Supercar 3 wider than Supercar 3R?

CDFF · 03-22-2020, 08:08 PM

So I just received some Supercar 3‘s in ZLE sizes and stacked them up next to a set of ZLE wheels I have with 3R’s on them. Both stacks are 2x325/30/19 and 2x305/30/19.

Are the supercar 3’s wider then the 3R? Once I mount them and use them will they narrow to match?

I guess I will find out once I get them mounted up and put some miles on them.

Stephen12ZL1 · 03-22-2020, 10:02 PM

wow!

Matos1LE · 03-23-2020, 09:33 AM

Quote:

Originally Posted by CDFF

So I just received some Supercar 3‘s in ZLE sizes and stacked them up next to a set of ZLE wheels I have with 3R’s on them. Both stacks are 2x325/30/19 and 2x305/30/19.

Are the supercar 3’s wider then the 3R? Once I mount them and use them will they narrow to match?

I guess I will find out once I get them mounted up and put some miles on them.

I think you would need to mount them in order to have a proper comparison.

Jaxcam02 · 03-23-2020, 10:48 AM

eh just throw them on. Just more rubber to keep you planted now.

TheRealJA105 · 03-23-2020, 11:54 AM

I would say throw a tape measure across both sizes of the 3s on the inside to get a bead to bead measurement. If the 305s are more than 11" and the 325s are more than 12", then you know the wheels will be pulling in on them and make them more narrow. That seems like a large difference though.

Vtor_ZL1 · 03-23-2020, 11:58 AM

Both mounted on same size wheels ?

RUQWIKR · 03-23-2020, 12:28 PM

I have a new set of both G3 and G3R's unmounted I just measured individually and all together. The G3's unmounted are 9.5mm total wider Section Width than the G3R's unmounted (305 & 325/30/19). Anyways...the G3’s are a fat set of tires, and the G3R's are not exactly skinny ones for their given sizes. That's the top of the stacks of four new tires each.

zx9rmal · 03-23-2020, 12:38 PM

According to Tire Rack, the rears are exactly the same for both the 3 and 3R. 13.0 section width, 12.3 tread width, and 26.3 diameter.

The fronts are slightly different. For the 3's, 12.3 section width, 11.6 tread width, and 26.3 diameter. The 3R is the same other than tread width which is 11.3.

RUQWIKR · 03-23-2020, 12:42 PM

Quote:

Originally Posted by zx9rmal

According to Tire Rack, the rears are exactly the same for both the 3 and 3R. 13.0 section width, 12.3 tread width, and 26.3 diameter.

The fronts are slightly different. For the 3's, 12.3 section width, 11.6 tread width, and 26.3 diameter. The 3R is the same other than tread width which is 11.3.

Specs vs. reality are different. About 2mm wider per tire total Section Width unmounted.

zx9rmal · 03-23-2020, 12:46 PM

Quote:

Originally Posted by RUQWIKR

Specs vs. reality are different. About 2mm wider per tire total Section Width unmounted.

Tire Rack is a pretty good source. Just passing along useful info.

It would seem that unmounted would be meaningless. Everything about tires and suspension should be based on operating conditions, no?

RUQWIKR · 03-23-2020, 01:04 PM

Quote:

Originally Posted by zx9rmal

Tire Rack is a pretty good source. Just passing along useful info.

It would seem that unmounted would be meaningless. Everything about tires and suspension should be based on operating conditions, no?

TireRack is an excellent source, but, the tires are not going to get narrower mounted. Of course, there is a different tread design, tread compound, and shoulder design between the two.

I just wanted to compare unmounted to unmounted where the original poster had mounted G3R's vs. unmounted G3's.

zx9rmal · 03-23-2020, 01:22 PM

Quote:

Originally Posted by RUQWIKR

TireRack is an excellent source, but, the tires are not going to get narrower mounted. Of course, there is a different tread design, tread compound, and shoulder design between the two.

I just wanted to compare unmounted to unmounted where the original poster had mounted G3R's vs. unmounted G3's.

True. But who knows how the tires were stacked in the warehouse, compressed, etc.
Interesting that the front tread widths are different, unless a typo on their site.

3.8TransAM · 03-23-2020, 01:30 PM

Welcome to the world of tires. Diameters and widths do not match between manufacturers and your lucky if they do within the same line.

Mountain · 03-23-2020, 09:38 PM

Unmounted vs mounted, yeah a tire will likely get narrow in terms of section width, but tread width will be tread width. It's not like material all of a sudden disappears.

I mean, you also need to consider an unloaded vs loaded mounted tire too.

If the 305 SC3 is wider than the SC3R, you may not get that extra tread to the main contact patch, but it will be there rolled more onto the sidewall, which can mean something depending on your alignment settings and suspension. So instead of rolling onto the sidewall or end of the tread, you roll onto more tread or are less at the end of the tread.

03-22-2020, 08:08 PM	#1
CDFF Drives: 2018 ZL1 1LE Join Date: Jan 2020 Location: San Diego Posts: 26	Supercar 3 wider than Supercar 3R? So I just received some Supercar 3‘s in ZLE sizes and stacked them up next to a set of ZLE wheels I have with 3R’s on them. Both stacks are 2x325/30/19 and 2x305/30/19. Are the supercar 3’s wider then the 3R? Once I mount them and use them will they narrow to match? I guess I will find out once I get them mounted up and put some miles on them. Attached Images

03-22-2020, 10:02 PM	#2
Stephen12ZL1 Drives: '21 ZLE A10 Join Date: May 2012 Location: Mechanicsville, VA Posts: 6,808	wow! __________________ '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)

03-23-2020, 10:48 AM	#4
Jaxcam02 Drives: 2017 Silverado/2017 ZL1 Join Date: Aug 2019 Location: Jax/Palatka FL Posts: 1,090	eh just throw them on. Just more rubber to keep you planted now. __________________

03-23-2020, 11:58 AM	#6
Vtor_ZL1 Who Needs to KNOW? Drives: 18 ZLE Join Date: May 2018 Location: Left Side of the Moon Posts: 1,770	Both mounted on same size wheels ? __________________ ing for grip. Are you in the NY/NJ/PA/CT region? Join us for autox fun at MetLife Stadium. HUGE lots, tons of runs. http://www.motorsportsne.com/

03-23-2020, 12:28 PM	#7
RUQWIKR Drives: 1LEs Join Date: May 2009 Location: DFW - Texas Posts: 1,319	I have a new set of both G3 and G3R's unmounted I just measured individually and all together. The G3's unmounted are 9.5mm total wider Section Width than the G3R's unmounted (305 & 325/30/19). Anyways...the G3’s are a fat set of tires, and the G3R's are not exactly skinny ones for their given sizes. That's the top of the stacks of four new tires each. Attached Images

03-23-2020, 11:54 AM	#5
TheRealJA105 Drives: 2013 C6Z06 Join Date: Nov 2016 Location: PA Posts: 1,577	I would say throw a tape measure across both sizes of the 3s on the inside to get a bead to bead measurement. If the 305s are more than 11" and the 325s are more than 12", then you know the wheels will be pulling in on them and make them more narrow. That seems like a large difference though.

03-23-2020, 12:38 PM	#8
zx9rmal Drives: '20 ZL1 M6 Join Date: Apr 2017 Location: FT. Lauderdale, FL Posts: 717	According to Tire Rack, the rears are exactly the same for both the 3 and 3R. 13.0 section width, 12.3 tread width, and 26.3 diameter. The fronts are slightly different. For the 3's, 12.3 section width, 11.6 tread width, and 26.3 diameter. The 3R is the same other than tread width which is 11.3. __________________ Mal Ft. Lauderdale, FL '20 Camaro ZL1 M6 '22 Kawasaki ZX-14R

03-23-2020, 01:30 PM	#13
3.8TransAM Drives: SS 1LE, 89 TTA, 91 GTA, 91 Formula Join Date: Jul 2019 Location: NW IN Posts: 600	Welcome to the world of tires. Diameters and widths do not match between manufacturers and your lucky if they do within the same line.

03-23-2020, 09:38 PM	#14
Mountain Drives: 2017 SS 1LE, 2016 1SS (previous) Join Date: Apr 2016 Location: Metro-Detroit Posts: 1,863	Unmounted vs mounted, yeah a tire will likely get narrow in terms of section width, but tread width will be tread width. It's not like material all of a sudden disappears. I mean, you also need to consider an unloaded vs loaded mounted tire too. If the 305 SC3 is wider than the SC3R, you may not get that extra tread to the main contact patch, but it will be there rolled more onto the sidewall, which can mean something depending on your alignment settings and suspension. So instead of rolling onto the sidewall or end of the tread, you roll onto more tread or are less at the end of the tread.

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