Checkered Past

Looking for information on what you guys are running for wheel offset on custom forged wheels.

I would like the wheel close to flush with the fender lip. I have been recommended the following by the wheel manufacturer. I just want to additional feedback/recommendations that maybe I have not thought about, or is this the perfect setup.

+30 on front 10 x19. +35 on 10.5 x 19
+50 on rear. 12 x 19

PMPerformance

They will be pushed out a bit from stock, but they won’t be flush.
You technically don’t want them flush unless you like to live on the wild side, but 15-10mm is not going to get you flush. Most people put 20mm spacers on to flush their wheels. I’d say +15-18mm additional over stock offsets would probably be a nice sweet spot

Checkered Past

Thanks for the reply. I just want them out further than stock because I think stock they sit to far inside the wheel well. I do not want them sticking out that is for sure. That’s why I am asking what y’all are running.

please others chime in.

Checkered Past

Bump

JABCAT

+32F (19x10) & +50 rear (20x12). Do you have a base or wide-body car?

PMPerformance

that’s wild you got that flush with basically 8/10mm difference.

JABCAT

How they should have come from the factory.

PMPerformance

agreed . Those are aftermarket speedline reps I assume?

Checkered Past

Wide body. Thanks Jabcat! That is exactly what I wanted to confirm. I am still trying to decide on 19x19 or 19x20 setup I think either will look great. Nice Ride BTW.

C6_Prodigy

Depends... some C6 rear ends are not aligned perfectly centered. Mine is one of them.

20mm spacers put my right, rear wheel too far out but my left rear was perfect.

If I were ordering custom wheels, for the rear I would order 13mm further out than stock and then you have room to dial it in with smaller spacers, up to 7mm, on the stock studs. Stock being 12" wide, +59 offset and my suggestion being 12" wide, +46. This also jives with JABCAT's post because you can see there is room to go out a few more mm on the rear.

10" wide and +30mm offset is perfect on the front of my car, +32 looks really good on JABCAT's and gives you room for a tire with a meatier sidewall like he has. I run Hankooks and they have a less blocky, more round sidewall.

I have 19" wheels all around and if doing it again, would do 20" in the rear.

JABCAT

Wheel Designers GS01 forged

Checkered Past

Thanks for the suggestion Prodigy. If I may ask why would you move to the 20” rear wheel? This is something I’m trying to determine myself but seems the 19/19 is very popular with the C6 crowd. Your opinion on this might be helpful.

thanks for the replies fellas!

C6_Prodigy

I just like the look of a bigger rear wheel. Tires are considerably more expensive though.

Checkered Past

Gotcha. Thanks for the reply!

jbc1995fb

I don't think the 19"/19" is that "very" popular.

I would guess the majority of people still stager their wheels. Even if you get 19"/19" you're not going to be able to rotate the wheels front to back, so why bother getting this set up?
In my opinion, if you want a 19" wheel up front, go w/ a 20" on the rear. Yes this would require 4 new tires, but it is worth it.

LOURDESBELLE

As mentioned, 19/20 is a combination. Look at the ZR1, a very well proven machine in every way! It runs 19/20 combo wheels and tires and well thought of by GM engineers and no rocket science here

VetteVinnie

What's nice about the factory ZR1 wheels and tire sizes is they match the height of the factory Grand Sport sizes perfectly so there's no impact to speedometer or wheel speed sensors. But I would never try to put these on a base body style without a wide-body conversion. They would stick out too far.