turbo3six

991 Turbo
245/35 ZR 20 8.5J
305/30 ZR 20 11J

991 GT3
245/35 ZR 20 9J
305/30 ZR 20 12J

I have not been able to find the offsets for the OEM wheels to determine if 991 GT3 CL wheels will fit properly to a 991 Turbo?

I suspect not or I would have seen it done... who has the tech specs or can say for certain?

Thanks

worf928

I got offset info from the configurator last year when I researched before buying my 991TT.

Can't help with GT3, but here are two wheel sizes for the TT/TTS:

1-piece alloy wheels with 5-spoke Sport Classic design
9 x 20 ET 51 with 245/40 ZR 20 tires (front)
11.5 x 20 ET 56 with 305/35 ZR 20 tires (rear)

Alloy wheels with 10 double-spoke two-tone design
8.5 x 20 ET 51 with 245/35 ZR 20 tires (front)
11 x 20 ET 59 with 305/30 ZR 20 tires (rear)

worf928

From the configurator:

991 GT3RS
Tires (front)
9.5 J x 20 RO 50 with265/35 ZR 20 sports tires
Tires (rear)
12.5 J x 21 RO 48 with325/30 ZR 21 sports tires

If the GT3 has wheel wells as zaftig as the RS then I would very-much doubt GT3 wheels will fit a Turbo. But, doesn't the RS come with extra-plump corners? I dunno, but I bet the GT3/RS forum does.

turbo3six

Interested in the GT3 CL (center lock) fitment. Sport Classic and 10 Double spoke are not CL ...both are 5 bolt fitments. The GT3 RS is a CL design but 21" rears clearly appear too large for fitment to a 991TT. Thanks.

fugeo

Turbo S specs
9x20 ET51 245/35ZR20
11.5x20 ET56 305/30ZR20

GT3 specs
9x20 ET55 245/35zr 20
12x20 ET47 305/30zr20

The rears will protrude by 9mm which is OK because there are AM wheels that are more aggressive. The fronts however will not be so nice, they retract into the fender by 4mm.

Randyc151

My Porsche dealer...who I attempted to buy GT3 wheels from...said that the front would not fit. If there was a way, they would have done it. I think the front are the problem, due to the offset diff between AWD and RWD.

francisluu

What about a GT3 RS front wheel matched with the GT3 rear? Will the RS front protrude out too much?

GT3 RS front: 9.5" x 20", ET50

sterlingc1975

I have done it on 2 turbos no problems...

francisluu

YES! Also, GT3 front bumper conversion?! Is it just plug and play (aside from, say, the adaptive cruise control and parking sensors)?

sterlingc1975

no a lot more involved then that ..

dhirm5

That looks fantastic.

nrgy

Could you go into more detail about the GT3 bumper conversion on the 991 Turbo? From what I understand the GT3 is narrower, but the GT3RS and Turbo are same width but not front fender width. But it looks like the GT3RS simply adds plastic flares to the ends of a GT3 bumper to match up with the wider GT3RS fenders. My heads spinning.

I'm assuming the GT3RS fenders > Turbo > GT3? Regardless the GT3 nose looks right at home on the Turbo and any 911 really.

Oerding911

I'm running bbs fi-r in gt3 offset, going to be switching to the 9.5 but the question is... will i be able to run a 265 up front or is that pushing it? sitting on techart springs.

speed21

Looks hot! Please share how to do.

991turbo

Looks nice and aggressive !