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best the car ever was at dual (street/track) use
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I did a couple track days and a bunch of street miles on that setup running Ohlins suspension and it was the best the car ever was at dual (street/track) use.
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Run 235x40x18 and 285x35x18 michelin all season 4s
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Don't get me wrong, I have a couple of sets of 8 and 10 wheels and on one of them I run 235x40x18 and 285x35x18 Michelin All Season 4s.
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ETA - I have run the PS4S in those sizes on stock 5 spokes and it rocked.
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That said the cup cars ran taller tires in the back then the front but they were spending their time at higher sustained speeds.
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Another factor, just to drive home this isn�t (yet) a track toy, the car will also be used on 60-100 mile weekend road trips for wife and I as well as nice weather trips to the office on Fridays etc.
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I remember hearing that the fast guys running 996s were running a 285 30 and 245 35 combo back in the day but that may have been limited by class restrictions.
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I have been of the mindset with regards to track use to copy what the Cup cars do as long as it's feasible as would be evidenced by the stupid wide fronts I run currently.
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best the car ever was at dual (street/track) use
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I did a couple track days and a bunch of street miles on that setup running Ohlins suspension and it was the best the car ever was at dual (street/track) use.
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I received my Apex wheels for my 996.1 C2: 18x9f (et46) and 18x11r (et60). I will be lowering a little with Feal coilovers. The car will not be tracked with this setup, but will get driven aggressively when the roads allow. Otherwise, just a fun street car.
My current thought is: 235/40 for the front and 285/35 for the rear. I live in Texas, and the car will only ever see wet roads if it starts raining while I'm already out and about in it. Highly doubt it'll ever see snow.
Looking at:
Michelin PS4s - obvious reasons
Conti DWS 06+ - not a strict performance summer tire, but the rear is 2.5 lb lighter than the PS4s. Thinking every little bit helps with a sub-300hp car with weight over the rear. I had the first DWS06 on my 2008 SRT8 Jeep and really liked them.
So, looking for feedback on
both
the size and then which specific tire for my uses.
What temperatures do you foresee yourself driving in? If regularly above 40*F, then I think the Continental ECS 02 is a better choice than the DWS.
And the shorter tire is for better acceleration.
Standard 996 sizes are shorter in the rear.
For your standard 8x18 its 225x40x18, 10x18 is 285x30x18. For 8.5x18 its 235x40x18, 11x18 is 295x30x18.
With 9s in front you can run 245s with 295s in the rear, but you will have a rather tall front in relation to rear. Hence the 235 suggestion.
ApEx has on their website suggested sizes and tires by weight.
Edit: corrected Typo on standard wheel rear wheel size on 10x18. It is NOT 285x40x18 it is 285x30x18. Apologies for the fat finger mistake.
Yea pretty rarely below 40 degrees here.
Agreed on the ECS 02. Again, the only reason I was considering the DWS was the 2.5lb lighter spec. Plus in my OP, the ECS02 didn't come up as an option in those sizes.
I’ll second GC996’s size suggestion. Granted you have a C2 so it’s not crucial, I like to keep tires close in diameter unless it came as such originally.
Do you mean Pilot Sport 4 or Pilot Sport 4S? I had Conti Extremecontact Sports on my Boxster as its last set and I was rather pleased with the overall performance. I have PS4Ss on my C4S.
I'll give you one more item to look at which is to check the actual width measurements of the tires you are considering. Not all manufacturers 225s, 235s, 245s, etc have the same rubber width. Using 235s as an example, If you want a more robust front tire width, find a manufacturer with wider 235s. If you need to save space because of lack of camber and/or tighter wheel wells then you may want to choose a narrower tire in the size you are looking at. You can see all the measurements on tirerack. Point is that just because its a 235x40x18 doesnt mean all tires are the same height and width. They vary by tire manufacturer.
True, but the section width they list is also with varying rim widths, right? So as long as the rim width they used to measure is the same across choices, it should be a good comparison. Maybe they use the same wheel width to measure all tires within a certain size though, I haven't looked at that spec enough to notice yet.
From a handling standpoint in regards to actual tire width, do you want as much contact (tread width) as possible, or do you want there to be less spread between the measurements of the tread width between front and rear - closer to "square?"
I would run the tire sizing you�re leaning towards and the PS4S.
In my opinion, the taller rear sidewall only offers benefits with all that weight back there.
ETA - I have run the PS4S in those sizes on stock 5 spokes and it rocked.
Notice any negative effects going to a taller tire without changing anything else? I'm going from 19" wheels that the previous owner put on mine, so I should be a little bit shorter with either of the two options listed in this thread, I think. Definitely less weight.
No negative performance impact I could feel and the taller sidewall looks better.
I did a couple track days and a bunch of street miles on that setup running Ohlins suspension and it was the best the car ever was at dual (street/track) use.
Reading back on this - the tire size you mentioned for OEM 10x18 (285/40) is not shorter than the 8x18 front you listed (225/40). Typo?
Also, what about going with 245/35 (~24.8" tall) and 295/30 (~25" tall) - rough ride?
Edit: I just caught the Typo. Should not read 285x40x18, it should read 285x30x18 for the standard factory size on 10x18 wheels. My apologies. Fat fingers.
Keep in the back of your mind that your new APEX wheels are not standard size at 8 and 10. They are substantially wider at 9 and 11. So you will need to go wider than 225 & 285. Hence the 235 & 295 suggestion.
But yes, 285x30x18 is not as tall as 225x40x18. The same can be said for 295x30x18 not being as tall as 235x40x18. The difference in both depending on the tire you run is approximately 0.5 inch. This is the standard differential from the Porsche factory.
As I mentioned, you can go to APEXs website and they will give you tire size recomendations for your wheels as well as recomendations for tires. I would even suggest giving them a call and picking their brain on suggestions.
Also, you can go to tire racks website and they provide all of the tire measurments so you can see height and width and play around with scenarios.
I would take a few more days before ordering a set of tires so you can continue to ask questions and get your arms around what option makes the most sense for you.
In answer to your question, sure, you can go with 235x35 or 245x35s in the front, but it will be a rougher ride. Nothing wrong with that because the front end will be more responsive. Or you can go with 40s in the front and 35s in the rear to add more cushion. But my preference would not be to run 285s on 11 wheels due to a skinny configuration.
Don't get me wrong, I have a couple of sets of 8 and 10 wheels and on one of them I run 235x40x18 and 285x35x18 Michelin All Season 4s. It's a very cushy ride. But nothing I would use on the track or canyon carving because it's too soft.
You have any options. I would start with a call to APEX.
The taller the tire the heavier it will be and the more rotational Mass it will have. Your gearing will be a little higher, and the tire/ wheel combination will be harder to accelerate or brake. That said the cup cars ran taller tires in the back then the front but they were spending their time at higher sustained speeds. And they had more power.
Why does Porsche spec tires with lower aspect ratio than what they compete with? Maybe z-bomb knows. I've been curious and maybe someone can contribute. I remember hearing that the fast guys running 996s were running a 285 30 and 245 35 combo back in the day but that may have been limited by class restrictions. Certainly the 285 30 would be quicker than bigger diameter and heavier tires.
I would not call myself one of the fast guys but my track tires have always been either a 285 or 305/35. The higher aspect ratio comes with a much higher load rating which in my opinion was always preferable for the type of abuse the tires would see on track. I see the higher load rating a benefit for the road also with the unpredictabilities that come with road use as well as the fact that a little more sidewall will offer some mechanical forgiveness protecting the wheel.
I have been of the mindset with regards to track use to copy what the Cup cars do as long as it's feasible as would be evidenced by the stupid wide fronts I run currently.
I have always preached run the tallest sidewall you can all else being equal cause it worked so well for me, and I don't see any real advantage given the choice to going to a thinner sidewall. The weight difference is inherent to getting more rubber in contact with the road, the more rubber in contact with the road the more grip you have, a trade off I'm willing to make every time for a car that is not severely underpowered as my opinion is any weight penalty is way more than offset by increased cornering and braking grip.
There are alot of ways to set up the m96 powered 996 with tires, tire sizes and suspension set up. For HPDE it comes down to what you like. For Club racing it comes down to rules. For all of us it comes down to what tires are available in what sizes.
I think the Michelins are a great tire, but I do want to warn you (01svtL) about their fitment on Apex wheels.
Michelin constructs their tires with unusually narrow beads, which don�t always seat well on Apex wheels. As such, they�re prone to leaking air at the beads.
Not trying to scare you, but I want to let you know that this scenario is possible. There are reports of people who�ve encountered this scenario, but remedied it through various solutions. I�m sure there are also plenty of people who�ve installed this wheel+tire combination without any issue, but never shared it online because a success story ought to be a normal occurrence.
So there�s a possibility that this combo may cause you and your installer some headaches.
Interesting, you should let Apex know as they call out the PS4S as the staff selected preferred choice in many 996 instances on their site.
https://apexwheels.com/fitment-guide...-fitment-guide
I posted here and emailed my salesman over at Apex in tandem - got a reply from him last night. He said most of his 996 customers go with the setup you mentioned: 235/40 and 295/30 as it is the .2 GT3 setup.
They�re aware of it. Although I haven�t checked, I assume they also list Michelins as their preferred tires for other car makes and models.
It�s not impossible to make this combo work - there are obviously people running it successfully - but there have been some that needed to put forth a bit more effort to do so.
I will throw my 2 cents in. The fastest combination I have found on my 996 is 245/35 315/30. I have a set of 235 295 of what should be a grippier tire. I both sets a lot at lime rock because I don't want to waste the wider tires there. I'm always a second or a little more slower on the narrower tires, that' a one minute lap. If i was going to use a 235 in the front I would have gotten a 8.5" wheel.
Also remember the stock rear size for your year was 265/35.
It looks like there's only a handful of options in this size. The Continental Extremecontact Force is probably the only one I'd consider due to the weight of the others. While on a track, the 2-3 lb more may be offset with better grip, this setup will likely never see a track, so overall acceleration on the street is probably more important to me than absolute grip. Additionaly, more rubber contact on the road negatively affects straight line acceleration, right? Not sure if the difference between these two setups would be noticeable in that regard, BUT, the 315/30 EC is 2 lb heavier AND taller than the 295/30 ECS02 combo, so the three combined (more contact, taller, heavier) may be noticeable on the street. Thoughts?
If you want something sticky and light that is available in an abundance of sizes, take a look at the Bridgestone RE71RS which are excellent 200W tires.
However, they are soft sticky rubber and will wear much faster than a street tire, but you will get incredible grip in the dry. Good in light rain. Never drove them in moderate to heavy rain. Nor do I want too.
Interesting. I've been running Apex SM-10 wheels with PS4S 235/40/18 and 295/30/18 for some time now and have not experienced any issues with pressure loss. I think they actually fit great on the rim and do not have the rounded off side wall, which I prefer.
Looks like they are available in the 295/30, but not 315/30. The Conti 315/30 are 2lb lighter than the RE71RS in 295/30 and only .4� taller. So many damn considerations. If it had another 100hp it would be easier to decide haha. Or hell, even 50.
Another factor, just to drive home this isn�t (yet) a track toy, the car will also be used on 60-100 mile weekend road trips for wife and I as well as nice weather trips to the office on Fridays etc. So while I�m not saying I need 20-25k miles out of the tires, 10-12k with quite a bit of spirited driving around town would be good.
https://www.omnicalculator.com/physi...ent-of-inertia
I use this calculator to compare tires. It�s obviously not perfect, since you have to assume that the weight is concentrated at the tread, but it ought to give you a general idea of the trade offs.
Select �circular hoop� shape, and insert the weight and radius of the tire according to Tire Rack�s measurements. It�s important to use Tire Rack�s measurements because they have a method for obtaining consistent, precise measurements.
I use the resulting values to compare them as a percentage change.
I also calculate a value for my current tires, so that I can have a baseline value. I�m happy as long as it�s an improvement from my current setup.
That�s reassuring, thanks for sharing. You expect tires to mount to rims, so you typically never hear the success stories - you really only hear the horror stories.
But your experience is helpful to highlight that this combo usually works well together.
Imho, I would still go with 235x40x18 and 295x30x18 for street tires on your 9 and 11 wheels. Save the exotic sizes for your track wheels if you decide to track it. It will make a lively thread topic sometime in the future.
8.5" and 11" actually. I had them since 2021 and initially ran General G Max RS (basically a Continental, made in same factory, just different mold) tires in that size and then upgraded to PS4S and never experienced any issues with pressure loss that would have me concerned. Could it be down to a bad install or the valves being bad? I don't know but possible!
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