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GTS vs GT3 wheel (and axle sizes), Centerlock questions, etc. Wheel experts needed!
Ive been looking to lower my GTS but I am afraid the wheel offset isn't aggressive enough to fill the wheel well out without switching wheels. The wheels are just tucked in too much and I cannot stand tucked in wheels. I was looking at a 991.2 GT3 the other day and the wheel offsets looked much more aggressive and flush to the fender. I confirmed that while we run the same tire size, the GT3 does in fact have a more aggressive offset (assuming the same axle width). I cannot remember where Ive read this, but from memory they seem to vary slightly from model to model based on the engine.
Can anyone confirm the axle width on the GTS vs GT3? Im trying to determine if I could use GT3 offsets if I went for an aggressive aftermarket wheel setup.
GTS rear track 60.8"
GT3 rear track 61.2"
Also, would a GT3 wheel fit on the CL system on a GTS? I would think they would but I don't know if they are they identical systems?
I am no expect on CL systems, the GTS is the first car Ive owned with one. Can anyone explain to me exactly why you can use a spacer system on a CL wheel? I am assuming there is a finite amount of space available and increasing the thickness of the wheel with a spacer will not allow the locking nut to seat properly.
I believe that spacers cannot be used with CL equipped cars, but you can install control arms (Elephant Racing) on the front to help achieve the look you’re after. The rears will be very similar given the much wider gt3 wheel.
You need to really spec some after market wheels for GTS...the GT3 wheels are not ideal...offsets not ideal to give you the look you want. Carrera based cars have different uprights than the GT cars thus the brake calipers and wheels are different geometry. Also due to,the way a centerlock works spacers 100% absolutely do not work...no one makes a spacer anyway for center lock...it’s impossible to make work.
Ive been looking to lower my GTS but I am afraid the wheel offset isn't aggressive enough to fill the wheel well out without switching wheels. The wheels are just tucked in too much and I cannot stand tucked in wheels. I was looking at a 991.2 GT3 the other day and the wheel offsets looked much more aggressive and flush to the fender. I confirmed that while we run the same tire size, the GT3 does in fact have a more aggressive offset (assuming the same axle width). I cannot remember where Ive read this, but from memory they seem to vary slightly from model to model based on the engine.
Can anyone confirm the axle width on the GTS vs GT3? Im trying to determine if I could use GT3 offsets if I went for an aggressive aftermarket wheel setup.
GTS rear track 60.8"
GT3 rear track 61.2"
Also, would a GT3 wheel fit on the CL system on a GTS? I would think they would but I don't know if they are they identical systems?
I am no expect on CL systems, the GTS is the first car Ive owned with one. Can anyone explain to me exactly why you can use a spacer system on a CL wheel? I am assuming there is a finite amount of space available and increasing the thickness of the wheel with a spacer will not allow the locking nut to seat properly.
I believe that spacers cannot be used with CL equipped cars, but you can install control arms (Elephant Racing) on the front to hell achieve the look you’re after. The rears will be very similar given the much wider gt3 wheel.
The wheels on the 991.2 GTS are 12 inches which is exactly the same as the GT3.
Elephant racing sell the adjustable control arms which can extend your track beyond a GT3.
991.2 Turbo wheels are ET51 and ET56, those would space the rear out a bit. Honestly if you want them right on the lip, talk to one of the aftermarket wheel vendors who have figured it out. The other point is that GT3 run Michelin Sport Cup 2 or Dunlop Sport maxx both of which run really wide which also influences the look.
Ive been looking to lower my GTS but I am afraid the wheel offset isn't aggressive enough to fill the wheel well out without switching wheels. The wheels are just tucked in too much and I cannot stand tucked in wheels. I was looking at a 991.2 GT3 the other day and the wheel offsets looked much more aggressive and flush to the fender. I confirmed that while we run the same tire size, the GT3 does in fact have a more aggressive offset (assuming the same axle width). I cannot remember where Ive read this, but from memory they seem to vary slightly from model to model based on the engine.
Can anyone confirm the axle width on the GTS vs GT3? Im trying to determine if I could use GT3 offsets if I went for an aggressive aftermarket wheel setup.
GTS rear track 60.8"
GT3 rear track 61.2"
Also, would a GT3 wheel fit on the CL system on a GTS? I would think they would but I don't know if they are they identical systems?
I am no expect on CL systems, the GTS is the first car Ive owned with one. Can anyone explain to me exactly why you can use a spacer system on a CL wheel? I am assuming there is a finite amount of space available and increasing the thickness of the wheel with a spacer will not allow the locking nut to seat properly.
Good timing as I have been dealing with this same issue so hopefully I can shed some insight. I have a '17 C4 GTS with the 20x9 and 20x12 center lock wheels and wanted to fill the fenders better. I don't plan on lowering the car. I purchased some HRE P101's with ET40 up front and ET45 in the rear and was told by the retailer that these would be fender flush, as requested. The fronts are pretty much bang-on with about 2mm between the outside of the rim and fender edge, but with the lip protector on the stock P-Zeros, it looks pretty much flush. Unfortunately, the rears are a different story. The outside of the rim sticks out around ~8mm past the outside of the fender (further amplified by tire lip protector - see pic). With no help from the retailer I decided to contact HRE directly to find out what was going on. Turns out these wheels are designed for lowered GTSs and for non-lowered cars they use a 20x11.5 wheel with the same offset. This makes sense as the 0.5" rim width difference makes up for that ~8mm (0.5" / 2 x 25.4mm = 6.4mm). I was also told that they have done the 20x12 ET45 on many lowered GTSs with no issues as the wheel will tuck up and in to accommodate that ~8mm. Since I have a GT3 incoming this month, I asked what their standard fitment for this car is and it is the same ET40 up front. Since the GT3 stock fronts have only a 4mm offset difference from the GTS (ET55 vs ET51), these will be spot on. The HRE rears are 2mm more aggressive (ET45 vs stock ET47), so that really won't be any different.
So based on all this, putting GT3 offset wheels on a lowered GTS (assuming to roughly GT3 height), the rears will be pretty flush, but the fronts will not come close.
Important to note: If ordering aftermarket, make sure they know whether or not the car is lowered. Hope this helps.
Good timing as I have been dealing with this same issue so hopefully I can shed some insight. I have a '17 C4 GTS with the 20x9 and 20x12 center lock wheels and wanted to fill the fenders better. I don't plan on lowering the car. I purchased some HRE P101's with ET40 up front and ET45 in the rear and was told by the retailer that these would be fender flush, as requested. The fronts are pretty much bang-on with about 2mm between the outside of the rim and fender edge, but with the lip protector on the stock P-Zeros, it looks pretty much flush. Unfortunately, the rears are a different story. The outside of the rim sticks out around ~8mm past the outside of the fender (further amplified by tire lip protector - see pic). With no help from the retailer I decided to contact HRE directly to find out what was going on. Turns out these wheels are designed for lowered GTSs and for non-lowered cars they use a 20x11.5 wheel with the same offset. This makes sense as the 0.5" rim width difference makes up for that ~8mm (0.5" / 2 x 25.4mm = 6.4mm). I was also told that they have done the 20x12 ET45 on many lowered GTSs with no issues as the wheel will tuck up and in to accommodate that ~8mm. Since I have a GT3 incoming this month, I asked what their standard fitment for this car is and it is the same ET40 up front. Since the GT3 stock fronts have only a 4mm offset difference from the GTS (ET55 vs ET51), these will be spot on. The HRE rears are 2mm more aggressive (ET45 vs stock ET47), so that really won't be any different.
So based on all this, putting GT3 offset wheels on a lowered GTS (assuming to roughly GT3 height), the rears will be pretty flush, but the fronts will not come close.
Important to note: If ordering aftermarket, make sure they know whether or not the car is lowered. Hope this helps.
Thanks for the info. I am assuming the C4 GTS's have a slightly different fitment though.
Changing the wheel in a GTS with centerlocks is not so easy.
I have studied in the last days the benefits of lightweight wheels for a sports car and are significant ones. Especially iF a lightweight wheel will be used I can save more than 10kgs total rotation mass.
The problem is that most of the centerlocks lightweight aftermarket wheels targeting GT and Turbo cars which have different offsets that GTS.
Not sure how RAS will behave if rear offset seriously changed from 63 to 45. This is almost 18mm difference per side total 36 mm in the rear axle.
To the OP have you concluded to the offset option for your 991.2 GTS?
I think there are a lot of us with GTS's in the same boat. for $10,000 a set, no one wants to take a chance and order the wrong offset and be stuck with wheels that no one can use.
If someone can get the answers with proper offsets for GTS cars I think it should be a "Sticky" at the top of the 991 page as this is something that needs to be documented.
I have no idea what offsets I need on a NON lowered car or if changing the offsets will cause problems with handling, steering, or RAS
Here is a thread I posted last week after installing GT3 wheels on my ‘19 Carrera GTS Coupe with PDCC, SPASM, and RAS. No poke. Plenty of clearance front and rear, lock to lock, no rub. The GTS, especially with SPASM and RAS has a pretty flexible offset range vs the narrow body cars.
Here is a thread I posted last week after installing GT3 wheels on my ‘19 Carrera GTS Coupe with PDCC, SPASM, and RAS. No poke. Plenty of clearance front and rear, lock to lock, no rub. The GTS, especially with SPASM and RAS has a pretty flexible offset range vs the narrow body cars.
someone in the thread said that offsets aren’t ideal but in reality, they are perfectly fine.
Great looking car. As I am considering to upgrade the wheels on my GTS coupe I did some research in the last days a out Porsche cars.
My findings are below.
1) GT2/3 RS use identical wheel specs and offsets. Big wheel manufacturers with soecialispecia in lightweight wheels they propose IDENTICAL after market wheel specs with OEM. I do believe that no one would like to take a risk and change factory offsets in these RS cars.
Front 9.5 X 20 ET50
Rear 12.5 X 21 ET 48
2) GT3 cars used rear offset 47 therefore after market lightweight wheels proposed identical offset in the rear. There is only deviation in front in order to increase the width of the wheels i suppose but not quite clear about high performance wheels specs.
Front 20 X 9 ET 55
Rear 20 X 12 ET 47
Aftermarket wheels proposed
Front 20 X 9 ET 44
Rear 20 X 12 ET47
3) Turbo, Turbo S cars used offsets as below
Front 20 X 9 ET 51
Rear 20 X 11.5 ET 56
After market wheels for Turbo, Turbo S usually proposed common setup with GT3 car.
4) GTS cars have identical wheels specs with Turbo, Turbo S but quite different offset in the rear
Front 20 X 9 ET 51
Rear 20 X 12 ET 63.
I tried yesterday to study about RAS and based on my understanding only GTS has RAS comparing to Turbo, Turbo S, GT3, GT2/3 RS cars. I did not managed to find in the configuration RAS for other models only for GTS.
Not sure is other models have RAS as default.
Aftermarket lightweight wheels in front proposed same solution as GT3, Turbo, Turbo S wheels
Front 20 X 9 ET44.
Rear solution becomes challenge as the only option for lightweight wheels is 20 X 12 ET47 same specs as GT3.
Based on feedback from ryandar1979 GT3 wheels fit perfectly the GTS and I am not expert to challenge the statement but I would feel much more safe in case I had the option to uogrupg my OEM GTS wheels with similar or identical specs of GTS OEM specs follow same concept from GT2/3 RS cars or GT3 car esoeciaesp in the rear that RAS exists.
Another challenge for GTS wheels is that as centerlocks are forced wheels they are guite light therefore in order for someone to seriously upgrade the wheel weight needs to consider only lightweight options which are not so many as aftermarket.
06-06-2018, 11:12 PM
GTS vs GT3 wheel (and axle sizes), Centerlock questions, etc. Wheel experts needed!
