John,
I think that, historically, many would glue the rubber tires to the wheels. There are some variables, however. State of the art today is to use urethane tires on crowned wheels - in such a scenario, the tire is actually "flat" and the underlying wheel gives it the crown. Older saws would have flat, uncrowned wheels and flat tires - gluing the tires to the wheels would allow the crown to be shaped by rotating the assembly against a sanding block or even a file. The newer urethane tires apparently grip the wheel tightly and do not need to be glued. I don't know if urethane tires are available in a crowned configuration for use with flat wheels. I also don't know if urethane tires can be shaped into a crowned configuration.
While my bandsaw is over 20 years old, it actually has crowned wheels - I think I've had to replace the rubber tires twice - when I have to replace them again, I will be going with urethane as they supposedly never dry out and crack as rubber is prone to do.
Brian