Wheel change help
Banned
Joined: Jan 2013
Posts: 26,140
Likes: 5,464
From: Chicagoland Area
Sport Classics. Great wheels! Fit...check here:
https://www.suncoastparts.com/product/SKU50YRWHL.html
https://www.suncoastparts.com/product/SKU50YRWHL.html
Burning Brakes
Joined: Dec 2013
Posts: 899
Likes: 60
From: Chalfont, PA
Also note that unless you change the option, your '18 GTS will come with Center Locks, and those Sport Classics never came in CL, only 5-bolt pattern. If you optioned your GTS with 5-bolt then you may be good to go, depending what the fitment tells you. I suspect they'll fit, as the 50th and the Club Coupe had the wide-body.
Thread Starter
Rennlist Member
Joined: Oct 2014
Posts: 325
Likes: 38
From: DFW, TX
Yes, I ordered the 5 lug. But I dont have any documents or anything yet, so no idea what the fitment is defined as. I barely understand 20 inch.
Ill dig around for some GTS specs and try to figure it out. What I was hoping was somebody smarter than me would know for sure.
☺️
Ill dig around for some GTS specs and try to figure it out. What I was hoping was somebody smarter than me would know for sure.
☺️
Burning Brakes
Joined: Dec 2013
Posts: 899
Likes: 60
From: Chalfont, PA
Yes, I ordered the 5 lug. But I dont have any documents or anything yet, so no idea what the fitment is defined as. I barely understand 20 inch.
Ill dig around for some GTS specs and try to figure it out. What I was hoping was somebody smarter than me would know for sure.
☺️
Ill dig around for some GTS specs and try to figure it out. What I was hoping was somebody smarter than me would know for sure.
☺️
Pro
Joined: Jul 2009
Posts: 674
Likes: 17
Hi JFerraro,
I've recently spent time learning about all this so I can at least provide a little guidance. The 3 dimensions you need to concern yourself with as it relates to wheels are the width (front on a 991.2 GTS is 9" and the rears are 12"), the circumference (which is 20" on the GTS), and the offset. The offset is the dimension that is measured in millimeters and typically follows the letters ET, and it represents the offset of the outside of the wheel from the wheel hub.
I recently bought some used 991.1 GT3 winter wheels and tires for my GTS and after buying them, realized their dimensions didn't match up *exactly* with the dimensions of the wheels that looked identical to them on the Suncoast website. So, I called my dealer and I called Suncoast to confirm that they would still fit my 991.2 GTS and everyone reacted like the sky was falling and if the part numbers didn't match exactly that these wheels could not possibly be compatible with my car. My point is, this is a complex issue with no upside for your dealership to ensure you the wheels will fit. I got comfortable that the ones I bought were right based on the dimensions, and I took careful pictures before removing the stock wheels to ensure that the clearances with the winters were comparable. And they were. And the sky didn't fall. And the wheels fit. If you're not adventurous, at a minimum have your dealer mount the wheels on the car for you and check all the clearances of the rotors and the suspension parts to be sure you won't have any problems.
I've recently spent time learning about all this so I can at least provide a little guidance. The 3 dimensions you need to concern yourself with as it relates to wheels are the width (front on a 991.2 GTS is 9" and the rears are 12"), the circumference (which is 20" on the GTS), and the offset. The offset is the dimension that is measured in millimeters and typically follows the letters ET, and it represents the offset of the outside of the wheel from the wheel hub.
I recently bought some used 991.1 GT3 winter wheels and tires for my GTS and after buying them, realized their dimensions didn't match up *exactly* with the dimensions of the wheels that looked identical to them on the Suncoast website. So, I called my dealer and I called Suncoast to confirm that they would still fit my 991.2 GTS and everyone reacted like the sky was falling and if the part numbers didn't match exactly that these wheels could not possibly be compatible with my car. My point is, this is a complex issue with no upside for your dealership to ensure you the wheels will fit. I got comfortable that the ones I bought were right based on the dimensions, and I took careful pictures before removing the stock wheels to ensure that the clearances with the winters were comparable. And they were. And the sky didn't fall. And the wheels fit. If you're not adventurous, at a minimum have your dealer mount the wheels on the car for you and check all the clearances of the rotors and the suspension parts to be sure you won't have any problems.
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Pro
Joined: Nov 2017
Posts: 731
Likes: 163
From: BATH
I have spent some time with offsets wheel widths an such on several cars. I recently fitted 11.5 an 10 x 20 on an M5 with specific offsets, specced by myself. The GTS 991.1 has 9x20et51F and 11.5x20et48 the 991.2 has 12x20et63 at the back the same as the 991.1 at the front, the GT3 runs 9x20 et55 and 12x20 et47, I presume that the position of the mounting plate on the GTE, 991.1 and 991.2 are the same, visually this would make sense, but there could be some small differences. I do wonder why the front offset of the GT3 is marginally less than than the GTS so perhaps the mounting face is a few mm further out. I might look at the specified track to see. This will help you see where the wheel might be in comparison to other wheels http://www.willtheyfit.com/index.php...=12&offset2=63
Regarding the 5 stud wheels, you can easily fit hubcentric spacers and move wheels a little further out if clearance allows
Regarding the 5 stud wheels, you can easily fit hubcentric spacers and move wheels a little further out if clearance allows
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Thread Starter
Rennlist Member
Joined: Oct 2014
Posts: 325
Likes: 38
From: DFW, TX
Thanks to everybody for chiming in....this is great information and definitely helps!!
ps Carrera: I wrestled long and hard between the two wheel types. 5 lug won out in the end for a couple of reasons in my mind/preference; it's too late to change it now regardless
ps Carrera: I wrestled long and hard between the two wheel types. 5 lug won out in the end for a couple of reasons in my mind/preference; it's too late to change it now regardless
Thread Starter
Rennlist Member
Joined: Oct 2014
Posts: 325
Likes: 38
From: DFW, TX
So, based upon the replies and Suncoast's page, the fronts are direct replacement--same exact dimensions.
The rears are an inch thinner, and offset is -48 versus -63 stock.....so a 15mm spacer (little over half an inch) puts the outer face back where it belongs--albeit with an inch thinner rim (11 vs. 12" stock).
Have I wrapped my brain around this correctly?
The rears are an inch thinner, and offset is -48 versus -63 stock.....so a 15mm spacer (little over half an inch) puts the outer face back where it belongs--albeit with an inch thinner rim (11 vs. 12" stock).
Have I wrapped my brain around this correctly?
Pro
Joined: Nov 2017
Posts: 731
Likes: 163
From: BATH
The offset if 15mm more with the Sport classic wheels (63-48mm) Offsets are negative so the smaller the offset the further out the wheel will be. The the wheel has shrunk by 1/2 inch, so this will be 6mm less on the inside and the outside. So the rim will be 15-6 = 9mm further out, but the tyre will bulge a little less and has moved out by the 15mm you spoke of. Tyre sizing (not wheel sizing and is quite important in reality) 1/2" will give you approx 2mm a side of increased 'bulge' or decreased so.....
Assuming the face of the hub with a 5 stud fitting is exactly the same as centrelock then you will have a rim edge 9mm further out and a tyre 13mm further out.
Assuming the face of the hub with a 5 stud fitting is exactly the same as centrelock then you will have a rim edge 9mm further out and a tyre 13mm further out.
Thread Starter
Rennlist Member
Joined: Oct 2014
Posts: 325
Likes: 38
From: DFW, TX
Yes, I see that 11.5 error now. Thanks.
Oy, 1/2" further out has me worried about rolling the $8000 dice. Doesn't seem like much room for error. I've never owned a car with such tight fender-tyre (
) spacing before. And the hub face question needs to be answered definitively. I'll see what my SA and his parts guy have to say.
Thanks again!
Oy, 1/2" further out has me worried about rolling the $8000 dice. Doesn't seem like much room for error. I've never owned a car with such tight fender-tyre (
) spacing before. And the hub face question needs to be answered definitively. I'll see what my SA and his parts guy have to say.Thanks again!