Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
There's a couple of things that will happen when changing to a larger wheel
1. Speedometer becomes off
2. Rear gear ratio is effectively changed
3. ABS/Traction control will most likely not function properly
The above can be avoided by doing what is called "plus sizing" It's where a tire is used with the new larger rim so the diameter is the same as the old rim and tire.
I'll post some more info about it here