[Torquem]

I'm curious if someone has a cut or pictures showing why this is the case. I'd like to see what changes going from a 19x12 to a 20x12 inch wheel that prevents it from being run. Thanks for any help!

[JeromeS13]

What's the source of this information?

[LibertyHill]

Originally Posted by jwdominick

I run a 19x11 and a 18x20 forgestar f14

BADASS!!

[Torquem]

Originally Posted by JeromeS13

What's the source of this information?

Custom wheel manufacturers.

[JeromeS13]

Originally Posted by Torquem

Custom wheel manufacturers.

Given the same offset, that doesn't make any sense. The only limitation at that point would be the tire size...

[Torquem]

Exactly. So that's why I'm asking the question

[FlowForm_Wheels]

Not that I'm aware of any similar issues, but for example a Cayman GT4 if you run a 19" wheel the maximum rear wheel size is 10.5" due to the toe link on the rear, but if you were to run a 20" wheel, that barrel size gives enough clearance to the toe link to use a 20x11" wide wheel.

I'm not aware of any issue like this on the Camaro though... Anyone who says a 12" wide wheel actually 'fits' on this car is bending the truth though. Widest recommendation we give is a 11" wide wheel on this car. Any size larger than 11" without modifications done to the car to accommodate, will cause the wheels to poke outside the fenders.

[Torquem]

Originally Posted by FlowForm_Wheels

Not that I'm aware of any similar issues, but for example a Cayman GT4 if you run a 19" wheel the maximum rear wheel size is 10.5" due to the toe link on the rear, but if you were to run a 20" wheel, that barrel size gives enough clearance to the toe link to use a 20x11" wide wheel.

I'm not aware of any issue like this on the Camaro though... Anyone who says a 12" wide wheel actually 'fits' on this car is bending the truth though. Widest recommendation we give is a 11" wide wheel on this car. Any size larger than 11" without modifications done to the car to accommodate, will cause the wheels to poke outside the fenders.

The Zl1 1LE runs 19x12 and it the same fenders, no?

[FlowForm_Wheels]

Originally Posted by Torquem

The Zl1 1LE runs 19x12 and it the same fenders, no?

We haven't yet seen a local ZL1 1LE to laser 3D Scan yet (yes we 3D scan every car so that we can determine our fitment instead of taking measurements by the old school way), so I can't compare and contrast with the info I have, but I'm sure a combination of things allows GM to run a wider wheel. Even an offset coilover system that gives more clearance for the wheel could give us an extra inch of room, it just depends on all the variables, not just the fenders.

If anyone local to San Diego, CA wants to allow us to scan their car, we'd get to the bottom of it and verify the differences.

[Torquem]

The z28 wheels are 19x12 as well, aren't they?

[seddon]

You need to have the right offset and back spacing. You need the right wheel company maybe hre, adv1, or edc

[PK Auto Design]

19x12 and 20x12 can be done

I have done multiple setups using a 19x11 to 12" rear

This can be done on a 20" also.

[DGthe3]

Originally Posted by Torquem

I'm curious if someone has a cut or pictures showing why this is the case. I'd like to see what changes going from a 19x12 to a 20x12 inch wheel that prevents it from being run. Thanks for any help!

I can't think of anything that would cause that. The extra half inch radius only makes for a bit more air space in the middle of the wheel & tire. Thats not a problem for anything. Sure, the barrel is sitting out a little farther from the rim but anything that it would be hitting would get the tire on a 19" rim.

Did the place that told you this happen to be out of 20 x 12 wheels and/or extra sets of 19x12's?

[RideZX6R]

Originally Posted by FlowForm_Wheels

We haven't yet seen a local ZL1 1LE to laser 3D Scan yet (yes we 3D scan every car so that we can determine our fitment instead of taking measurements by the old school way), so I can't compare and contrast with the info I have, but I'm sure a combination of things allows GM to run a wider wheel. Even an offset coilover system that gives more clearance for the wheel could give us an extra inch of room, it just depends on all the variables, not just the fenders.

If anyone local to San Diego, CA wants to allow us to scan their car, we'd get to the bottom of it and verify the differences.

the main reason is DSSV shocks (like on the ZL1 1LE) are much narrower than the wider Mag ride shocks.