19" Forgeline GA1R for GT4 from Competition Motorsport.com
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Thread: 19" Forgeline GA1R for GT4 from Competition Motorsport.com

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    19" Forgeline GA1R for GT4 from Competition Motorsport.com

    The 19" Forgeline GA1R wheel sets have been very popular lately for owners hitting the track with their GT4's.
    Optimal wheel sizes are 9x19" front and 11x19" rear with 265/35/19 Hoosier R7 to help dial out the factory setting understeer and either 295/30/19 or 295/35/19 Hoosier R7 rears.

    We have put together a special package deal for P9 members looking for the best track wheel/tire setup available that includes;
    Forgeline GA1R open lug 9x19" and 11x19" in standard finish (optional finishes also available at higher cost)
    Hoosier 265/35/19 R7 and either 295/30/19 or 295/35/19 Hoosier R7
    Beru TPMS
    Mount and balance
    Shipping to your door for a ready to mount track solution.

    PM for the special P9 package price.
    Attached Thumbnails Attached Thumbnails 19" Forgeline GA1R for GT4 from Competition Motorsport.com-ga1r_graphite-jpg   19" Forgeline GA1R for GT4 from Competition Motorsport.com-ga1r_gloss-black-jpg   19" Forgeline GA1R for GT4 from Competition Motorsport.com-ga1r_titanium-jpg  

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    Re: 19" Forgeline GA1R for GT4 from Competition Motorsport.com

    PM Sent, thanks!
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    Re: 19" Forgeline GA1R for GT4 from Competition Motorsport.com

    Subscribed. My car is June... Why do other wheel vendors say they can't do a 19"x11" because the rear suspension knuckle (toe-link?) is too close to the wheel, so they can only do 10.5"

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    Re: 19" Forgeline GA1R for GT4 from Competition Motorsport.com

    I recently put 19x11 rims on my 14 Cayman S. I'll admit that I didn't even look at this clearance at the time. Recently, a fellow P-9er, 38Cayman, emailed me asking me to check and indeed it is very, very close on the regular suspension, maybe 4mm clearance. So on the standard car, the thickness of the rim lip determines if the rim will fit. If Porsche moved the GT4 toe link in any closer, it will take a special rim to fit. 20x11 inches work, obviously.

    Photo of 19x11 inch rim to toe link clearance on standard 981 suspension (not GT4):
    19" Forgeline GA1R for GT4 from Competition Motorsport.com-11_toe_link-jpg
    Last edited by Voyager6; 12-15-2015 at 04:46 PM. Reason: add photo

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    Re: 19" Forgeline GA1R for GT4 from Competition Motorsport.com

    Quote Originally Posted by CMS View Post
    The 19" Forgeline GA1R wheel sets have been very popular lately for owners hitting the track with their GT4's.
    Optimal wheel sizes are 9x19" front and 11x19" rear with 265/35/19 Hoosier R7 to help dial out the factory setting understeer and either 295/30/19 or 295/35/19 Hoosier R7 rears.

    We have put together a special package deal for P9 members looking for the best track wheel/tire setup available that includes;
    Forgeline GA1R open lug 9x19" and 11x19" in standard finish (optional finishes also available at higher cost)
    Hoosier 265/35/19 R7 and either 295/30/19 or 295/35/19 Hoosier R7
    Beru TPMS
    Mount and balance
    Shipping to your door for a ready to mount track solution.

    PM for the special P9 package price.
    Can you get the black wheels with a yellow stripe? Does the black have to be gloss or can it be satin? You might want to fill in some info about these wheels in our GT4 Track Tuning WIKI that I just put up as I'm sure other members would find it helpful! TIA!
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    Re: 19" Forgeline GA1R for GT4 from Competition Motorsport.com

    Foregline offers an extensive list of standard colors (black, silver, gold, gunmetal, graphite, titanium, red, yellow, etc) in gloss, satin, and matte finishes. You can definitely get them in black with a yellow stripe. We just completed a set in black with a red stripe. The stripe requires incremental finish time so there is a $75/wheel uncharge for it.

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    Re: 19" Forgeline GA1R for GT4 from Competition Motorsport.com

    Quote Originally Posted by JoeWeinstein View Post
    Subscribed. My car is June... Why do other wheel vendors say they can't do a 19"x11" because the rear suspension knuckle (toe-link?) is too close to the wheel, so they can only do 10.5"
    Hard to say Joe. Perhaps their standard offsets don't work and they sell a limited selection of wheels, vs Forgeline who custom manufacturers each set to the customer specs.

    Quote Originally Posted by Voyager6 View Post
    I recently put 19x11 rims on my 14 Cayman S. I'll admit that I didn't even look at this clearance at the time. Recently, a fellow P-9er, 38Cayman, emailed me asking me to check and indeed it is very, very close on the regular suspension, maybe 4mm clearance. So on the standard car, the thickness of the rim lip determines if the rim will fit. If Porsche moved the GT4 toe link in any closer, it will take a special rim to fit. 20x11 inches work, obviously.

    Photo of 19x11 inch rim to toe link clearance on standard 981 suspension (not GT4):
    19" Forgeline GA1R for GT4 from Competition Motorsport.com-11_toe_link-jpg
    There remains 3mm of clearance with the 19" forgeline GA1R's.

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    Re: 19" Forgeline GA1R for GT4 from Competition Motorsport.com

    Quote Originally Posted by CMS View Post
    There remains 3mm of clearance with the 19" forgeline GA1R's.
    Good to know. My worry is that as the suspension bushings age, that link might just hit the rims. I will have to watch this carefully on my car as the bushings age.

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    Re: 19" Forgeline GA1R for GT4 from Competition Motorsport.com

    Quote Originally Posted by Voyager6 View Post
    Good to know. My worry is that as the suspension bushings age, that link might just hit the rims. I will have to watch this carefully on my car as the bushings age.
    Yep, although there aren't the typical soft rubber bushings on the GT4... 3mm ain't much.
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    Re: 19" Forgeline GA1R for GT4 from Competition Motorsport.com

    The 19" Forgeline GA1R open lug wheels have been a extremely popular setup for the GT4. CompetitionMotorsport has several sets in production with Forgeline and we have them available in Satin pearl Gray, Satin Black and Satin Gold (color samples attached). Let us know if you have questions, or if you're ready for a new set of Forgeline Wheels.
    Attached Thumbnails Attached Thumbnails 19" Forgeline GA1R for GT4 from Competition Motorsport.com-satin-gold-jpg   19" Forgeline GA1R for GT4 from Competition Motorsport.com-satin-black-jpg  
    Attached Images Attached Images 19" Forgeline GA1R for GT4 from Competition Motorsport.com-pearl-gray-jpg 

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    Re: 19" Forgeline GA1R for GT4 from Competition Motorsport.com

    Thank you for the orders guys. We have 1 remaining set of the 19" GA1R in the GT4 setup available yet. Still time to pick your finish. Currently there is a 6 week wait time for a new set of 1-piece wheels from Forgeline. These will be ready to ship in only 3 weeks. Btwy we are now building more sets with the 10.5" wide rear compared to the 11.0" (still fits a 295 nicely) to allow for extra margin of safety for clearing the rear LCA. Let us know how we can help.

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    Re: 19" Forgeline GA1R for GT4 from Competition Motorsport.com

    We have ordered another pallet of the 19" GS1R in GT4 fitment for early July production. We have 2 GT4 sets left on the latest order and there is still time to spec your desired finish.

    Contact us today for a great package deal on wheels and tires.

    The GS1R's look just like the GA1R but have been lightened further with additional milling which saves about another pound per wheel while maintaining the same load rating (2100lbs per wheel on street tires) of the GA1R.

    The GS1R are the same wheels used successfully by many top TUDOR/IMSA race series teams.

    Designed for professional racing teams competing in the United Sportscar CTSCC Grand Sport (GS) class, the Forgeline GS1R combines the latest in advanced wheel technology, including one piece forged monoblock 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 our GA1R street wheel, the GS1R has even more material machined from the 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!
    Attached Thumbnails Attached Thumbnails 19" Forgeline GA1R for GT4 from Competition Motorsport.com-forgeline-gs1r-translucent-red-jpg   19" Forgeline GA1R for GT4 from Competition Motorsport.com-forgeline-gs1r-silver-jpg  

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    Re: 19" Forgeline GA1R for GT4 from Competition Motorsport.com

    Quote Originally Posted by CMS View Post
    Though made from the same forgings and similar design as our GA1R street wheel, the GS1R has even more material machined from the 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!
    Is there a reason why these cannot be used on the street? I imagine there isn't since they are made of the same material.
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    Re: 19" Forgeline GA1R for GT4 from Competition Motorsport.com

    No problems with street use.

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    Re: 19" Forgeline GA1R for GT4 from Competition Motorsport.com

    Quote Originally Posted by CMS View Post
    The 19" Forgeline GA1R wheel sets have been very popular lately for owners hitting the track with their GT4's.
    Optimal wheel sizes are 9x19" front and 11x19" rear with 265/35/19 Hoosier R7 to help dial out the factory setting understeer and either 295/30/19 or 295/35/19 Hoosier R7 rears.

    We have put together a special package deal for P9 members looking for the best track wheel/tire setup available that includes;
    Forgeline GA1R open lug 9x19" and 11x19" in standard finish (optional finishes also available at higher cost)
    Hoosier 265/35/19 R7 and either 295/30/19 or 295/35/19 Hoosier R7
    Beru TPMS
    Mount and balance
    Shipping to your door for a ready to mount track solution.

    PM for the special P9 package price.
    P9 PRICE PLEASE, very interested Thanks

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    Re: 19" Forgeline GA1R for GT4 from Competition Motorsport.com

    Big thanks to Brian at Competition Motorsport. Can't wait to try these out on track.


    Quick pics of GS1R with RE71R tires.





    There's about 1/2" (closest to the hub)- 3/4" (farthest away from the hub) clearance between the caliper face and back of the spokes. A lot more clearance than OE wheels.













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    Re: 19" Forgeline GA1R for GT4 from Competition Motorsport.com

    edwin814 nice looking wheels! How much clearance is there between the caliper and the inner barrel of the wheel? Some 19" wheels only have a couple millimeters.
    Current cars: 2016 GT4 / 2014 Cayman S / 2015 Corvette Z51 / 2007 Subaru Forester turbo

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    Re: 19" Forgeline GA1R for GT4 from Competition Motorsport.com

    Quote Originally Posted by never enuf View Post
    edwin814 nice looking wheels! How much clearance is there between the caliper and the inner barrel of the wheel? Some 19" wheels only have a couple millimeters.
    There's about 1" clearance between the caliper and the inner barrel
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    Re: 19" Forgeline GA1R for GT4 from Competition Motorsport.com

    If you have PCCBs the tolerance can be a bit tight.

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    Re: 19" Forgeline GA1R for GT4 from Competition Motorsport.com

    A bit off-topic, but...

    What kind of stud kits are best for Caymans and GT4's?

    Thx, John

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