The offset of a wheel is the distance from its hub mounting surface to the centerline of the wheel. The offset can be one of three types.
The hub mounting surface is even with the centerline of the wheel.
The hub mounting surface is toward the front or wheel side of the wheel. Positive offset wheels are generally found on front wheel drive cars and newer rear drive cars.
The hub mounting surface is toward the back or brake side of the wheels centerline. "Deep dish" wheels are typically a negative offset.
If the offset of the wheel is not correct for the car, the handling can be adversely affected. When the width of the wheel changes, the offset also changes numerically. If the offset were to stay the same while you added width, the additional width would be split evenly between the inside and outside. For most cars, this won't work correctly. We have test fitted thousands of different vehicles for proper fitment.
go FAST - 1999 Kawasaki Green Ninja ZX6R (G Variant) - Yoshimura RS3, Harris grips, spike bar ends BALD tires
go SLOWER - 2006 Ford Focus (FoFo) - Eclipse CD7000 HU, Memphis MOJO 15", USamps 2000x, Memphis 16v line driver, Polk DB570'* PPI 4420 amp