911rox

For those guys running 9" front track wheels on their narrow body GT3s, just wondering if you get any rubbing at the fenders or against the springs? Basically will a 9" wheel (non RS) fit In the front end of a gt3... My understanding is that some of the guys on 18s do the wider wheels...

Also, can the clearance between wheel and spring be increased on the 997.2? Rotating struts etc?

What are your experiences?


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I have renamed the thread to bring to fellow members attention another consideration when ordering non standard after market wheels on Series 2 cars

kyrocks

9" wheel will fit on the front of a GT3 (Non RS) without difficulty. I believe OEM is 8.5" (997.2) I know 235/35/19 and 245/35/19 will easily fit without rubbing. I haven't tried 18" rims or wider tires. You could definitely go larger depending on how much camber you have as well.

mdrums

I see GT3 with 9x18 at the track all the time. They are either using 245/40/18 or 255/35/18 for the front.

Polarporsche

I'm running Forgeline Centre Lock 9x18" front wheels & 12x18" rear wheels on my 2011 GT3.
I have Hoosier R6's in the following sizes Front: 245/35/18 Rear: 315/30/18.
No issues with rubbing, even at full lock.

911rox

My wheels are 19x9s.... Just got them back from the milling shop today and getting sensors and tyres fitted tomorrow morning. Using the MPSCs that i pulled off the car at 4000km to start with- 235s up front and 305s in the rear...

Just a little nervous because the distance between the OEM wheels and springs seems tight to me and with the new wheels there is another 1/4" to accomodate...

If needed, is it possible to increase distance between wheel and spring?

LehmanZ06

I was thinking the same thing. But the offset for the 9" wheels is greater. Stock 19" regular GT3 is 53mm and RS is like 47mm. So by being further out 1/4" you can put a 9" wheels in the same space.

1/4 inch on each side....=1/2 inch bigger wheel.....or so i think

911rox

My wheels aren't the RS offsets Lehmann as the would likely rub fenders with the whole 12mm added to the outer side. They are supposedly an offset similar to what is on the car so that it spreads the width out over both sides...

We will know in about 4 hours wen i get out of work but when I had test fitted a rim when first i got them, it was close but cleared okay- forgot to spin the steering wheel to check on full lock...

Will post pics IF all goes well this arvo...

Gus F

All last year I'd been tracking my 2008 997 narrow body GT3 with BBS E88's 9" fronts and 12" rears x 18", Offsets Front 51mm, Rear 63mm. tire size F 255/35-18, Rear 325/30-18. Camber:-1.8 deg. No rubbing, or maybe minimum rubbing (on the inside this is solve rotating the spring), this the maximum size that can fitted. I imagine it should be no problem with the 997.2 RS.
You got to have the right offsets.

911rox

Regretfully no photos... I ran into offset issues up front with the supplier's recommended offset but they are being good about the situation considering their recommendation didn't work and replacing the wheels...

I now have recommendations for any others wanting a 9" front wheel on their narrow body GT3.2... This is observational and should be discussed with your wheel supplier before you pull the trigger! I am a pharmacist with a clue, NOT a wheel manufacturer....

Realistically, an offset of higher than 51mm (Gus was spot on) will NOT give sufficient clearance on the inside. A 51mm offset would technically only be moving the tyre tread outward about 2mm which should avoid fender rub!!! Such an offset is good for cambers from factory to low-mid 2ish I'd say... Guys wanting track setups with high camber would really need to discuss offsets in the 47-49 range with their supplier because if you haven't allowed enough room on the inside, they can't lean!!! Please remember though that these lower offsets would have no chance of working with street alignments without lots of fender rub...

Remember, with 5 stud set ups you could use spacers and longer lugs to increase the space to the springs for higher cambers... With centrelocks, there aren't any longer centrelock bolts so spacers are not an option. If you haven't made an allowance with correct offset, you can kiss higher cambers goodbye with 9" wheels as you'll end up hard up against the springs.

For the record, mine had an offset of 55mm and they ended up hard up against the springs with factory alignment settings... No good...

Do your homework fellas!!!! The centrelocks make the 997.2 cars a whole new animal and so much of what we know from the 997.1 goes out the window where offset and camber are involved... Its become evident to me now that many of the wheel manufacturers haven't worked this out yet...

911rox

ps. its not a coincidence that the offset of the 9" wheels on the 3.2RSs is 47mm... its because as well as increasing the track, it puts the inner edge of the wheels the same distance away from the struts/springs as the GT3s allowing full adjustment to camber within design parameters...

911rox

Bump... guys- just one last reminder for any of you hoping to go non OEM sizes and offsets on your narrow body GT3. Make sure your wheel dude gets his offsets right so you're not waiting months to be disappointed. Hope to post some pics of the new wheels very soon- 19x8.5" this time as originally ordered. Wheel manufacturer has been very proactive since the error and are going to try and make it happen by month's end...

mdrums

If you get the offset correct you can use and should be using 9" wide wheels. I would not do the 8.5" wide wheels. It is always better to slightly stretch the side wall than to have the wheel narrower.

utkinpol

I have 997.1 C2 car - it has same front dimensions as NB GT3 car, I run 9" 18" CCW rims in +50mm 7" backspace, 265/35r18 rubber right now but will change to r888 in 255/35. i have rotated upper mounts to make wheel go deeper into wheel well, with stock settings it was exactly in line with fenders and as it was diving in with -3 deg camber still it was protruding a bit. rotated upper mounts made it be perfectly inside.
265 rubber is imho a max possible fit, I wonder if anybody was ever able to fit 275 rubber in front - I have 335 RA1 tires set but not sure if 275 RA1s will fit in front and do not want to run 335s with 245s in front.

picture below is how it looked with stock upper mounts an -2.3 deg of camber.

911rox

Agreed mdrums. When they made the 9s by accident, this is why i accepted them but i couldn't finf info on correct offsets. It has now become evident that they don't have offsets sorted for mkii cars and considering I'm half way around the world, the oem sizing will let me do hoosiers or r-comp 4 track and reg tyres for street without further fitment dilemmas. If my wheel maker was local, i'd take the car to them to get 9s sorted.

Thus, wanted to put others in the ballpark of offsets they should be looking at....

911rox

50mm offsets is in the vicinity of where I found they need to be to work on NB cars... Before this experience, i didn't have a clue as there was no info on the forum and took the manufacturer's word for what the correct offset should be.