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YOUR RESEARCHTire replacement
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235 would be better, however they only appear
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I suspect 235 would be better, however they only appear to come in 40 series, and so again, I would be increasing the diameter.
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My car came to me with PS2's, but the hydro planing made me think it was the brand of tires.
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Suspected cause · Original poster
My local Discount Tire dealer has been very patient, but I suspect he will start running for cover soon.
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It wouldn't hurt to clean your wheel sensors while you are at but I'm not sure that has much of an effect.
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Suggestion
Even with the 9" wheels, I still recommend 225/40 and 265/35.
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I had a rear tire separate between the belts along the inside shoulder. This clearly led to examining my tires more closely, and it turns out my fronts were manufactured in 2006 and rears in 2011. So� new tires needed all around. I use 285/30/18 and had quite a bit of trouble finding much of a selection of this size tire that were in stock at various outlets. I've settled on Michelin Pilot PS2s. I am hopeful the tires will provide good grip for canyon runs, and last a reasonable amount of time (longer than R tires). I purchased the car in July, and noticed the braking was not as good as previous 911s, the car seemed to go into ABS mode far too easily, before what I would have expected the threshold to be. Now I wonder if this was simply because my 10 year old fronts were hard as cold rocks and couldn't offer any grip under braking, thus triggering the ABS? The tires will be mounted next week, and I'm anxious for a test drive, but I wondered what others think.
The inside shoulders of the rears need frequent monitoring as they generally wear faster than everywhere else. The more aggressive your alignment (camber), the greater the accelerated wear. Check them frequently (yes, you'll get your hands and knees dirty).
As others suggest, get the new tires mounted with a full 4-wheel alignment. Then see how the braking and ABS function. My guess is that it'll be much different and much better. GL!
Pilot super Sports are cheaper and a better tire. If you don't have AWD, 225/265 works very well for the street.
As for the ABS, if it is an initial shudder on the front end and not full ABS engagement, you probably need to bleed your lines. It wouldn't hurt to clean your wheel sensors while you are at but I'm not sure that has much of an effect.
I just had an alignment to basically stock settings, about 150 miles ago, so hopefully I am ok there. I hadn't considered bleeding the brakes, but it seems like a good idea just to make sure that isn't a contributing factor.
As for the Michelin Super Sports being a better tire than the PS2, I didn't find much information comparing the two tires. I did read positive reviews of both, and the PS2 has a lower wear rating which I assumed to indicate a softer tire, as well as the correct size 30 series profile rather than SS 35 series profile. I also found availability issues with some of the other choices in this size. I'm open to suggestions, since the tires aren't here yet, I imagine I could change to a different tire if there is enough evidence or experience from others to warrant it. Thoughts?
I've been very pleased with the Yokohama AD08R's. They come in 285 for the rear. My only complaint is hydroplaning after they get more than about half tread wear, but maybe all tires would be similar?
If you haven't had a brake fluid flush in the past year it should be done now.
PSS is a better performing tire for general overall driving than the PS2
Look at Sumitomo HTR ZIII. It is a great performing street tire. They are about 50% the cost of Michelins.
Slaker, thanks for that link indicates exactly as you suggested, that the SS would be a better choice, but I'm concerned about size. Would you think the 35 seriesis not a negative factor over the 30 series profile of the PS2? I understand the speedo error of the 35 series tire is actually in favor of being more accurate, but what about handling and acceleration? Are the pluses of the SS tire enough to offset the slight negative of slower acceleration due to larger rear wheel diameter of the SS?
I definitely think they are worth it on the street. The SS is a phenomenal tire and you would be hard pressed to tell a 2.4% diameter difference even with a stopwatch. For on/off ramps, canyon runs etc... they perform extremely well.
As for on the track, I really dislike the PSS or any street tire for that matter. Once they start to squeal, that's all you get. If you ask for more, you lose all the grip they had. If that makes sense.
Yes, makes sense. I wish they made more 18" sizes, I would be inclined to go to a slightly wider front tire, as my 225s in front look a bit narrow on my wheels. However, there is not another option in the SS.
I meant the tire looks too small for the rim. My fronts look to be 9", and have 225/40/18. I suspect 235 would be better, however they only appear to come in 40 series, and so again, I would be increasing the diameter.
I may look closer at some other tires that offer performance close to the Mich SS, but come in a better selection of tires. Again, I'm open to suggestions.
Changed my order and now expecting 285/35/18 Michelin Super Sports and 245/35/18 fronts. According to the tire specs the 245/35 should be a better fit for my 9" front wheels. Thanks for the tire advice everyone.
This sounds exactly right to me. Like pretty much every modern car, the brake bias is toward the front; when you're trying to stop 1.5 tons of car on cold, decade-old tires, the ABS will be chugging away - especially if you're doing any kind of turning during braking.
FWIW when I bought my 996 it also had (too) old PS2's on the front...plenty tread but a very similar experience to yours. New tires made a world of difference.
I Love the Super Sports, But they have very soft flexible sidewalls which I add 2psi to compensate for.
I would Not install shorter tire on the front & taller tire on the rear to increase snap oversteer potential & slow acceleration!
Hmmm. Can you elaborate on the handling effect this combination will have? I understood the larger tire diameter in the rear will have a small effect on acceleration, but not noticeable. I don't want to make a serious mistake that will cause handling problems. Arghhhhh. Confused.
I'm frustrated and a bit confused. I looked at the Tire Rack calculator, and the 285/35/18 is 4.9% larger rolling diameter than the 285/30 I have now. It seems like enough to incur noticeably decreased acceleration, and there is not a front that matches the rear rolling diameter. So that leaves me back to PS2s with the 285/30 and I can increase front width to 245/35 and have the same rolling diameter as the rear 285/30.
I could go with Bridgestone S-04 Pole Positions, and do 285/30 and 225/40 also. So what makes the most sense between correct size that won't adversely affect handling, and better tire? PS2? PSS or S-04?
Either way, it looks like once again I need to change my order. My local Discount Tire dealer has been very patient, but I suspect he will start running for cover soon. I need advice, and apologize for my beating this to death.
285/35 is going to be a little big. Although I don't think you have to worry about snap oversteer if you go that route. Lol.
Even with the 9" wheels, I still recommend 225/40 and 265/35. It's a good setup. 245, especially on a 9" wheel, can have some rubbing problems depending upon your ride height.
My rear wheels are 11", so I feel 265s are really too small.
If I go with PSS in 285/35 with 25.9" diam. then I could do 235/40 in front and get 25.4" diam. It would be less difference between Frt and Rr diam than the 245/35s would be. 225/40 gives me 25.1" diam.
However I continue to be worried about the overall diameter gain the 35 series rears creates, and am wondering if I should just stick with the stock 30 series 285s and 40 series 225s in the PS2 or S-04.
It certainly appears so. However I'm just trying present the variables in order to get some sound advice from people with more experience with this type of car. I'd prefer to make the best decision prior to purchase, rather than have a guy behind a counter, with no Porsche experience, just sell me tires and later find out it was a bad choice.
Posted by Triple Black " My only complaint is hydroplaning after they get more than about half tread wear, but maybe all tires would be similar?"
This has been my experience as well. Once my rears get about 50% worn, I start looking for new tires. My car came to me with PS2's, but the hydro planing made me think it was the brand of tires. Switching to Sumi's solved the problem (and I like them), UNTIL they got about 50%, and then they would cut loose on wet roads without much effort. They're cheap enough that now I replace them before they get to that point.
Question. My car was lowered before I bought it and I could not get the alignment exactly right with 4 new tires. Camber was tilted in. Handles and stops great but Is that normal?
That certainly has not been my intent, sorry if it has come across that way (?).
When I purchased the car in July, the car had been lowered on PSS9s, it also had HRE wheels on it. From my measurements with the existing tires on the wheels, they appear to be 11" rears and 9" fronts. There are no markings to confirm this. I do not experience any rubbing anywhere. I don't have any additional information on the wheels, nor did I know how old the tires were until I had the belt separation and was told the age by the tire place.
I'm just trying to get advice on the best combination of tire fit, availability, and performance. I clearly made some hasty choices in ordering, and now simply want to make the best choice, using advice from this forum. My local tire shop has been accommodating but not very informative or offering any real guidance. They seem to just want to sell me any tire. I appreciate any help, and am not trying to be difficult.
Thank you for your help. I spoke with Damon from the Tire Rack, he was extremely helpful and patient. On his suggestion, I took the front wheels off the car and measured rim width carefully and it appears to actually be 8.5". Consequently the original equipment tire specs made the most sense. SO� I have purchased (finally) Yokohama Neova AD08 R in 285/30 and 225/40. They are in stock, and should be shipped and mounted before the weekend. I'm grateful for everyone's help and patience. I also apologize that I completely forgot about the separate Wheel and Tire Forum where I should have started this thread.
