Tires do not come balanced from the factory. They are normally checked to be somewhat not "out of round" but the manufacturers do have an amount of play with what they find acceptable. We are a Dunlop dealer (deal many other brands as well) and find they are the worst when it comes to making sure the tires are somewhat close to acceptable when they leave the factory.
I regards to balancing, every tire is different and new tires should always be balanced when put on any rim regardless of how true you think the rim is.
