[Mr. Wyndham]

Originally Posted by KaBoom1701

Good luck with the tires sizes of thr R888...

only 285 and 315....




I've been running GY's for the past 3 yrs worth of track days. I'm going to try the MPSS next and see how they respond at the track.

Be sure to let us know, you'll probably get to it before I do.

[Thor142]

Originally Posted by Evolvedx27

Nothing wrong with OEM tires but when they go bald in 10-15k miles you might want something that lasts twice to three times as long with same or better performance.

Where do they sell these magic tires?

[Can'tHave2MuchHP]

Originally Posted by URBAN LEGEND

A 315 is a different size by different manufacturers. You must know the Brand. A 325 Bridgestone is really a 315 for Michelin. All real world experience.
.

Yes they vary slightly. However, if they are advertising 315, then it's "close" for everyone. The 315 is one of many standard measurement and no manufacturer can be too far off from the advertised size of a tire.

And specifically for the R888 argument that goes back to Camaro5 with KaBoom complaining about millimeters, the R888 looks IDENTICAL to the OEM F1s that are on the 5th Gens from all angles (Except the tread is different), and more than likely, zero changed between those and these new ones as far as height, width.

This goes back, keep out if you don't know Unlike quite a few people, I'm not just going to post BS info that I just "read" from somewhere or some article written by a guy in a tie at a magazine.

[URBAN LEGEND]

Originally Posted by Can'tHave2MuchHP

Yes they vary slightly. However, if they are advertising 315, then it's "close" for everyone. The 315 is one of many standard measurement and no manufacturer can be too far off from the advertised size of a tire.

And specifically for the R888 argument that goes back to Camaro5 with KaBoom complaining about millimeters, the R888 looks IDENTICAL to the OEM F1s that are on the 5th Gens from all angles (Except the tread is different), and more than likely, zero changed between those and these new ones as far as height, width.

This goes back, keep out if you don't know Unlike quite a few people, I'm not just going to post BS info that I just "read" from somewhere or some article written by a guy in a tie at a magazine.

I know it wasn't towards me. I was just putting it out there. I run 325/30s upfront on my Z/28. But it's the right brand. All good bro.

[Can'tHave2MuchHP]

Originally Posted by URBAN LEGEND

I know it wasn't towards me. I was just putting it out there. I run 325/30s upfront on my Z/28. But it's the right brand. All good bro.

Love how the Z28 runs those monsters up front, hope they keep it for the new Z28 too.

[00 Trans Ram]

Guys, you have to look past the numbers when comparing tires.

315/30-20, TW300

That size means:

315mm section width. This is the measurement of the widest portion of the tire. Not the tread, but at some point in the middle of the sidewall. If you want to know the width of the part that touches the ground, you have to find tread width. Hoosier regularly publishes this, but it can be hard to find on other tires. However, even within the same brand and model of tire, these 2 items (tread and section width) don't always go hand-in-hand. Just because something is 20mm wider in section width, doesn't mean it's always going to be 20mm wider in tread width.

30 - This is a percentage. This means that the sidewall is 30% as tall as the section width. So, a 30-series tire means that EACH sidewall is 94.5mm tall. Or, 3.72".

20 - Obviously, rim size. To find overall tire height, you have to solve 3.72*2+20, which is 27.44".

TW300 - Treadwear is an almost meaningless number. Within the same exact tire model, if you find 2 different treadwear numbers, then you can compare them. For instance, if you find a PSS with a 300 TW and another PSS with a 200 TW, then you can be relatively confident that the 300 will last 50% longer. But, you can't begin to compare a TW300 PSS and a TW300 Nitto. Tire manufacturers are not required to submit their tires to any standardized test for treadwear or tire life. These numbers are simply a standardized number, but only relative for comparison within specific model ranges.

Take a look at any SCCA "Street tire" forum, and you'll see that, ostensibly, tires have to have a UTQG rating of 200 (that's TW rating). But, keep reading the forums, and you'll soon learn that some of those "TW200" tires are little more than racing slicks that have a "200" printed on the side.

[KaBoom1701]

Originally Posted by Mr. Wyndham

Be sure to let us know, you'll probably get to it before I do.

Will do.

I'm thinking of going with 295's up front and 315's in the rear.

Might help keep this heavy car from "pushing" so much in the corners at the track....we'll see.

Originally Posted by Can'tHave2MuchHP

Yes they vary slightly. However, if they are advertising 315, then it's "close" for everyone. The 315 is one of many standard measurement and no manufacturer can be too far off from the advertised size of a tire.

And specifically for the R888 argument that goes back to Camaro5 with KaBoom complaining about millimeters, the R888 looks IDENTICAL to the OEM F1s that are on the 5th Gens from all angles (Except the tread is different), and more than likely, zero changed between those and these new ones as far as height, width.

This goes back, keep out if you don't know Unlike quite a few people, I'm not just going to post BS info that I just "read" from somewhere or some article written by a guy in a tie at a magazine.

Well according to my 8th grade math skills that's a 3.2% bigger tire patch on the ground....and I need all the rubber out back with the mods I'm running now.

To each their own I guess.....

[Can'tHave2MuchHP]

Originally Posted by KaBoom1701

Will do.

I'm thinking of going with 295's up front and 315's in the rear.

Might help keep this heavy car from "pushing" so much in the corners at the track....we'll see.



Well according to my 8th grade math skills that's a 3.2% bigger tire patch on the ground....and I need all the rubber out back with the mods I'm running now.

To each their own I guess.....

Wider is better, it's never going to hurt (To an extent, let's not go crazy here). But "Good luck with a 285 and 315" doesn't seem to imply you want wider, as both are already wider than the OEM sizes.

[Evolvedx27]

Originally Posted by Thor142

Where do they sell these magic tires?

not magic... tire rack is great site for info. along with many other sites...

[Thor142]

Originally Posted by Evolvedx27

not magic... tire rack is great site for info. along with many other sites...

What tire is it that you think is going to last 2-3x longer with the same or better performance than the GY G3?

[17CamaroZL1]

Originally Posted by Thor142

What tire is it that you think is going to last 2-3x longer with the same or better performance than the GY G3?

+1

I want them, whatever they are

[KaBoom1701]

The MPS4S claim 9% but we'll see how this holds up at the track.

http://www.michelinman.com/US/en/tir...-sport-4s.html

[Evolvedx27]

In my opinion, my experience, and from research. the Michelins. Track is out of the question. Street only. 10 x3=30. 15x2=30. Even if it's not the same performance better treadlife may be worth a small performance loss. Again street only. All depends on what you're doing with the car.

[Mr. Wyndham]

Originally Posted by KaBoom1701

Will do.

I'm thinking of going with 295's up front and 315's in the rear.

Might help keep this heavy car from "pushing" so much in the corners at the track....we'll see.

I didn't know it had a pushing problem...in fact, I've read it's really well behaved? Certainly felt really good during the ride.

In any event - if you want to combat understeer...going wider on the rear isn't going to help. This is the reason the Z/28 stuck with 305s on all four corners.

It's also the reason they increased the front track width a bit, yet decreased the rear on the ZL1 vs the SS...to improve front-end bite.