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Cayman Tires & WheelsDiscussion of Tires, Wheels, Suspension, etc.
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I posed this question to two Porsche parts dealers who were selling 911 wheels on ebay, they both told me that 911 offsets were for a narrower track (except for ones for 4, 4s, or turbo cars) and a 15mm spacer would be required for the wheels to fit.
John - try this link, if only for fun - not sure if I'd trust it to make a final decision because it wouldn't fully accomodate for wheel design for brake clearances.....Interesting at least to play with.
Will Carrera S 11" rear rims / tires fit on the Cayman? Spacers? And yes, I searched and read all the threads. Thanks.
John - Coincidentally, another member sent a PM to me asking the same question... I'll paste in below what I wrote back to him
brad
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Changing to a wider wheel/tire in the back, specifically 11" won't be a problem. you'll need to run a 275 or 285 wide tire back there on an 11" rim. 11" is about the widest you're going to get back there.
You'll need to get a new set of rear Carrera S rims, I'm not sure if the offsets would be different - I think they would be, in which case you'll need to make up for that difference with a wheel spacer. You should talk with your dealer or someone like Wheel Enhancement in L.A. about the offset issue. Wheel Enhancement (wheelenhancement.com) really knows Porsches and will know what you need in the way of getting the wider wheel to fit.
As far as tires go, like I said, you'll need to go to a 275, 285, or 295 width tire. What is critical in this case is that the overall diameter (in inches) of the tires be within 3% of the measurement of your stock OEM tires, and within 3% of the diameter of the front tires, too. otherwise your ABS and PSM may not work correctly - not a good thing
For instance, your stock OEM rears (if they're Michelin PS2s is 26.3" Your fronts are 25.5" in diameter.
I got this info from tirerack.com - look up the tires and then click on "specs"
For the new rear size, the 275/35s are 26.3" a perfect match. If you wanted to go to 285s, the 285/30s are 25.8" well within in the 3%. 285/35s are 26.9" which is just fine, too. 295/30s are 26" also good.
If you go to a wider tire in the back, I would highly recommend you put a wider set on the front, too, otherwise, the car will understeer more than it already does - which is already quite a bit. I would go to 245s in the front. 245/35s are 25.8" in diameter, a good match there, too. Wider than 245, and I think you'd have to get new, wider rims in the front.
PSM - Porsche Stability Management
While it can’t overcome the laws of physics, the revolutionary Porsche Stability Management (PSM) system does lend an added degree of balance and control to the Cayman’s mid-engine driving dynamics, inspiring surefooted confidence in corners and extreme situations.
A standard feature on the Cayman and Cayman S, PSM continuously monitors steering input, road speed, yaw velocity and lateral acceleration to calculate the actual direction of travel. If the car begins to steer off line, PSM instantly intervenes with precision brake inputs on individual wheels to help bring the car back onto the driver’s intended path.
If braking alone isn’t enough to correct the vehicle’s cornering line, PSM then calls on the Cayman’s engine management system, adjusting engine output as needed to help stabilize handling. PSM can also compensate in an instant for mid-corner changes in load resulting from deceleration or braking. When Sport mode is selected with the optional Sport Chrono Package, PSM’s threshold for intervention is raised, allowing for greater driver involvement. If you prefer driving without automatic PSM assistance, the system can be set to standby at any time. In this case, it will only intervene under heavy braking, where both front wheels exceed the ABS threshold.
For all of its technical ability, PSM goes virtually unnoticed in everyday driving situations, preserving the Cayman’s natural agility.
Wheel Enhancement
Nobody gives you more ways to get the look you want:
1. Purchase new Porsche Factory alloys.
2. Purchase like-new used or restored Porsche alloys from us.
3. Have us refinish your Factory alloys. We restore, anodize, polish and chrome plate.
4. Purchase our aftermarket wheels--we offer the very best, including Kinesis, Fikse, BBS, HRE and Champion to name a few.
5. Exchange your straight, true Factory alloys for Factory alloys pre-finished the way you want.
6. Exchange your scratched/curb damaged Factory alloys for new or refinished Factory Alloys.
7. Trade in your straight, true Factory alloys for aftermarket or Factory wheels. http://www.wheelenhancement.com
I fitted 997 turbo wheels which are 11" with 51 offset with 14mm spacers at the back with 295/30/19 Michelin PS2.
It fits perfectly without any rubbing with my H&R springs.
The fronts are 8.5" with 55 offset with 235/35/19 which are the same as the Carrera Sport wheels.
All the narrow body 997 11" rear wheels have an offset of 67mm which will need 30mm spacers which could be to much.
You can find 11" Carrera Classic wheels with a 51mm offset which will also work. They come from wide body 997's.
If you read the articles on Tirerack website you will see that the Porsche tires have diffirent grooves, composites and constuction. It also explains N0, N1 etc.
The sizes availablefor the 997 and 987 Porsches are 235(18"&19") , 265(18"&19"), 295(19") and 305(19").
I only use tires approved by Porsche for road use as extensive research has been done to ensure optimal performance.
My local Porsche Centre recommends Michelin's as these tires are superior to the other brands in all aspects.
Herman - let's seem some more photos of those turbo wheels. That's my favorite OEM wheel. Too bad Porsche doesn't allow you to option your car with those wheels from the factory.
__________________ Go Fast, Brake Late, Don't F*ck Up!
If you go to a wider tire in the back, I would highly recommend you put a wider set on the front, too, otherwise, the car will understeer more than it already does - which is already quite a bit. I would go to 245s in the front. 245/35s are 25.8" in diameter, a good match there, too. Wider than 245, and I think you'd have to get new, wider rims in the front.
Really good advice beez! It's one of the reasons I didn't go for an 11" rear wheel when I bought my Forgelines. They would have looked awesome and really filled the wheel arches, but I was afraid the difference in mechanical grip front-to-rear would induce too much understeer.
...of course with 3 piece wheels I could always buy a new inner if I was feeling nutz!
__________________ Go Fast, Brake Late, Don't F*ck Up!
I have installed the wheels with 14mm spacers in the rear.
It fits perfectly with H&R springs.
It looks much better than in the pictures.
These type of wheels have been sold on Ebay for $2600.
Cheers Herman
I know you used this set-up with H&R springs. Will it work with the stock spring set-up? I would prefer to go with the standard turbo offsets rather than the Cayman offsets so that I can use the wheels for my future 911. Thanks for your reply!
