Vehicle Covered in this Guide 2016 Porsche 981 Cayman GT4
Rear Toe Link Clearance
APEX 19x11" rear wheels require the installation of aftermarket motorsport style rear toe links from companies such as Tarett, GMG, SP Motorsports, or BBi to achieve the clearance needed for the reduced wheel diameter. This will also allow you to correct your toe setting when dialing in more negative camber at the rear. APEX 19x10.5" rear wheels do not require this modification.
Brake Clearance Information
In the engineering phase of wheel development we 3D scan factory brakes and review 2D aftermarket brake templates in order to optimize our barrel profiles and spoke curvatures. As a result, our wheels offer massive brake clearance so you can run the smallest possible wheel diameter.
* The factory yellow 6 piston 410mm PCCBs require 20" wheels for proper clearance. Read our article for more info.
Bolt Pattern
5x130
Center Bore
71.6mm
Lug Seat
R14 Ball Seat
Thread Pitch
M14x1.5mm
Easy upgrades for street-driven cars
Wheels
Tires
Wider fitments for enhanced performance
Whether you enjoy modifying your GT4 for spirited street driving and canyon runs, or you are a hardcore track junkie chasing lap times, these wheel & tire configurations are best suited for enthusiasts looking for a dramatic improvement in performance and handling. These fitments incorporate wider 9” front wheels which provide superior tire sidewall support over the the factory 8.5" front wheels. A wider front wheel and tire combination will increase front end grip and close the stagger from front to rear resulting in sharper turn-in and less understeer. This is one of the easiest and most effective improvements you can make to your Porsche from a handling perspective.
We've optimized the offset of our 9" front wheels to be a direct fit with 245 and 255 wide tires, and although some 265 wide front tires can work by maxing out camber to -1.9º by sliding the factory top hats all the way in, we recommend installing adjustable camber plates with a minimum of -2.5º for added fender clearance and improved handling.
If you plan to track your car, we highly recommended dialing in negative camber regardless of wheel/tire fitment. It is vital for extracting the most performance and longevity out of your tires, and without the proper amount the outer shoulders of your tires will wear out prematurely and running tire costs will dramatically increase.
Wheels
Tires
Wheels
Tires
Wheels
Tires
Track focused fitments that require significant modifications
Many GT4 owners are inspired by the GT4 Clubsport and inquire about running an 18" wheel and tire configuration. 18" wheels will reduce rotational mass, decrease running tire costs, and open you up to racing slick compounds only offered in this diameter, however, the standard 6 piston 380mm steel brakes found on the road-going GT4 will not clear an 18" wheel barrel from any wheel manufacturer.
To overcome this barrier, owners will purchase and install PFC brakes very similar to the brakes found on the Clubsport. The PFC BBK is quite an investment, therefore, many owners have opted to go with factory 997.2 GT3/GT3RS 6 piston 380mm front brakes as a more cost effective solution. The good news is that our 18" EC-7RS & VS-5RS forged wheels offer massive brake clearance, and were engineered specifically to clear both the PFC Sport kit (pn 0.380.0001/2 Sport), as well as the factory 997.2 GT3/GT3RS brakes. * They do not clear the PFC Race kit.
Wheels
Tires
Brake Clearance Information
In the engineering phase of wheel development we 3D scan factory brakes and review 2D aftermarket brake templates in order to optimize our barrel profiles and spoke curvatures. As a result, our wheels offer massive brake clearance so you can run the smallest possible wheel diameter. The following brakes have been tested and confirmed to clear our wheels.
Fill out our Fitment Recommendation form Call us: 925-245-0773 Email us: support@apexraceparts.com