Wheels for 4.6...Offsets???

[rjs852]

From what I have read the stock 4.6 wheels are a +39 offset. Because of the 4 piston calibers up front any aftermarket wheel should be of the same offset. Is this correct? Or will wheels with a lower offset fit? Say +20 or +35. Please Help!!!

 

[nearwater]

Offset is a key spec to determine the fitment of a wheel on a car.
However, even a wheel with the same offset could or couldn't fit the car depending on spoke designs.
You're gonna need a template(of the rotor/caliper or the wheel) to see if it would fit or not.

Dan

 

[motorsportsauthority]

Wheel design with have to be considered when looking at finding new wheels just because of our larger calipers up front. BUT, here's an explanation of what offset means since it seems you're confused.
http://www.tirerack.com/wheels/tech/techpage.jsp?techid=101

Basically, if you're at a +35, adding a wheel that's 1.5" wider, I'd probably go to a +20ish wheel.

 

[Disaster]

Offset is a key spec to determine the fitment of a wheel on a car.
However, even a wheel with the same offset could or couldn't fit the car depending on spoke designs.
You're gonna need a template(of the rotor/caliper or the wheel) to see if it would fit or not.

Dan

Yes, the offset is how much the centerline of the wheel is behind the front mounting surface. More offset places the wheel more inboard and therefore the back of the rim and tire are closer to the car. More offset usually effects the suspension more than the brakes since the brakes sit inside the wheel, not behind it, like the suspension does. Having too little offset pushes the wheel and tire outward and can cause the tire to hit the fender lip. With brake clearance the inside of the wheel is the most important...especially right at the mounting surface and the corner, where the mounting surface plane meets the inside of the rim.

 

[rjs852]

When you say "More" offset you mean + offset. I would think that would move the wheel further outboard away from the calipers & suspesion not closer. The factory 4.6 wheels have a high + offset, isn't that I would want to look for?

 

[motorsportsauthority]

Go to that link I posted. The closer the offset is to "0" the more centered your wheel will be on the car. For example, a 0 offset on a 10" rim would leave 5" into the car and 5" towards the fender. So if you have a factory offset of +35 and you add 1.5" to the car, you're then looking for a +22ish offset because you're wanting to bring more of the wheel towards the fender. If you added 1.5" to the wheel width and left it at the factory offset, you would be 1.5" closer to the car.

 

[Disaster]

When you say "More" offset you mean + offset. I would think that would move the wheel further outboard away from the calipers & suspesion not closer. The factory 4.6 wheels have a high + offset, isn't that I would want to look for?

Like "Motorsportsauthority" said, look at the TireRack link. Positive offset is measured from the mounting face on the hub INWARD. So more offset moves the wheel more inward.

Going with wider wheels, might require a different offset, as MSA also suggested, but not necessarily. It all depends on how much clearance you have to the fender vs. how much clearance you have to the suspension. You don't want to hit either. When people upsize their wheels they will sometimes "roll" the fenders (bend the lip of the fender in to create another 1/2" of room...sometimes even deform the fenders more outward.) The Genesis fender lips are already turned in.

[ame="http://www.youtube.com/watch?v=DDTK9IjKIYU"]YouTube- diy fender rolling[/ame]

and here's a guy that actually seems to know what he is doing, using a special rolling tool.

[nomedia="http://www.youtube.com/watch?v=_irPKDRxufc"]YouTube- rolling the 8's fenders[/nomedia]

the tool instructions.

[ame="http://www.youtube.com/watch?v=PqiTfYyaI1A"]YouTube- Rolling Your Fenders w/Eastwood Fender Roller[/ame]