I think I've finally made up my mind and am thinking about purchasing these Falken Koblenz wheels. I don't know what bolt pattern and offset ill need though. I thought the bolt pattern was something like 5-114, but im not sure. Any help would be much appreciated. Also, I want to wrap them in BFGoodrich G-Force KDW2, probably P255/45ZR19, so would 19 x 9.5” be the best size to use? Thanks


Here are the sizes of the 19s:

75433031 machine/gm 19x10.5 5-114.3 30mm
75433032 machine/gm 19x10.5 5-114.3 10mm
75433007 machine/gm 19x8.5 5-120 38mm
75433008 machine/gm 19x8.5 5-112 35mm
75433009 machine/gm 19x8.5 5-114.3 35mm
75433010 machine/gm 19x8.5 5-100 35mm
75433011 machine/gm 19x8.5 5-114.3 25mm
75433012 machine/gm 19x9.5 5-120 45mm
75433013 machine/gm 19x9.5 5-112 35mm
75433014 machine/gm 19x9.5 5-114.3 42mm
75433015 machine/gm 19x9.5 5-114.3 35mm

 

Just so you know, BF goodrich does not make those tires in that size. I assume you mean to say 255/40/19 at that would be the correct size. those size the 255/40/19s are the old tread design just so you know. If you want to have a bulge, go with an 8.5 width rim, if you want it to be more flush, go with the 9.5. Your bolt pattern is 5-114.3. You will want to get the highest positive offset listed there depending on which width you go with.

 

Front:
75433009 machine/gm 19x8.5 5-114.3 35mm
Back:
75433015 machine/gm 19x9.5 5-114.3 35mm
This is what I would do...

 

I was thinking about getting the same rim. So when you say buldge do you mean the rim sticking out of the fender? I'm looking to keep things flush with the side of the car and figured the 9.5 might stick out farther. I'm assuming the 35mm offset is better then the 42mm?

 

What is the advantage by having a front tire that is more narrow? Is it just for looks because I'd rather be able to do a front to back rotation.

 

if you would rather do the rotation, and your not too concerned w/ having better traction in the rear. (hence wider tire out back) then 19x8.5 all around sound good. Are you going to drop the car at all?. 45 percent tires might be too tall. Id go with 265/35's

 

Well actually I wanted to do 19x9.5 all around like the Shelby show car. I'd probably drop it with the pro kit. Are my front tires going to rub?

 

Thanks for all the input guys. How does 245/40ZR19/RF for the front and 285/35ZR19 for the rear sound? Someone already told me this size on the GT Tech forum and says it works real good for him, so I think I'm goin with this setup.

bpmurr, I don't think you'll have to worry about rubbing with dropping the car. I plan on doing the same with the Eibach pro kit and have been told with this rim/tire arrangement the diameters and such are near stock

 

I was thinking about getting the same rim. So when you say buldge do you mean the rim sticking out of the fender? I'm looking to keep things flush with the side of the car and figured the 9.5 might stick out farther. I'm assuming the 35mm offset is better then the 42mm?
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Wheen i say bulge, i mean that the tires would stick be wider than the rim, it makes the wheel the entire thing look like it has more depth to it. When it doesnt bulge, the tire will not be much wider than the wheel.

 

The problem with that tire size is that it is considerably smaller than stock. This means that your fender gaps will increase and you may not like that look, i would reccomend going with the 255/45 in the front, and 295/40 in the back to give you a bit more sidewall. Lowering the car will help in the gap from the top of the tire to the fender, but not on each side of the tire.

 

The problem with that tire size is that it is considerably smaller than stock. This means that your fender gaps will increase and you may not like that look, i would reccomend going with the 255/45 in the front, and 295/40 in the back to give you a bit more sidewall. Lowering the car will help in the gap from the top of the tire to the fender, but not on each side of the tire.
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Well if I go with 19x9.5 all the way around wouldn't I want to keep the tire size the same? I want to make sure I don't have to do a speedo recal. If there is a better tire setup then were can I get the speedo recalibrated.