+23 or +35 offset?

[Nighthawk89]

Originally Posted by Racer X

The difference between +23 and +35 is roughly a half inch. If you look at Factory Reproductions Facebook page pictures that half inch is more apparent than you might think (visually). I know a few people that have had issues with big front tires rubbing on the inside rather than the outside and having to run spacers to get them away from the struts. Much of it is just personal preference. I'll stick with factory offsets even after I upgrade the fronts from 275/40R20 Continentals to 285/35R20 PSSs. Good luck with your decision.

I'm going factory offsets. I thought about it and decided that I prbly won't lower the car for a long time and the factory offset seems to be having no issues. +23 for me.

[EVIL 2SS]

Originally Posted by Racer X

Absolutely no issues going over bumps or in and out of the driveway. Not a lot of clearance, but enough. I've got almost 3k on the the set and they have seen about everything with no rubbing. Factory Reproductions almost talked me into the +35 because of potential rubbing issues but I'm glad they didn't. There are several other members dropped and running stock ZL1 offsets with my tire sizes (275/40R20 front and 315/35R35 rear) and having no problems.

As for as Continental Extreme Contact tires are concerned, I will have to give them a mixed review. Prior to these I had a square set-up with 20X9s with 275/40R20s P-Zeros on all corners. Steering was much more crisp with this set-up but I didn't like how the tires turned to hard plastic when it got below 40 degrees. The Continentals solved the cold problem but I don't like the handling as much. Guess that is why folks have summer and winter sets. All-in-all, the Continentals are a good all around tire.

Is there a separate thread where these other members have discussed running stock ZL1 offsets with no issues after lowering ?

Im considering the Factory Reproduction ZL1 wheels 20X10 and 20X11 from Phastek with the stock offsets and same tire size that you're running. No plans to lower it yet, but don't want to run into issues in the future.

[Nighthawk89]

Originally Posted by EVIL 2SS

Is there a separate thread where these other members have discussed running stock ZL1 offsets with no issues after lowering ?

Im considering the Factory Reproduction ZL1 wheels 20X10 and 20X11 from Phastek with the stock offsets and same tire size that you're running. No plans to lower it yet, but don't want to run into issues in the future.

After installing my wheels a few months back i lowered the vehicle. 1 inch in the rear and 1.4 up front. No issues rubbing. Hope this helps.

[EVIL 2SS]

Originally Posted by Nighthawk89

After installing my wheels a few months back i lowered the vehicle. 1 inch in the rear and 1.4 up front. No issues rubbing. Hope this helps.

And that was with a 20x10 wheel with a +23 offset in the front?

Thanks for the input.

[SS PANTHER]

I run 285-35-20's on 20x10 +23's all around and love it. I am lowered 1" on Hotchkis springs and have Autocrossed with this combination without any scrapping or rubbing. I wanted the capability of rotation front to rear. The 285-35-20's lower the car an additional 3/8" or ~.40 inch. This put my rear measurements at 660mm and the front at 655mm measured from the bottom lip of the rim to the top of the fender arch. These are the recommended meausurements for a lowered car without negatively affecting axle and suspension geometry.
When I ran Autocross with 275-40-20's all around with these wheels lowered 1", I cut the front tires on the outer edge with the upper edge of the fender well. I would not run a 40 series tire if you want a good handling Camaro.

[Nighthawk89]

Originally Posted by SS PANTHER

I run 285-35-20's on 20x10 +23's all around and love it. I am lowered 1" on Hotchkis springs and have Autocrossed with this combination without any scrapping or rubbing. I wanted the capability of rotation front to rear. The 285-35-20's lower the car an additional 3/8" or ~.40 inch. This put my rear measurements at 660mm and the front at 655mm measured from the bottom lip of the rim to the top of the fender arch. These are the recommended meausurements for a lowered car without negatively affecting axle and suspension geometry.
When I ran Autocross with 275-40-20's all around with these wheels lowered 1", I cut the front tires on the outer edge with the upper edge of the fender well. I would not run a 40 series tire if you want a good handling Camaro.

What tires are those?

[SS PANTHER]

Originally Posted by Nighthawk89

What tires are those?

Michelin Pilot Super Sports. Too bad your car is down and you can't make it tomorrow to the Corvette SCS.

[Nighthawk89]

Originally Posted by SS PANTHER

Michelin Pilot Super Sports. Too bad your car is down and you can't make it tomorrow to the Corvette SCS.

Yeah. Im bummed but there will be more. To top the fact that it is down my freshly painted rear bumper got a nice scratch on it. Has to be re-painted so i went ahead and took everything back off and taken apart ready for paint..

[SS PANTHER]

Originally Posted by Nighthawk89

Yeah. Im bummed but there will be more. To top the fact that it is down my freshly painted rear bumper got a nice scratch on it. Has to be re-painted so i went ahead and took everything back off and taken apart ready for paint..

Good luck with your repaint and build. Look forward to seeing you at an upcoming SCS event.

[VR Baron]

If you run coilovers you can do alot with wheel sizes. With pedders (or bc racing) you gain 10mm more space wheel to strut area. I run TWS bathurst 10 spoke concave wheels 20x10.5 with 25 offset and MPSS 285 tires with no rubbing, and that with the alignment maxed out at 1.9 degrees negative camber.

[JT Camaro]

Originally Posted by SS PANTHER

I run 285-35-20's on 20x10 +23's all around and love it. I am lowered 1" on Hotchkis springs and have Autocrossed with this combination without any scrapping or rubbing. I wanted the capability of rotation front to rear. The 285-35-20's lower the car an additional 3/8" or ~.40 inch. This put my rear measurements at 660mm and the front at 655mm measured from the bottom lip of the rim to the top of the fender arch. These are the recommended meausurements for a lowered car without negatively affecting axle and suspension geometry.
When I ran Autocross with 275-40-20's all around with these wheels lowered 1", I cut the front tires on the outer edge with the upper edge of the fender well. I would not run a 40 series tire if you want a good handling Camaro.

so with a 20x10 +23 and a 275/40/20 and a 1" drop you rubbed?
Just want to be clear as i am just about to put the same thing on the car with a 1.4" drop

[SS PANTHER]

Originally Posted by JT Camaro

so with a 20x10 +23 and a 275/40/20 and a 1" drop you rubbed?
Just want to be clear as i am just about to put the same thing on the car with a 1.4" drop

Yes. During Autox where I was pushing them to the limit.

[JT Camaro]

Originally Posted by SS PANTHER

Yes. During Autox where I was pushing them to the limit.

drat! not sure what to do now

[SS PANTHER]

Originally Posted by JT Camaro

drat! not sure what to do now

Did you buy new tires already? You could look at rolling the upper fender lip as mine were sharp and actually cut the tires at the top of the sidewall. You would still likely rub under hard cornering or a large dip. Go to a +35 obviously, go with a 35 series tire, or some heavy camber. Maybe some others have an idea with an inexpensive solution. Justice Pete, the vendor on this forum sells a front knuckle drop kit that may work. You could email him or JDP Motorsports to find some solutions. Good luck.