Wheel size effect on straight line performance?

JasonGofast · 11-13-2020, 02:11 PM

Looking to get 19 inch instead of 20 inch wheels for wider tires. Will this have any effect on straight line performance? I know the car will need to be tuned to show the correct speed.

Z OH 6 · 11-13-2020, 02:15 PM

Depends on the overall diameter of the wheel/tire combination, if the diameter is larger, then it will effectively raise the rear end ratio, if the diameter is smaller, it will effectively lower the rear end ratio.

Markoz28 · 11-13-2020, 02:29 PM

If I went with 19s it would be a 19x12 and I would put on a 345/30/19 R888R. If I stayed with 20s it would be my current 20x11.5” with 325/30/20 R888R.

JasonGofast · 11-13-2020, 03:01 PM

Quote:

Originally Posted by Markoz28

If I went with 19s it would be a 19x12 and I would put on a 345/30/19 R888R. If I stayed with 20s it would be my current 20x11.5” with 325/30/20 R888R.

Yes I'm considering something like that. I just want to know if it'll make the car slower in any way. Talking tenths in the 60-130.

Markoz28 · 11-13-2020, 03:12 PM

If your car is stock it may slow it down in the 60-130 but not by much.

Z OH 6 · 11-13-2020, 03:40 PM

In the 60-130, if the car needs traction it could help with a wider tire but if the car isn't currently spinning at 60mph, then a wider tire is going to make you slightly slower due to more tire friction.

FoundNemo · 11-13-2020, 06:10 PM

I swapped to APEX ARC-8 19x10, 19x11's with 285/30R19 PS4S tires and 305/30R19 R888R's in the rear. Nice torque increase from the effective gearing change, fantastic grip, notably quicker and peppier all around. 32lbs or so lost rotating and lower distance from centerline, so much less rotational inertia. Calculates similarly to the GT350R vs GT350 differences overall, about 0.2-0.3 gain assuming traction.

Bangkok_ZL1 · 11-14-2020, 10:48 AM

Quote:

Originally Posted by FoundNemo

I swapped to APEX ARC-8 19x10, 19x11's with 285/30R19 PS4S tires and 305/30R19 R888R's in the rear. Nice torque increase from the effective gearing change, fantastic grip, notably quicker and peppier all around. 32lbs or so lost rotating and lower distance from centerline, so much less rotational inertia. Calculates similarly to the GT350R vs GT350 differences overall, about 0.2-0.3 gain assuming traction.

Assuming Traction..... and that's usually the crux

FoundNemo · 11-16-2020, 06:54 AM

Quote:

Originally Posted by Bangkok_ZL1

Assuming Traction..... and that's usually the crux

And thats why I have R888R's

11-13-2020, 02:11 PM	#1
JasonGofast Used to own a ZL1 Drives: '16 Z06 Join Date: Apr 2020 Location: TX Posts: 279	Wheel size effect on straight line performance? Looking to get 19 inch instead of 20 inch wheels for wider tires. Will this have any effect on straight line performance? I know the car will need to be tuned to show the correct speed.

11-13-2020, 02:15 PM	#2
Z OH 6 Drives: 2024 CT5-V Blackwing Join Date: Sep 2020 Location: GA Posts: 3,557	Depends on the overall diameter of the wheel/tire combination, if the diameter is larger, then it will effectively raise the rear end ratio, if the diameter is smaller, it will effectively lower the rear end ratio.

11-13-2020, 02:29 PM	#3
Markoz28 Drives: 18 ZL1 nightfall grey A10 Join Date: Apr 2018 Location: RGV Texas Posts: 1,527	If I went with 19s it would be a 19x12 and I would put on a 345/30/19 R888R. If I stayed with 20s it would be my current 20x11.5” with 325/30/20 R888R.

11-13-2020, 03:12 PM	#5
Markoz28 Drives: 18 ZL1 nightfall grey A10 Join Date: Apr 2018 Location: RGV Texas Posts: 1,527	If your car is stock it may slow it down in the 60-130 but not by much.

11-13-2020, 03:40 PM	#6
Z OH 6 Drives: 2024 CT5-V Blackwing Join Date: Sep 2020 Location: GA Posts: 3,557	In the 60-130, if the car needs traction it could help with a wider tire but if the car isn't currently spinning at 60mph, then a wider tire is going to make you slightly slower due to more tire friction.

11-13-2020, 06:10 PM	#7
FoundNemo Drives: 2019 ZL1 Join Date: Oct 2019 Location: GA Posts: 573	I swapped to APEX ARC-8 19x10, 19x11's with 285/30R19 PS4S tires and 305/30R19 R888R's in the rear. Nice torque increase from the effective gearing change, fantastic grip, notably quicker and peppier all around. 32lbs or so lost rotating and lower distance from centerline, so much less rotational inertia. Calculates similarly to the GT350R vs GT350 differences overall, about 0.2-0.3 gain assuming traction.

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