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I find it interesting that although the OEM rear wheel choices for the 718 vary from 9.5 x 18 to 10.5 x 20, the rear tire size remains unchanged at 265 mm?

Looking at the info supplied on the TireRack web site, it appears that my OEM tire (Eagle F1) in 265/35-20 is best fit on a 9.5" wide wheel.

For competition, Cayman/Boxster drivers routinely stuff a 255/35-18 on the front 8.5" wide wheel. Note that TireRack shows that size tire to best fit a 9" wide wheel. However, speaking from first-hand experience, I can tell you that it fits and works well on an 8.5" wheel.

So, my question is how wide a tire can we fit to the 10.5" wide rear wheel? Specifically, a 10.5" x 19" wheel?

Looking again at the TireRack info for the OEM tire, that data says a 295/35-xx is best fit on a 10.5" wide wheel. The 295mm tire has a 1.2" wider section width then the stock tire so it would roughly extend 0.6" more on each side. Looking at my rear suspension and wheel opening, I don't see how there would be any interference issue at all. In fact, the tire I'd prefer to run is a 305/30-19. However, its section width is 12.3" versus the stock section width of 9.5" on the OEM 265/35-20 tire.

According to TireRack, the 305mm wide tire is best fit on a 11" wide wheel but as with the 255mm tire on the front 8.5" wide wheel, I believe the 305 will fit the 10.5" wheel just fine.

My concern is would the 305mm tire rub the strut or worse yet, the fender? Note that the OEM 265/35-20 has a diameter of 27.3" while the 305-30-19's diameter is 26.2" so there would be 0.55" additional clearance vertically.

Comments???
 

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For anyone else researching this and coming across this post, I just put 19x9 ET49 and 19x11 ET49 SSR Professor wheels on my 2019 Cayman S with 265/35-19 and 305/35-19 tires. I even left the 10mm spacers on there I had installed for the stock wheels, and they fit fine. I am lowered on Godspeed springs, maxed out front camber at -1.4ish, but otherwise stock suspension. The rears are tucked in and look fine, but the fronts poked out just a little too far for my taste, no rubbing unless I practically jumped the car into dipping turns at high speed, but I took the front spacers off and now they all set equally flush. I am convinced you could fit 285/325s with the PERFECT offseet, maybe a little massaging of the front fenders.

More info at http://SpicyVW.com

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