Aftermarket wheel options for 991 GT3
#62
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Our GT1, GA1R, CF1, SE1, and SE1 would all work, with the GA1R and GT1's being the lightest.
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Forgeline Motorsports
3522 Kettering Blvd.
Dayton, Ohio 45439
http://www.forgeline.com
David Schardt
President
Forgeline Motorsports
3522 Kettering Blvd.
Dayton, Ohio 45439
http://www.forgeline.com
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#64
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There is a lot of content here to browse !
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Porsche | Audi | Ferrari | Lamborghini | McLaren
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Last edited by gmgracing; 06-16-2015 at 06:51 PM.
#65
In the FWIW category, initial test fit & run-in of Forgeline's 19" PCCB rim with a set of Michelin Cup2's fitted.
Initial Test fit of Forgeline 19" wheel over 991 GT3 with PCCB - rear tire, 325/30 x19 vs OEM 305/35 x20, weight savings over OEM @9lbs rear
Temporarily misplaced notes on Tires+Rims rough weight delta for:
Front 235/40 x19 vs OEM 245/35 x20 &
The rear 325/30 x19 vs 305/30 x20.
IIRC, the total tire, Cup2's, plus rims, 19" vs. 20", differences were @ 10-11 lbs less per front, & @ 9 lbs less per rear, notwithstanding the +40mm rear tread width gain in going from a 305mm to a 325mm rear section width. Can't tell yet what effect, if any the loss of 20mm, -10mm per side, in the front has, or what adding section width to the rear while decreasing it in the front has on handling.
Last, FWIW, this is a VERY tight fit in the front over the 410mm rotors, and while it would seem an "easier" solution vis-à-vis the rear, smaller diameter rotors, the install guidelines failed to mention that the rear brake line bracket/holder, at least on my car, made contact with the inside 19' barrel and had to be "massaged" (bent a bit I gather) out of the way. I'd guess Forgeline ought to be able to release final "as made/manufactured" official rim weights now for the wheels by themselves - they are lighter by quite a bit over the OEM rims. As for relative strengths, . . . . . . I'm going on Forgeline's reputation for making a great rim.
Cheers, mlp
Initial Test fit of Forgeline 19" wheel over 991 GT3 with PCCB - rear tire, 325/30 x19 vs OEM 305/35 x20, weight savings over OEM @9lbs rear
Temporarily misplaced notes on Tires+Rims rough weight delta for:
Front 235/40 x19 vs OEM 245/35 x20 &
The rear 325/30 x19 vs 305/30 x20.
IIRC, the total tire, Cup2's, plus rims, 19" vs. 20", differences were @ 10-11 lbs less per front, & @ 9 lbs less per rear, notwithstanding the +40mm rear tread width gain in going from a 305mm to a 325mm rear section width. Can't tell yet what effect, if any the loss of 20mm, -10mm per side, in the front has, or what adding section width to the rear while decreasing it in the front has on handling.
Last, FWIW, this is a VERY tight fit in the front over the 410mm rotors, and while it would seem an "easier" solution vis-à-vis the rear, smaller diameter rotors, the install guidelines failed to mention that the rear brake line bracket/holder, at least on my car, made contact with the inside 19' barrel and had to be "massaged" (bent a bit I gather) out of the way. I'd guess Forgeline ought to be able to release final "as made/manufactured" official rim weights now for the wheels by themselves - they are lighter by quite a bit over the OEM rims. As for relative strengths, . . . . . . I'm going on Forgeline's reputation for making a great rim.
Cheers, mlp
#67
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BBS FI-R in the extremely limited black finish from BBS
For any questions or possible inquiries please contact, Dom@gmgracing.com
For any questions or possible inquiries please contact, Dom@gmgracing.com
Last edited by gmgracing; 07-29-2015 at 05:32 PM.
#69
Is anyone running 325/30x20 tires on their OEM rims? After some experimentation with 19" front and rear, I think I'm going to try out a "reversed" stagered setup - keep the GT3 OEM 20" front with 245/35x20 and use a 19" rear 325/30x19.
FWIW, the calculated tire size/diameter options off the Miata Tire Calculator vis-a-vis the GT3RS OEM 265/35x20 Fronts & 325/30x21 rear fitment:
- 991GT3-RS OEM 265/35-20 & 325/30-21 F/R vs. the 991GT3's 245/35x20 & 305/30x20;
o 265/35-20 27.3" & 739 vs. GT3 245/35-20 @ 26.8" 754
o 325/30-21 28.7" & 703 vs. GT3 305/30-20 @ 27.2" 741
- Specification Diameter Circumference Revs/Mile Difference
- 245/35-20 GT3 Front 26.8in 84.0in 754 0.0%
- 265/35-20 GT3RS F 27.3in 85.8in 739 2.1%
- 305/30-20 GT3 Rear 27.2in 85.5in 741 1.7%
- 325/30-20 . . . . . . . 27.7in 87.0in 729 3.5%
- 325/30-19 . . . . . . . 26.7in 83.8in 756 -0.3%
- 325/30-21 GT3RS R . .28.7in 90.1in 703 7.2%
FWIW, the calculated tire size/diameter options off the Miata Tire Calculator vis-a-vis the GT3RS OEM 265/35x20 Fronts & 325/30x21 rear fitment:
- 991GT3-RS OEM 265/35-20 & 325/30-21 F/R vs. the 991GT3's 245/35x20 & 305/30x20;
o 265/35-20 27.3" & 739 vs. GT3 245/35-20 @ 26.8" 754
o 325/30-21 28.7" & 703 vs. GT3 305/30-20 @ 27.2" 741
- Specification Diameter Circumference Revs/Mile Difference
- 245/35-20 GT3 Front 26.8in 84.0in 754 0.0%
- 265/35-20 GT3RS F 27.3in 85.8in 739 2.1%
- 305/30-20 GT3 Rear 27.2in 85.5in 741 1.7%
- 325/30-20 . . . . . . . 27.7in 87.0in 729 3.5%
- 325/30-19 . . . . . . . 26.7in 83.8in 756 -0.3%
- 325/30-21 GT3RS R . .28.7in 90.1in 703 7.2%
#71
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Aftermarket wheel options for 991 GT3
I had ForgeLine GT1s on my 10 GT3. Perfect fit and a lot of compliments on the look. I'll most go with a set on the 15.