S550 Shelby GT350 & GT350R Wheels

The GT350 runs 19x10.5 +30 front and 19x11 +62 rear from the factory. Most aftermarket upgrades step up to the GT350R-spec sizing — 19x11 +24 front and 19x11.5 +56 rear — which is wider and deeper concave. This is the R-spec fitment that Project 6GR's GT350 / GT350R lineup is built around.

The GT350 runs a narrower 10.5" front wheel at +30 offset. The GT350R runs an 11" front at +24 and a 11.5" rear at +56, with the factory carbon fiber wheels built specifically to that geometry. The R-spec sizing is wider, more aggressive in concavity, and the standard starting point for any serious GT350 wheel upgrade.

A rotatable square setup runs the same wheel and tire size at all four corners — typically 19x11 +50 with 305/30/19 or 315/30/19 all around. Because all four wheels are identical, tires can be rotated corner to corner to balance wear without remounting. A 25mm hub-centric spacer is used at the front to bring the +50 wheel to the correct position. This is the most cost-effective track setup for GT350 owners who put serious mileage on their tires.

Yes — a 25mm hub-centric spacer is required at the front when running +50 offset wheels at all four corners. The spacer must be hub-centric to 70.6mm. Standard bolt-on adapters are not a substitute. The rear runs the +50 wheel with no modification required.

Properly sized aftermarket wheels do, but not all fitments do. The GT350 runs a six-piston Brembo front caliper that creates a clearance challenge for many wheel designs. Every Project 6GR R-spec fitment — 19x11 +24 front and 19x11.5 +56 rear — has been verified to clear the factory caliper with zero modification.

The GT350 and GT350R run a 5x114.3 bolt pattern with a 70.6mm hub bore. All Project 6GR R-spec wheels are machined to 70.6mm hub-centric — no centering rings required.

Yes. Project 6GR offers 20" fitments in R-spec sizing — 20x11 +24 front and 20x11.5 +56 rear — with tire options ranging from 295/30/20 to 315/30/20. The GT350 community predominantly stays with 19" to preserve the car's handling balance and factory suspension geometry, but 20" is fully compatible and runs cleanly on street builds.

The GT350R's factory carbon fiber wheels use a wheel pad that results in extended front studs. When switching to aftermarket wheels, those extended studs require open-ended lug nuts rather than standard closed-end hardware. This is a straightforward swap, but it is something to account for before mounting. Rear studs are standard length.

The OEM GT350R carbon fiber wheels are approximately 18 lbs each — lighter than any aluminum forged wheel at equivalent sizing. P6GR's TEN in R-spec comes in at 24.20 lbs front and 23.35 lbs rear, which is heavier than carbon fiber but lighter than most aluminum alternatives. The advantages P6GR offers over OEM CF replacements are finish options, full TPMS compatibility without proprietary adapters, structural warranty coverage, and far lower replacement cost when a wheel is damaged.

The most common street combination is 305/30/19 front and 315/30/19 rear in the staggered setup, which gives a 10mm wider rear contact patch. Some owners run 325/30/19 at the rear for additional grip. The square track setup typically runs 305/30/19 or 315/30/19 all around — the square footprint is more important than the specific width for rotation purposes.