Porsche 911 991 GT3 Wheel & Tire Fitment Guide

Vehicle Covered in this Guide 2014-2016 991.1 and 2018-2019 991.2 Porsche GT3

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 6 piston 410mm PCCBs require 20" wheels for proper clearance. Read our article for more info.

Rear Lower Control Arm Bolt Modification - Required for 19" Wheels

If you have steel brakes, downsizing to a 19" wheel and tire package is advantageous for many reasons including a reduction in weight and an increase in tire options. By decreasing the diameter of the wheels, the inner barrel of the rear wheels get quite close to the factory lower control arm "stabilizer bolt". To improve clearance, we recommend replacing the stock hex head bolts with Porsche 72mm pan head bolts - part # 999-073-530-01 which are under $10. 

Rear Axle Steering (RAS) Clearance

All 19" and 20" APEX wheels are optimized to clear rear axle steering.

Wheels

• Front: 19x9.5" ET50 // Rear: 19x12" ET46
• Available in: EC-7RS, VS-5RS, & SM-10RS
• Popular Fitment

Tires

• APEX Staff Pick: Front: 265/35-19 // Rear: 325/30-19
• Typically a direct fit, but we encourage a minimum of -2º camber up front
• Max Performance Summer: Michelin PS4S (300 TW)
• Extreme Performance Summer: Goodyear Eagle Supercar 3 (220 TW), Continental Extremecontact Force (220 TW)
• R-Compound: Nankang AR-1 (100 TW), Michelin Cup 2 (180 TW), Toyo R888R (100 TW), Goodyear Supercar 3R (100TW)
• Semi-Slick: Hoosier R7 & A7(40 TW)

Wheels

• Front: 20x9" ET47 // Rear: 20x12" ET47
• Available in: VS-5RS
• Popular Fitment

Tires

• APEX Staff Pick: Front: 245/35-20 // Rear: 305/30-20
• Direct Fit
• Factory GT3 Tire Sizes
• Max Performance Summer: Michelin PSS (300 TW)
• Extreme Performance Summer: Nankang CR-S (200 TW), Michelin PS Cup 2 240 Connect (240 TW)
• R-Compounds: Michelin PS Cup 2 (180 TW), Michelin PS Cup 2 R (140 TW), Pirelli Trofeo R (60 TW), Dunlop Sport Maxx Race 2 (80 TW)
• Semi-Slick: Hoosier R7 (40 TW)
• Alternative 1: Front: 255/35-20 // Rear: 315/30-20
• Direct Fit
• Max Performance Summer: Michelin PSS (300 TW)
• Extreme Performance Summer: Michelin PS Cup 2 240 Connect (240 TW)
• R-Compounds: Michelin PS Cup 2 (180 TW), Michelin PS Cup 2 R (140 TW) (60 TW), Toyo R888R (100TW)
• Semi-Slick: No options currently available

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:

• Porsche Steel 6 piston 380x34mm f. / 4 piston 380x30mm r. - 19" & 20" wheels clear
• Porsche PCCB 6 piston 410x34mm f. / 4 piston 390x30mm r. - 20" wheels required, read our article for more info.
• AP Racing by Essex CP9661 Front 6 piston 394x34mm - 13.01.10073 - 19" & 20" wheels clear
• AP Racing by Essex CP9449 Rear 4 piston 380x32mm - 13.01.10074 - 19" & 20" wheels clear