Yes, think offset is what ur thinking about..
that link is not too good here are a few better ones.
http://www.usacomp.com/Offset.htm
http://toy4two.home.mindspring.com/offset.html
http://www.yokohamatire.com/utcustom.asp
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Basically offset is how close or far your tire is from the inside.
guess there is a plus or minus from where they normally are ie should be able to go out a bit and in a bit. but not too much.
Zero offset:
The hub mounting surface is even with the centerline of the wheel.
Positive offset:
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.
Positive offset is how most factory wheels are designed.
The wheel center is moves the wheel closer to the vehicle, therefore moving the tire closer to the vehicle, helping to tuck it under the fenderwell. This means the wheel rotates on its axis.
REASONS TO USE POSITIVE OFFSET WHEELS:
Less leverage on the lugs and steering linkage.
Keep tires tucked under fenderwells.
Negative offset:
The hub mounting surface is toward the back or brake side of the wheel's centerline. "Deep dish" wheels are typically negative offset.
Negative offset is how most aftermarket wheels are designed. They move the center of the wheel away from the vehicle. Therefore, moving the tires away from the vehicle, and increasing the turning radius. Rather that spinning on its axis, it swings on its axis. There are several inherent flaws with this, while they may be unavoidable. Increasing the offset puts more leverage on the lugs, which means you can break them easier, but it also increases the stance of your vehicle to help keep it more stable. The swinging affect means more lift is needed to avoid rubbing
REASONS TO USE NEGATIVE OFFSET WHEELS:
Move wheels away from vehicle, when tires are rubbing frame during turns.
Increase vehicle width, making it more stable.
Some people like the "deep dish" look the wheel offers.
also guess there is no such thing as "perfect" offset, just what came standard. from that one can go plus or minus.
the rims/ wheels are the ones who determine that, not the tires. since its the wheels that are connected to the car, the tires are connected to the wheels.
<small>[ October 10, 2004, 02:02 AM: Message edited by: Myardor ]</small>