brewerbry

There is a great resource on the Apex site that provides a lot of the info you are looking for https://support.apexraceparts.com/hc...-Fitment-Guide

ramans

Thank you, I saw that given that I have Apex wheels, it doesn't really provide info on availability or peoples opinions of how the tyres compare to the ones that we had been running. Good to know on the sizing they suggest I would hope those would work, but the factory sport suspension lowering the car over another 1/2" or more would likely run into some big issues...

brewerbry

I have run the re-71r's like you and loved them! I then had rs4's and while they wore like iron was never in love with their grip. I now have Nankang ar1's but have yet to have them on track (am hoping to run them tomorrow but it is looking like rain and I am not super confident about them in the rain!)

sonorous

For Hankook RS-4 availability check hankookmotorsports.com. I just ordered a set for my Clubsport and there is very good availability of 18" sizes.

Apex Wheels

Do you have GT3 lower control arms and or camber plates installed? What are your current alignment settings? Aside from the handling and tire wear benefits on track, negative camber (when dialed in at the top with camber plates) will allow you to run wider front tires.

As others have mentioned, if you are looking for a track capable compound that has really good longevity, Nitto NT01 and Hankook RS-4's should be at the top of your list. These two tires wear like iron, with the NT01s being the faster of the two. The main issue with the NT01s right now is that Nitto has been backed up on the 275/40-18 production for over a year now. The Goodyear Supercar 3 is another decent choice.

If you want a 200 tread wear tire that is capable of quicker lap times at the expense of longevity, the Yokohama A052, Falken RT660, Nankang CR-1 and new Bridgestone RE-71RS should all be considered.

245/40-18 front, 275/40-18 rear is a great configuration for enthusiasts with limited negative camber, and plays nice form a rolling diameter standpoint. For more experienced drivers looking for more grip with a healthy amount of negative camber dialed, the 265/35-18 front, 295/35-18 rear A052s are a very popular choice.

The other two tire configurations listed in between are also commonly used (as some desirable compounds are only available in these sizes), but they do have a shorter rolling diameter which leads to a lower ride height, larger wheel gap (unless you are on coilovers), etc.

Wheels

• Front: 18x9" ET46 // Rear: 18x10.5" ET44
  • Available in our new Forged EC-7RS & VS-5RS wheel designs

Tires

• APEX Staff Pick: Front: 245/40-18 // Rear: 275/40-18
  • Typically a direct fit, but we encourage a little additional negative camber up front
  • Extreme Performance Summer: Yokohama A052 (240 TW), Hankook RS-4 (200 TW), Goodyear Supercar 3 (220 TW), Nankang CR-1 (200 TW)
  • R-Compounds: Nitto NT01 (100 TW), Nankang AR-1 (100 TW)
  • Semi-Slick: No options currently available

• Alternative 1: Front: 255/35-18 // Rear: 275/35-18
  • A minimum of -2º of front camber is recommended
  • Extreme Performance Summer: Hankook RS-4 (200 TW), Dunlop Direzza ZIII (200 TW), Falken RT660 (200 TW), Nankang CR-1 (200 TW), Bridgestone RE-71RS (200 TW)
  • R-Compound: Nankang AR-1 (100 TW), Toyo R888R
  • Semi-Slick: Hoosier R7 & A7 (40 TW)

• Alternative 2: Front: 255/35-18 // Rear: 295/30-18
  • A minimum of -2º of front camber is recommended
  • Short rolling diameter front & rear
  • Extreme Performance Summer: Yokohama A052 (200 TW), Bridgestone RE-71RS (200 TW)
  • R-Compound: Nankang AR-1 (100 TW), Toyo R888R (100 TW)
  • Semi-Slick: Hoosier R7 & A7 (40 TW), Toyo RR (40 TW)

• Alternative 3: Front: 265/35-18 // Rear: 295/35-18
  • A minimum of -3º of front camber is recommended
  • Extreme Performance Summer: Yokohama A052 (200 TW)
  • R-Compound: No options currently available
  • Semi-Slick: No options currently available

- Ryan

ramans

Thank you I have GT3 LCS and Tarret hats on the front of the car, so I'm good with negative camber, I'm running your wheels SM-10 wheels in 8.5 and 10, not sure how wide I can go on those, but I've got a set of the Super Car 3s coming now to try out. Big issue of course is clearance on trailer, jacks and lift when the car is lowered that much more than the X73 lowers it. But I'm curious to see how they'll run.

Apex Wheels

Great to hear that you have the adjustability that you need to adjust camber. You can run up to 255's on your 8.5" wheels, however, that tire size performs a bit better on our 9" front wheels which is what we recommend for track applications.

- Ryan

txbdan

I run Titan7 18x9"s and 18x10"s. -2.75deg front camber.

I've run
235/45 265/45 RE71Rs (stock size)
235/45 265/45 Yoko A052s (stock size)
245/40 275/40 Yoko A052s (shorter so better gearing, but watch lower ride height if your suspension is x73 or low)
255/40 285/40 PS4S (same diameter as stock)

Yoko are fastest, but wear quickly. RE71Rs are discontinued. PS4S are slow, but feel decent, good in rain, and wear pretty well, I ran them for One Lap. If you want a good middle ground do-all track 200tw, I'd look at RT660s.

Yggiz

I just put on new set of RT660 on my 14C in those sizes.
245/40/18 Front
275/35/18 Rear
I only tested them on the street and so far okay. No rubbing, no codes due to size difference.
I will autocross this weekend so this will give me better idea if this size actually works.
The car sits almost 1" lower in the rear than stock.

ledbette

Curious why you didn't attempt to keep the same profile on both front and rear, or choose a wider rear to keep the front/rear diameter ratios more consistent? The wheel speed sensors will definitely indicate the rears are rolling faster than the fronts, but maybe the software is smart enough to auto-calibrate for that. I'm curious if your ABS or traction control will be a bit more twitchy with the disparity.

txbdan

Yeh that's an odd choice. Your rake will also be off. The rears should be 1" larger in diameter than the fronts, but your rears are a little shorter than the fronts. Curious to see if anything goes wonky with the electronics at autox.

Yggiz

My choices were based on wanting to go with good autocross tire without going broke. I also had one other person telling me that these were the same exact sizes he went with with zero problems.
The RT660 are not available in our stock size and tires that are available are very limited. I wish they made 275/40/18 and even improved it would still be off from the stock.
Last year I was on stock sized P-zeros and they are horrible for autocross or track so I'm hoping for improvement.
I also autocross on my other car with RS4's and even though they are good and long lasting they are not as fast as Falkens.

Yggiz

Over the weekend I autocross with my mismatched tires 245/40/18 front and 275/35/18 rear RT660 Falkens.
At the autocross we did over 25 runs between my wife and I without any problems.
My TPMS settings are set to - winter tires 18".

brewerbry

I ran Road America with my Nankang AR1's in Front: 255/35-18 // Rear: 295/30-18 and had zero problems with PSM - the tires are fast and wore pretty well but much faster speed and wear than Hankook RS4's

L76

Time to get new track tires for my Apex 18” setup. Currently running Michelin PS4S on

285/35/18 Rear
255/35/18 Front

Whatch’all think?

cheers,
L76