Not so sure about that! CLOSE, but it needs to be PERFECT!

COMMON REFERENCE MILLIMETERS CONVERTS TO INCHES
Five on One Hundred 5×100 CONVERTS TO 5×3.94
Specially since most wheels are lugcentric, and not hubcentric

Putting 5x100 wheels on 5x4 hubs is asking for trouble