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Dave, are those 20" or 21"? If 21" as I suspect, do you know if 20" x 13 would fit? Obviously everything is different (but not) on the TTS and 2RS, but my car comes stock with 12.5" x 21 in the rear, fitting 325/ 30ZR21 Cup2 or Cup2R. If that all fit inside the wheel well and didn't throw off TC or PASM or the speedo, that would be an awesome fitment for TTS guys along with 9.5" x 20" fronts like the 2RS comes with. If you can figure out the offsets....hmmm.
The two cars I posted above are using 20"x13" with 335/30/20. With the offsets that we have there are no need for modifications to make it work. No lights come on the dash whatsoever. This is a plug & play fitment for the rear.
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You think a 265 is ok on a wheel that's 8.5" wide? I thought the 265's on the 9" wheel were already pushing it....
8.5" is definitely below the min. recommendation for the 265/35-20... Everyone loves to hate the centerlocks, but the extra 1/2" width is nice.
Can anyone confirm that when one ordered a Turbo S and optioned-out of centerlocks to 5-lugs, you got the regular non-S narrower five lugs? I assume that to be the case, but don't know for sure.
8.5" is definitely below the min. recommendation for the 265/35-20... Everyone loves to hate the centerlocks, but the extra 1/2" width is nice.
Can anyone confirm that when one ordered a Turbo S and optioned-out of centerlocks to 5-lugs, you got the regular non-S narrower five lugs? I assume that to be the case, but don't know for sure.
Yes, my Turbo S with five lug wheels came with 20x8.5", ET 51 and 20x11", ET 56.
Yes, my Turbo S with five lug wheels came with 20x8.5", ET 51 and 20x11", ET 56.
This is good to know. So then the standard 5 lug/10 spokes are the same regardless of S-trim or not. (Apologies - 2FckFast) but if anyone can actually confirm that they've mounted 265's on my piddly *** 10-spokes, I'd be grateful.
No one's mentioned anything about 325's in the rear so I'm assuming those won't be an issue.
I'm sure they would mount up, that's not the issue... And I'm sure there is some safety margin built-in (eg: it's not binary where 9" is completely safe and 8.5" is not safe), but the issue is how the narrower wheel with a too-wide tire affects the sidewalls. Presumably one would want the wider tire combo for performance, so also presumably one would be driving the car aggressively, so I'd say it's not a good idea to mount 'em up on wheels that are out of spec by the tire manufacturer.
If you have OE five lugs, stick with Cup 2's in stock sizes or get wider wheels?
I'm sure they would mount up, that's not the issue... And I'm sure there is some safety margin built-in (eg: it's not binary where 9" is completely safe and 8.5" is not safe), but the issue is how the narrower wheel with a too-wide tire affects the sidewalls. Presumably one would want the wider tire combo for performance, so also presumably one would be driving the car aggressively, so I'd say it's not a good idea to mount 'em up on wheels that are out of spec by the tire manufacturer.
If you have OE five lugs, stick with Cup 2's in stock sizes or get wider wheels?
Thanks for your note. Now i'm thinking 255/35/20 up front and 315/30/20 in the rears just to be conservative as opposed to pushing the fronts too wide and running the risks that you mentioned. Maybe that might be a good compromise.
So, this is what I am going to do, with the OEM 10 spokes, 11.5 inch wide rears, when my 245/305s are spent:
There is also a Cup version, but the diameter is slightly different. I believe Randy (earlier in the thread) ran those on some stock sized HREs. The computer should like the diameters, and a couple of other fellas have posted pics of how it looks - which is very good, especially lowered - so it strikes me as an easy upgrade when the time comes.
My current leaning, for what it's worth, is to go with Cup 2s, N1 rating, in the OEM size.
I'm not overly hung up on Porsche tire approval, and for most tires I bet there is very little difference, but if any tires were tweaked by Porsche engineers for optimum performance with the 911, it's likely the Cup 2, which are available with N1 rating in 245/315, but not in 265/325.
Pure speculation of course...
How different is the Sport Cup design and compound between Porsche N1, Mercedes K0, Ferrari K1, and 'generic' spec? I'd love to know...
I think that 'Porsche', Ferrari and MB spec is simply fiddling with compound and diameter more so than a major fundamental change in the design characteristics of the tyre - most certainly beyond my driving abilities to be able to notice outside of the differences between the PS3 and PS4 (M5, TTs). All the PS4 cars I have had the good fortune to try (MB, BMW and Porsche) all seemed to have the same (or at least similar) stickiness characteristics.
That being said, I have not driven on a new design Cup tyre, but a friend runs them on his GT3 and notes there is a very noticeable difference (grip improvement) when stepping up from the PS4 to the Cup. One day, when time is less of a concern, I'll build a set of custom wheels for the TTs and put some Cups on it - and will then avoid the rain...
Does anyone know if there have been pictures posted in this thread of a 991.2 TTS with OEM centerlocks (i.e. 9" wide up front and 11.5" rear) with 265/325 tires, especially MPS4? I would love to "see" how they look and tell myself there is no odd looking tire wall protrusion beyond the edge of the OEM centerlock wheels. I've been searching the forum and can't find pictures that would reveal that. Any suggestions would be appreciated!
06-18-2020, 02:31 PM
hmmm
