OFFSET
Just because the wheel centers correctly doesn’t mean that it fits correctly. This means that the offset could be wrong. The offset is the location of the flat mounting surface of a wheel relative to the wheel’s centerline. A negative offset indicates that the mounting surface is toward the center of the car, and a positive offset that it is toward the outside of the car. It will appear that the wheel is pulled in toward the center. Offset will lead to more problems than just making the wheel appear to be sticking out of the fender. It can lead to rubbing problems when the suspension is compressed or the wheel is cut to turn. Offset also affects the steering geometry’s scrub radius, possibly leading to problems with the torque steer or the self-centering characteristics.
Offset can also affect the suspension’s motion ratio, which determines directly the effective spring and damper rates. In a heavily loaded vehicle, offset can potentially affect wheel bearing life. This problem though is seen more in trucks than in smaller cars. This is why using the proper offset wheels are essential.
Brake caliper clearance also comes into play when discussing offset. When choosing a set of wheels, it is important to make sure that the ones you choose do fit over the calipers. Spacers are available to alleviate this issue, but it is recommended to purchase a set of wheels that do cover the calipers and meet the offset specifications. You can be sure of this by contacting your wheel and brake manufacturers. Some aftermarket brake companies will provide you with a template of their brakes for you to check against your prospective wheels.
Hope this helps! Yes the +24 is a deeper offset than the +36. The +36 is sucked out toward the outside of the car more.
