SpdRcrChk
Spectator
Some information for those of you wantin' to learn / understand a bit more about offsets, camber, hubcentric rings, etc. There's a nice little offset calculator link at th bottom too. :thumbup:
WHEEL OFFSETS
Information provided by TireRack.com
OFFSET
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.
Zero Offset
The hub mounting surface is even with the centerline of the wheel.
Positive
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.
Negative
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. Our extensive database allows our sales staff to offer you the perfect fit for your vehicle
HUBCENTRIC RINGS
Information provided by JustForWheels.com
Hubcentric rings are designed to fill in the gap between the hub of the car and the center bore of the wheel. Most wheel manufacturers design their wheels with a center bore large enough to fit on most cars. Therefore, since wheel manufacturers make their center bore large enough to fit most cars, most wheel fitments have a gap between the hub and the center bore. This gap usually doesn't allow for the wheel to fit hubcentric but rather lugcentric which causes vibration. Therefore, to fill the gap and ensure the fitment is hubcentric, hub rings are used.
Also Helpful:WHEEL OFFSET CALCULATOR
http://toy4two.home.mindspring.com/offset.html
WHEEL OFFSETS
Information provided by TireRack.com
OFFSET
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.
Zero Offset
The hub mounting surface is even with the centerline of the wheel.
Positive
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.
Negative
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. Our extensive database allows our sales staff to offer you the perfect fit for your vehicle
HUBCENTRIC RINGS
Information provided by JustForWheels.com
Hubcentric rings are designed to fill in the gap between the hub of the car and the center bore of the wheel. Most wheel manufacturers design their wheels with a center bore large enough to fit on most cars. Therefore, since wheel manufacturers make their center bore large enough to fit most cars, most wheel fitments have a gap between the hub and the center bore. This gap usually doesn't allow for the wheel to fit hubcentric but rather lugcentric which causes vibration. Therefore, to fill the gap and ensure the fitment is hubcentric, hub rings are used.
EVO77 from SRT forums said:If you are going to purchase new wheels its probably a good idea to purchase hub rings as well. This will ensure that the center bore of the wheel sits flush on the hub and will avoid any vibration that may occur while driving.
There are two kinds of hub rings that can be purchased: plastic and aluminum. Some say that excessive heat from braking can cause the plastic rings to melt and warp over time. Metal rings seem to be the weapon of choice for most. To determine which size hub rings you'll need for your aftermarket wheels, first find out from the manufacturer what the center bore diameter is. This number combined with the SRT-4 hub size of 57.10 will be the size you need for your hubcentric rings.
Example: 73.0 x 57.1
Metal hub rings can be purchased from Discount Tire Direct for about $15 shipped. All you need to do is just give them the size you need.
1-888-459-4081
Mike Ext. #304
Also Helpful:WHEEL OFFSET CALCULATOR
http://toy4two.home.mindspring.com/offset.html