Any A10 ZL1's swapped to 19's with a 305/30R19 Rear having issues due to tire height?

FoundNemo · 11-23-2019, 06:31 AM

Just curious if anyone has noticed issues with timing or speedo/etc with the reduction in tire height in the rear on an A10 ZL1 or otherwise? Stock ride height is 27.2" but I've gone to APEX 19's and currently on 275/35R19 front and 295/35R19 rears (within 0.1" of oem height).

Considering swapping to Sport Cup 2's in 275/35R19 fronts and 305/30R19 rear, which APEX lists as compatible sizes, but wanted to be sure the 0.9" reduction in rear tire height wont cause any issues with the ECM/stabilitrak/A10 etc.

Stephen12ZL1 · 11-23-2019, 07:05 AM

no issues with 325/30-19 rear and 305/30-19 front here...the traction control light blinks for the first few seconds then it goes away. Make sure you run tire pressure sensors and synch them to the car after swapping.

17CamaroZL1 · 11-23-2019, 03:35 PM

Traction control will activate much sooner, but it will drive just fine. If you turn TC off or use Competitive mode, there will be zero change other than the speedo reading higher than your actual speed.

CharlieRomeo · 11-23-2019, 07:14 PM

Quote:

Originally Posted by 17CamaroZL1

Traction control will activate much sooner, but it will drive just fine. If you turn TC off or use Competitive mode, there will be zero change other than the speedo reading higher than your actual speed.

Is there a way to fix the speedo being off or are we just stuck with it when we change the factory rim size? I didn't know if there is a way of adjusting it or not.

17CamaroZL1 · 11-23-2019, 10:31 PM

Quote:

Originally Posted by CharlieRomeo

Is there a way to fix the speedo being off or are we just stuck with it when we change the factory rim size? I didn't know if there is a way of adjusting it or not.

Rim size doesn't matter, but I'm sure you meant tire diameter. The only way to fix it that I know of is to tune it. I only run a shorter tire when I run my drag radials at the strip, so it's not that big of a deal for me. Once I decide to start tuning the car, I may look to see if it's a simple change I could make just so my PDR data will be right.

Markoz28 · 11-23-2019, 11:27 PM

What you are considering is a shorter tire in the rear than the front. This will throw the balanace of the car off and in my opinion look strange.

I think this is a bad idea. If going with 19” rim you should at least use a 325/30/19 so that you are close to the factory height. Also 275/35/19 will be a bit more narrow than factory fronts.

11-23-2019, 06:31 AM	#1
FoundNemo Drives: 2019 ZL1 Join Date: Oct 2019 Location: GA Posts: 573	Any A10 ZL1's swapped to 19's with a 305/30R19 Rear having issues due to tire height? Just curious if anyone has noticed issues with timing or speedo/etc with the reduction in tire height in the rear on an A10 ZL1 or otherwise? Stock ride height is 27.2" but I've gone to APEX 19's and currently on 275/35R19 front and 295/35R19 rears (within 0.1" of oem height). Considering swapping to Sport Cup 2's in 275/35R19 fronts and 305/30R19 rear, which APEX lists as compatible sizes, but wanted to be sure the 0.9" reduction in rear tire height wont cause any issues with the ECM/stabilitrak/A10 etc.

11-23-2019, 07:05 AM	#2
Stephen12ZL1 Drives: '21 ZLE A10 Join Date: May 2012 Location: Mechanicsville, VA Posts: 6,809	no issues with 325/30-19 rear and 305/30-19 front here...the traction control light blinks for the first few seconds then it goes away. Make sure you run tire pressure sensors and synch them to the car after swapping. __________________ '21 ZLE A10 Wild Cherry PDR 2:00.78 VIR Full 10.68@131.69 1.68 60' '17 ZL1 A10 Mosaic Black PDR/Nav 2:03.08 VIR Full 11.003@129.2 1.75 (sold) '15 Z/28 #325 Black a/c & stereo. 2:10.1 VIR Full (sold) '12 ZL1 A6 Black 10.52@131 1.55 60' 2:13 VIR Full (sold)

11-23-2019, 03:35 PM	#3
17CamaroZL1 Life's Short, Live Fast! Drives: 2017 Hyper Blue A10 ZL1 Join Date: Nov 2016 Location: London, KY Posts: 2,015	Traction control will activate much sooner, but it will drive just fine. If you turn TC off or use Competitive mode, there will be zero change other than the speedo reading higher than your actual speed. __________________ Life's Short, Live Fast! https://youtu.be/rTUv2p4T7OA 10.94 at 128 mph, 11.13 at 127mph 870 DA, https://youtu.be/e_X_LcpFp50 11.19 at 127mph 1100 DA, https://youtu.be/OXQiCQdQuH4 11.40 at 125mph 1800 DA https://youtu.be/uWba1qs8M6Q 11.52 at 123mph 3500 DA TZQPHG '17 ZL1 HBM\|A10\|Nav\|PDR\|CFW Hood\|ZL1 Mats 12/26/2016 Ordered! 2/8/2017 Built!! 3/2/2017 Brought Home!!!

11-23-2019, 11:27 PM	#6
Markoz28 Drives: 18 ZL1 nightfall grey A10 Join Date: Apr 2018 Location: RGV Texas Posts: 1,527	What you are considering is a shorter tire in the rear than the front. This will throw the balanace of the car off and in my opinion look strange. I think this is a bad idea. If going with 19” rim you should at least use a 325/30/19 so that you are close to the factory height. Also 275/35/19 will be a bit more narrow than factory fronts.

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