My thoughts...
- Spacers can improve the look of stock wheels by making them more "flush" with the fenders.
- Spacers may also improve some aspects of handling by giving your car a wider stance.
- Spacers will change your suspension geometry, which can negatively affect other aspects of handling, since the offset is calculated in the manufacturer's suspension design.
- Be sure to measure to make sure you're getting the right size of spacers all around. If you go too big, you may rub your fenders and have to trim, due to negative offset changing your suspension geometry.
- Hubcentric spacers (used for hubcentric wheels) maintain a true center for the wheels, which makes for better wheel balance. The VehiCross does not have hubcentric wheels, so spacers will make balancing difficult. You should get the wheels balanced on the car (after they're mounted) if you're gonna use them.
- In general, it's better to get aftermarket wheels than to use spacers. Going with a wider wheel with the OEM offset will increase contact patch and give you a wider stance with no negative effects.
I have 10mm front and 20mm rear hubcentric spacers on my Audi TT. I'm running 18x8.5 Fikse Profil 10 3-piece wheels. Even though the balance and handling is fine with the spacers, I'm thinking of getting a new outer lips to make them 9" wide front and 9.5" rear staggered and lose the spacers when I wear through my tires.