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Excuse the ignorance but what is a "FR vehicle"?
Smaller wheels/tires will lower the vehicle but will also lower the effective gear ratio if you make the drive wheels smaller.
If the wheels are 1" smaller in diameter your vehicle will drop 1/2"
Smaller lighter wheels have less inertia and will accelerate quicker.
Make sure the new rims clear the brakes and the tires can handle the weight of the vehicle.
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