Forgeline GS1R 991 GT3 RS 20"/21"

from 7,850.00

Originally designed for professional racing teams competing in the IMSA Continental Tire Sportscar Challenge Grand Sport (GS) class, the Forgeline GS1R combines the latest in advanced wheel technology, including one-piece forged monobloc construction, motorsport engineered design, and I-beamed spokes. This wheel is engineered to withstand the rigors of top-level endurance racing with a 2100 lb. street tire load rating and exceptional deflection stiffness.


Though made from the same forgings and similar design as the original GA1R street wheel, the GS1R employs an open-lug center area for additional weight reduction and improved access to the lugs. In combination with a new chamfered outer lip (with fewer sharp edges for easier handling), this enables faster wheel changes and, depending on size and offset, can save an additional pound of mass from each wheel!

 The GS1R is machined from a single forging of 6061-T6 aluminum. It is currently available in 19, 20, and 21-inch diameters with a range of widths and offsets. And just like any Forgeline wheel, the GS1R is available with fully customizable finish options 

  • One-Piece Monoblock Design

  • Concave Profile

  • I-Beamed Spoke Technology

  • Extreme Stiffness

  • Extreme Fatigue Strength

  • 2100 lb. Street-Tire Load Rating (per wheel)

  • Lightweight – Up to One Pound Lighter Than the Standard GA1R

  • Generous Brake Clearance

  • Forged 6061-T6 Aluminum

  • Open Lug center will NOT accept a center cap. Recommended for track use only.

  • Customizable Finish Options

  • Designed specifically for Porsche Center Lock Applications

991 GT3 RS Application

  • 20×9.5

  • 21×12.5

Michelin Pilot Sport Cup 2 (OEM)
325/30ZR21 (108Y) XL
265/35ZR20 (99Y) XL

Michelin Pilot Sport Cup 2R (Aggressive Track)
265/35ZR20 (99Y) XL
325/30ZR21 (108Y) XL

  • frg.991.601.0001

  • frg.991.601.0001.PS2

  • frg.991.601.0001.C2R

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