wheel dimmension

[V0rtecV8]

2003 tahoe 5,3 4wd (standard)

Hey.
Want to change out my old original bad looking wheels with some more Offroad type of wheels with BFgoodrich tires. But I dont know what dimmension who fits right on without any modifications. How big wheels can i put on?

 

[RobbysDad]

I know if you go really big or even bigger then you need to get I think it is a gear or something changed out for your speedometer. It is set for the revolutions that are stock...

Can't recall exactly what they call it, but your speedometer will not be accurate if you go with bigger wheels and do not get that changed.