19x11 on the front. Offsets???

[GLEE]

Hello guys, ive been searching around finding alot of info. I want to run a 305 30 19 setup. I have stock suspension and will max negative camber on the front to tuck the wheel in. I have found alot saying it is possible but no real offset numbers. I am looking for anyone that has a 19x11 on the front to share their offset. Im trying to run this with the least amout of tire sticking out thats why im not just going with the z28 19s. Thank you all for your time, looking forward to hearing any info you guys can give.

[The_Stache]

Your best bet is going to be going to a vendor, most wont give up their offsets publicly and rightfully so, they have put the time, money, and effort into making wheels fit. And even with generic offsets some wheels just don't have the caliper clearance.

That said you wont get a 19X11 to fit inside the front well completely with the stock suspension, Period. There's just not enough space or adjustability. Requires a custom setup (coilovers, camber plates, ect...)

Its possible if you don't care about it sticking out past the fender however. Just have to run a very low profile tire to make sure the travel/load doesn't hit the fender, and even then you WILL rub on full lock.

[Zombie killer]

Offset could also be determined by the style of wheel you select. I am currently running a 19x11 upfront with no rubbing at all so it is possible. I am also on 1" lowering springs and running camber plates to gain the negative camber I want. Now the 305s do still poke out some but since I don't use them as my DD it's no big deal for me. Although my local tire installer did cuss when he tried to mount them, I did go with a 30 series tires.

[cdb95z28]

GLEE, Where in PA are you?

[GLEE]

Originally Posted by cdb95z28

GLEE, Where in PA are you?

Around Harrisburg

[GLEE]

Originally Posted by Zombie killer

Offset could also be determined by the style of wheel you select. I am currently running a 19x11 upfront with no rubbing at all so it is possible. I am also on 1" lowering springs and running camber plates to gain the negative camber I want. Now the 305s do still poke out some but since I don't use them as my DD it's no big deal for me. Although my local tire installer did cuss when he tried to mount them, I did go with a 30 series tires.

How much camber are you running? How far do they stick out? Thanks for the picture

[GLEE]

Originally Posted by The_Stache

Your best bet is going to be going to a vendor, most wont give up their offsets publicly and rightfully so, they have put the time, money, and effort into making wheels fit. And even with generic offsets some wheels just don't have the caliper clearance.

That said you wont get a 19X11 to fit inside the front well completely with the stock suspension, Period. There's just not enough space or adjustability. Requires a custom setup (coilovers, camber plates, ect...)

Its possible if you don't care about it sticking out past the fender however. Just have to run a very low profile tire to make sure the travel/load doesn't hit the fender, and even then you WILL rub on full lock.

I am in contact with forgeline, waiting fora reply. I fully understand that to have the 11 on the front i am going to have some poke. Im trying to minimize this as much as possible. I plan on running 30 profile tires

[cdb95z28]

I'm in the same boat as you, looking to do 19x11's with 305/30's. I'll share what I've found maybe tonight. If I was patient, I can do Forgelines in the fall.

[cdb95z28]

What is your current wheel/tire sizes, offset too?

[cdb95z28]

I saw your other thread looking for info. The Z/28 rears are not 26mm offset, this keeps getting repeated, and it is wrong. Picture of rear Z wheel, ET 32.25

[GLEE]

Originally Posted by cdb95z28

I saw your other thread looking for info. The Z/28 rears are not 26mm offset, this keeps getting repeated, and it is wrong. Picture of rear Z wheel, ET 32.25
Attachment 866855

From everything ive read so far. I am thinking +17 front and +40 rear for a 19x11. I am working on putting it all in one of those simulators that will show the change in all aspects

[cdb95z28]

We can use my 1LE wheels/tires for example.

I am running 2.4* of front camber (no camber plate) and have about 7mm of clearance from the tire to the strut. Justice Pete has always stated a #2 pencil as a good gauge for clearance. Knowing this we don't want to get any closer to the strut with the max camber. So we have to push all extra width out to the fender.

I use this page for wheel comparisons:
http://rimsntires.com/specspro.jsp
It takes into account the role of the tire in any clearance issues. Some calculators do not do this. And remember some tires actually are wider for any given size, so that variable comes into play. But do not discount the wheel's role, as on the Gen 6's, the wheel may be the first object to cause an issue. So while this calculator is great, it is not a be all end all on dead nuts fitment.

A 19x11 with an offset of ET13 will get real close to matching the 1LE front tire to strut clearance, but sticks out about 20mm. 20mm will poke just a tiny bit with -2.4* camber. I've seen bits of info on custom 19x11's coming in at about 17 to 20 mm offsets. That's not to say they are not using other offsets, that is just what I have found listed here on the forums and elsewhere. Most if not all vendors who sell Forgelines will not divulge the offset info, and I understand that. They did the homework on proper offsets.

If we use a camber plate, we can get most of our camber via the plate and we rely less on the OE point of adjustment at the spindle/strut. This helps the tire to strut clearance because it forces us to pull the spindle (and tire)away from the strut. So we could get a wheel with an offset like 20mm, which on paper puts the tire 7mm closer to the strut, and only 13mm at the fender (less poke). This only works if the use of a camber plates creates atleast 7mm more clearance.

I've added longer studs in case I need to use small spacers for fine tuning. An offset of 20mm may work for me since I could use a 7mm spacer effectively making the wheel a 13mm offset. But If I reinstall my camber plates I could fine tune using thinner spacers if needed, causing the tire to sit into the wheelhouse better with less poke.

Take the above info and apply it to the rear. An offset on the rear of about 40mm on the 19x11 wheel/305 tire also pulls the wheel out by about 13mm at the fender (similar to the front offset of 20mm). Inner clearance is not as big a problem in the rear, but with the ET40 offset we are safe since we know the ZL1 uses a 305 tire on a 11" wide wheel with a 43 mm offset. Very similar.

If we had to use a 7mm spacer up front for good strut clearance, we would also use a 7mm spacer at the rear making the effective rear offset of 33mm, this would push the rear tire towards the fender lip. Compared to the OE 1LE rear wheel/tire combo, the poke is 20mm.


Realistically we want to match the front's track/tread width, which is the outside of the left tire measuring over to the outside of the right tire. This is not a huge deal but the front to rear balance could slightly change. I do not have any experience on how much difference of the front and rear matters.

[cdb95z28]

I mocked up "wider wheels" with my OE 1LE wheels. I spaced them out 20mm to duplicate the theoretical change of going with a 19x11 ET13 and ET33.
Poke at front:


Poke at rear:


Damn, pics went sideways

[cdb95z28]

Originally Posted by Zombie killer

Offset could also be determined by the style of wheel you select. I am currently running a 19x11 upfront with no rubbing at all so it is possible. I am also on 1" lowering springs and running camber plates to gain the negative camber I want. Now the 305s do still poke out some but since I don't use them as my DD it's no big deal for me. Although my local tire installer did cuss when he tried to mount them, I did go with a 30 series tires.

What camber and offsets are you running if I may ask?