[BoilerUP]

https://philstireservice.com/product...-cr-s-v2-2023/

https://www.tirerack.com/tires/nankang-sportnex-cr-s

[Scargoes]

Originally Posted by BoilerUP

https://www.tirerack.com/tires/nankang-sportnex-cr-s

Sweet, Tire rack has the CR-S now. Can't wait to see their review of them.
But damn are they on the expensive side. My local shop has a set of the V2 315/30R18s for $1600 with installation. My last set of V1s cost $1450 with installation. I personally haven't tried the V2 yet, but guys I know that have said they grip even better than V1s.

[NG329]

Originally Posted by bptuner

Curious to know the difference in times you guys have seen running 18 wheel and tire combo compared to 19's. The factory 19/w supercar tires have been fast just wondering if the cost is worth the switch to 18's.

I am on the fence and debating ordering a set of 18's. I know slicks will be faster around track, but what other DOT legal tire options are there in 18? I don't trailer the car, not that I think the officers in this area will bother, but just for the sake of the debate.

I run the same times with the Hoosier R7 on 18" rims as I do on the SC3R on 19" rims. I think it obviously comes down to driver. Personally, the SC3R feel fantastic when new but the R7 last a heck of a lot longer. Some have reported that R7s last approx. 20-28 sessions at Advanced pace. SC3Rs only last me 12-15 sessions tops. You can get the hoosiers in 19" but they are considerably more expensive. Also, running 18" allow you to buy Pirelli and Michelin scrubs etc which can run anywhere from $700-$900/set. The 18" Apex SM-10 wheels are about 3-4lbs lighter per wheel than the OEM forged. Subtract another 2lbs per wheel for the Apex Forged wheels.

Hoosier A7 and R7 are DOT legal. Not recommended as a road tire but they are legal. You will ABSOLUTELY hydroplane in light rain. Trust me.

[cdrptrks]

I believe Hoosiers get slower as the heat cycles increase. Not sure if this is an issue (or as much of an issue) on the 3Rs.

[Shawnqa800720]

What are the best sites for finding scrubs for 18" wheels? I recently switched and that was one of the potential benefits, but it does seem that there are limits on the sizes for our car - very few make anything above a 295 width. I am running 315R and 295F.

[Christian1LE]

Originally Posted by Shawnqa800720

What are the best sites for finding scrubs for 18" wheels? I recently switched and that was one of the potential benefits, but it does seem that there are limits on the sizes for our car - very few make anything above a 295 width. I am running 315R and 295F.

You can usually find 325/660 or 325/680 pirellis on usedracingtires.com. They will work as they are the same width as a 315 Hoosier R7. You still have to grind your struts and use camber plates to clear the wheel/tires. 305's on those same pirellis will work as well. They both fit on 18x11" wheels.

[Baddawg53]

Originally Posted by DaveC113

Hopefully the V2 Nankangs will be available in ZLE sizes.

For now, despite them being a little smaller, the 295/35/18 RE71RS is going to be the fastest of the 200tw TT/AX tires. 315 A052 will be close, but it doesn't handle heat as well, wears faster, is more expensive and mostly unavailable.

What pressures are you targeting with your RE71RS tires? I was not a huge fan of them at mid/low 30's, sidewall seemed too soft for me, too squishy.

[DaveC113]

Originally Posted by Baddawg53

What pressures are you targeting with your RE71RS tires? I was not a huge fan of them at mid/low 30's, sidewall seemed too soft for me, too squishy.

I'm on Falken RT660s. I have ZLE size wheels, the widest 19" RE is currently a 285. You could probably get it on a 12" wide wheel but I'm not trying it!

The new Nankang CRS are out in ZLE sizes, so that's now an option. I hope they are equal to the RE71RS and A052.

[Baddawg53]

Originally Posted by DaveC113

I'm on Falken RT660s. I have ZLE size wheels, the widest 19" RE is currently a 285. You could probably get it on a 12" wide wheel but I'm not trying it!

The new Nankang CRS are out in ZLE sizes, so that's now an option. I hope they are equal to the RE71RS and A052.

Ahh, I see. I thought you were running the RE71RS. I run nankang AR1 315/30/18 square, but I have a set of 295/35/18 RE71RS as a spare/wet set. I like the AR1 considerably more in the dry but was hoping to find the magic in the Bridgestones that I keep hearing about.

[Scargoes]

Originally Posted by Baddawg53

Ahh, I see. I thought you were running the RE71RS. I run nankang AR1 315/30/18 square, but I have a set of 295/35/18 RE71RS as a spare/wet set. I like the AR1 considerably more in the dry but was hoping to find the magic in the Bridgestones that I keep hearing about.

If you like the AR1, you'll like the CR-S. The V1 was as quick as the AR1, and I hear that the V2 is quicker than the AR1. I'm getting some V2s installed tomorrow. I haven't tried the RE71RS because I don't want a taller and/or narrower tire than what I've been running and I haven't personally seen any evidence that it is a quicker tire.

[DaveC113]

Originally Posted by Scargoes

If you like the AR1, you'll like the CR-S. The V1 was as quick as the AR1, and I hear that the V2 is quicker than the AR1. I'm getting some V2s installed tomorrow. I haven't tried the RE71RS because I don't want a taller and/or narrower tire than what I've been running and I haven't personally seen any evidence that it is a quicker tire.

I've seen a ton of evidence RE71RS are faster. But maybe not for every car...

Locally, the folks who first got REs got faster and now that most are on REs those early adopters are back closer to their normal results.

We've also noticed that street class cars have the largest gains, so cars that can't run a lot of camber seem to do the best on REs, AS and SS Boxsters and Caymans seem to have made some major gains. In ST classes and others who can run camber plates and a lot of camber, I'm not sure the REs are as large of an advantage.

For our cars in CAM, it's also harder to say, I can't say the guys who switched to REs are now much faster, I was lagging a bit but after putting on new Falkens I gained a lot of time and the results are now pretty close to what they were. Some testing has resulted in REs seeming faster but I question that as there are too many uncontrolled variables.

I can say REs are far better cold vs Falkens and seem to take heat just as well, so they have a much broader sweet spot where they are fast, this is a pretty big advantage even if they're not much faster vs Falkens at ideal temps.

Falkens also fall off pretty quickly after they're half worn, and by the time they're close to wear bars they are trash, and they have a progressively narrower sweet spot as they are used as well.

[carguy55]

I have a Mustang buddy that runs the 315 A052 on track and I asked him how many laps he gets before they overheat, he said 1. lol

Several buddies have the new V2s, waiting to see how those work.

My experience with the 18" 315 Z214 vs 19" 305 G3R is the Z214 was a 2:06 vs 2:03 lap. Of course they're good for only about 15 heat cycles for they start to fall off. They're $1,687 a set with tax and delivery.

https://hankookmotorsports.com/produ...37854010474663

[mlee]

Originally Posted by cdrptrks

This is key. If you want to be able to do 20-30+ minute sessions without the tires overheating badly I would vote for 3R or slicks. Super 200 tires can do a few fast laps which is ideal for Time Trials on a track you know welll but they won't last anywhere near a 20 minute session on heavy cars without overheating from what I've heard/read. For example people spray RT660 and A052 tires with cold water between autocross runs that last less than a minute to cool them down.

Even Supercar 3 tires benefit from cooldown laps during a 20+ minute session if you're driving at a fast pace.

RT660 tires are listed as having a similar warm up, heat tolerance, and pace to Supercar 3 tires here but I think the warm up is actually much better on RT660 considering how it is popular for Autox but nobody at SCCA AutoX Nationals last year was using Goodyear street tires and considering how much trouble I have had warming Supercar 3 tires up the times I have autocrossed with them: https://grassrootsmotorsports.com/ar...-buyers-guide/

Attachment 1131688

That chart is spot on... good stuff

[Scargoes]

Originally Posted by DaveC113

I've seen a ton of evidence RE71RS are faster. But maybe not for every car...

Locally, the folks who first got REs got faster and now that most are on REs those early adopters are back closer to their normal results.

We've also noticed that street class cars have the largest gains, so cars that can't run a lot of camber seem to do the best on REs, AS and SS Boxsters and Caymans seem to have made some major gains. In ST classes and others who can run camber plates and a lot of camber, I'm not sure the REs are as large of an advantage.

For our cars in CAM, it's also harder to say, I can't say the guys who switched to REs are now much faster, I was lagging a bit but after putting on new Falkens I gained a lot of time and the results are now pretty close to what they were. Some testing has resulted in REs seeming faster but I question that as there are too many uncontrolled variables.

I can say REs are far better cold vs Falkens and seem to take heat just as well, so they have a much broader sweet spot where they are fast, this is a pretty big advantage even if they're not much faster vs Falkens at ideal temps.

Falkens also fall off pretty quickly after they're half worn, and by the time they're close to wear bars they are trash, and they have a progressively narrower sweet spot as they are used as well.

That's why I said I haven't see the evidence personally.

So, you are saying the pace of the REs is nearly the same as the RT660s? If that's the case, I'll stick with the CR-S as I averaged 1 second quicker in my testing when I pitted the RT660 and CR-S V1 against each other.