991.1 wheels ≠ 991.2 wheels
10-22-2018, 01:47 PM
#1
Rennlist Member
Thread Starter
991.1 wheels ≠ 991.2 wheels
Having just gone through this, and referenced it in a couple of other threads, a public service message to 991.2 owners and 991.1 owners alike:
There are a lot of aftermarket wheels available for the 991.1 that are also offered by some often knowledgeable retailers and wholesalers who say those wheels fit a 991.2...but they don't. My experience was with a 20x11.5 rear to replace the factory wheels of the same size. The stock wheels were ET76 while the aftermarket wheels were ET62. With the new N-spec Michelins, the look was very dragster. With N-spec Pirellis, which have sidewalls that tilt in, it was a little better but still didn't look right. The effect, not surprisingly, was like adding a 14mm spacer in the rear of the 991.2 (a 911 that, unlike the 991.1, already has its rear fenders pretty well stuffed from the factory). Yes, you can try it—but some (all?) retailers won't be too happy to get the wheels and tires back after they've been mounted.
My hope is that the wheel companies will catch on and do a 991.2 rear to match up with their fronts for the 991. It's gonna take a little work to make them look right, as it has to be a pretty flat wheel. IMO, the maximum offset change in the rear, at least on a Carrera/S/T, is 5mm or so, even when the car is lowered (as mine is). YMMV, but I wouldn't go past ET71~ unless you like "poke", and staying with ET76~ allows the option of adding a 5mm spacer.
There are a lot of aftermarket wheels available for the 991.1 that are also offered by some often knowledgeable retailers and wholesalers who say those wheels fit a 991.2...but they don't. My experience was with a 20x11.5 rear to replace the factory wheels of the same size. The stock wheels were ET76 while the aftermarket wheels were ET62. With the new N-spec Michelins, the look was very dragster. With N-spec Pirellis, which have sidewalls that tilt in, it was a little better but still didn't look right. The effect, not surprisingly, was like adding a 14mm spacer in the rear of the 991.2 (a 911 that, unlike the 991.1, already has its rear fenders pretty well stuffed from the factory). Yes, you can try it—but some (all?) retailers won't be too happy to get the wheels and tires back after they've been mounted.
My hope is that the wheel companies will catch on and do a 991.2 rear to match up with their fronts for the 991. It's gonna take a little work to make them look right, as it has to be a pretty flat wheel. IMO, the maximum offset change in the rear, at least on a Carrera/S/T, is 5mm or so, even when the car is lowered (as mine is). YMMV, but I wouldn't go past ET71~ unless you like "poke", and staying with ET76~ allows the option of adding a 5mm spacer.
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tourenwagen (09-24-2020)
10-22-2018, 02:21 PM
#2
It's also different for widebody vehicles (4/4S/GTS/GT3).
Personally, 10-15mm lower offsets in the rear are perfect for me and anything less is slightly disappointing. Guys with Center locks can't deal with spacers so if you want a lower offset, it's all in the wheel.
I believe widebody wheels (OEM or aftermarket) sit really well on narrow body cars. The rear wheel also gets a more concave look vs the narrow body which is more of a flat wheel.
Personally, 10-15mm lower offsets in the rear are perfect for me and anything less is slightly disappointing. Guys with Center locks can't deal with spacers so if you want a lower offset, it's all in the wheel.
I believe widebody wheels (OEM or aftermarket) sit really well on narrow body cars. The rear wheel also gets a more concave look vs the narrow body which is more of a flat wheel.
10-22-2018, 03:53 PM
#3
Having just gone through this, and referenced it in a couple of other threads, a public service message to 991.2 owners and 991.1 owners alike:
There are a lot of aftermarket wheels available for the 991.1 that are also offered by some often knowledgeable retailers and wholesalers who say those wheels fit a 991.2...but they don't. My experience was with a 20x11.5 rear to replace the factory wheels of the same size. The stock wheels were ET76 while the aftermarket wheels were ET62. With the new N-spec Michelins, the look was very dragster. With N-spec Pirellis, which have sidewalls that tilt in, it was a little better but still didn't look right. The effect, not surprisingly, was like adding a 14mm spacer in the rear of the 991.2 (a 911 that, unlike the 991.1, already has its rear fenders pretty well stuffed from the factory). Yes, you can try it—but some (all?) retailers won't be too happy to get the wheels and tires back after they've been mounted.
My hope is that the wheel companies will catch on and do a 991.2 rear to match up with their fronts for the 991. It's gonna take a little work to make them look right, as it has to be a pretty flat wheel. IMO, the maximum offset change in the rear, at least on a Carrera/S/T, is 5mm or so, even when the car is lowered (as mine is). YMMV, but I wouldn't go past ET71~ unless you like "poke", and staying with ET76~ allows the option of adding a 5mm spacer.
There are a lot of aftermarket wheels available for the 991.1 that are also offered by some often knowledgeable retailers and wholesalers who say those wheels fit a 991.2...but they don't. My experience was with a 20x11.5 rear to replace the factory wheels of the same size. The stock wheels were ET76 while the aftermarket wheels were ET62. With the new N-spec Michelins, the look was very dragster. With N-spec Pirellis, which have sidewalls that tilt in, it was a little better but still didn't look right. The effect, not surprisingly, was like adding a 14mm spacer in the rear of the 991.2 (a 911 that, unlike the 991.1, already has its rear fenders pretty well stuffed from the factory). Yes, you can try it—but some (all?) retailers won't be too happy to get the wheels and tires back after they've been mounted.
My hope is that the wheel companies will catch on and do a 991.2 rear to match up with their fronts for the 991. It's gonna take a little work to make them look right, as it has to be a pretty flat wheel. IMO, the maximum offset change in the rear, at least on a Carrera/S/T, is 5mm or so, even when the car is lowered (as mine is). YMMV, but I wouldn't go past ET71~ unless you like "poke", and staying with ET76~ allows the option of adding a 5mm spacer.
Wide body and narrow body will affect the wheel off set. You have to look at the wheel off set not just the size of the tire. If you have a tire with too large of an off set you can adjust with spacers. http://willtheyfit.com can help.
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Lthrnck (09-30-2022)
10-22-2018, 04:15 PM
#4
Instructor
It sounds to me like this is simply a wide body vs. narrow body issue. Stout bought wide body (4/4S) wheels and put them on a narrow body car. I could be wrong...
10-22-2018, 06:31 PM
#5
Rennlist Member
Thread Starter
It's also different for widebody vehicles (4/4S/GTS/GT3).
Personally, 10-15mm lower offsets in the rear are perfect for me and anything less is slightly disappointing. Guys with Center locks can't deal with spacers so if you want a lower offset, it's all in the wheel.
I believe widebody wheels (OEM or aftermarket) sit really well on narrow body cars. The rear wheel also gets a more concave look vs the narrow body which is more of a flat wheel.
Personally, 10-15mm lower offsets in the rear are perfect for me and anything less is slightly disappointing. Guys with Center locks can't deal with spacers so if you want a lower offset, it's all in the wheel.
I believe widebody wheels (OEM or aftermarket) sit really well on narrow body cars. The rear wheel also gets a more concave look vs the narrow body which is more of a flat wheel.
Wide body and narrow body will affect the wheel off set. You have to look at the wheel off set not just the size of the tire. If you have a tire with too large of an off set you can adjust with spacers. http://willtheyfit.com can help.
Anyway, just wanted to put this out there for folks, as there seems to be little awareness of this change. Most people don't understand offsets, which can be counter-intuitive due to their numbering system. In my case, I trusted some (rightly) trusted resources out there, and ended up on calls + trying to "make it work" with a wheel that's designed for the 991.1 mis-applied on a 991.2. I think this issue will become a bigger one as 991.2 cars age and enthusiasts begin to mod them—and as Carrera T drivers look for a set of track wheels.
10-22-2018, 07:36 PM
#6
Rennlist Member
That’s correct. The narrow body 991.2 requires 49 front and 76 rear offsets. Exact offsets can be ordered from HRE.
Last edited by 4pipes; 10-22-2018 at 10:10 PM.
10-22-2018, 08:40 PM
#7
Rennlist Member
Thread Starter
Custom wheels = no problem (but make sure they have 991.2 offsets and don't just do 991.1 offsets because it's a 991)
Manufactured wheels = caveat emptor
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10-22-2018, 10:29 PM
#8
Originally Posted by 4pipes
That’s correct. The narrow body 991.2 requires 49 front and 76 rear offsets. Exact offsets can be ordered from HRE.
Front 8.5 x 20 et 49
Rear 11.5 x 29 et 56
The info above was not confirmed, instead there is discussion of the rear have an et of 76 (narrow body only )?
10-23-2018, 12:12 AM
#9
Rennlist Member
Having just gone through this, and referenced it in a couple of other threads, a public service message to 991.2 owners and 991.1 owners alike:
There are a lot of aftermarket wheels available for the 991.1 that are also offered by some often knowledgeable retailers and wholesalers who say those wheels fit a 991.2...but they don't. My experience was with a 20x11.5 rear to replace the factory wheels of the same size. The stock wheels were ET76 while the aftermarket wheels were ET62. With the new N-spec Michelins, the look was very dragster. With N-spec Pirellis, which have sidewalls that tilt in, it was a little better but still didn't look right. The effect, not surprisingly, was like adding a 14mm spacer in the rear of the 991.2 (a 911 that, unlike the 991.1, already has its rear fenders pretty well stuffed from the factory). Yes, you can try it—but some (all?) retailers won't be too happy to get the wheels and tires back after they've been mounted.
My hope is that the wheel companies will catch on and do a 991.2 rear to match up with their fronts for the 991. It's gonna take a little work to make them look right, as it has to be a pretty flat wheel. IMO, the maximum offset change in the rear, at least on a Carrera/S/T, is 5mm or so, even when the car is lowered (as mine is). YMMV, but I wouldn't go past ET71~ unless you like "poke", and staying with ET76~ allows the option of adding a 5mm spacer.
There are a lot of aftermarket wheels available for the 991.1 that are also offered by some often knowledgeable retailers and wholesalers who say those wheels fit a 991.2...but they don't. My experience was with a 20x11.5 rear to replace the factory wheels of the same size. The stock wheels were ET76 while the aftermarket wheels were ET62. With the new N-spec Michelins, the look was very dragster. With N-spec Pirellis, which have sidewalls that tilt in, it was a little better but still didn't look right. The effect, not surprisingly, was like adding a 14mm spacer in the rear of the 991.2 (a 911 that, unlike the 991.1, already has its rear fenders pretty well stuffed from the factory). Yes, you can try it—but some (all?) retailers won't be too happy to get the wheels and tires back after they've been mounted.
My hope is that the wheel companies will catch on and do a 991.2 rear to match up with their fronts for the 991. It's gonna take a little work to make them look right, as it has to be a pretty flat wheel. IMO, the maximum offset change in the rear, at least on a Carrera/S/T, is 5mm or so, even when the car is lowered (as mine is). YMMV, but I wouldn't go past ET71~ unless you like "poke", and staying with ET76~ allows the option of adding a 5mm spacer.
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stout (05-25-2020)
10-23-2018, 12:55 AM
#10
Rennlist Member
Thread Starter
Front - 8.5 x 20 ET51 - 245/35 ZR 20 (91Y)
Rear - 11 x 20 ET70 - 295/30 ZR 20 (101Y) XL
991.2 Carrera-line narrow-body offsets for 20-inch wheels:
Front - 8.5 x 20 ET 49 - 245/35 ZR 20
Rear - 11.5 x 20 ET 76 - 305/30 ZR 20 (note: offset "only" changed 6mm, but wheel is further out in fender, as if on a spacer, also)
991.1 Carrera-line wide-body offsets for 20-inch wheels:
Front - 8.5 x 20 ET 51 - 245/35 ZR 20
Rear - 11 x 20 ET 52 - 305/30 ZR 20
991.2 Carrera-line wide-body offsets for 20-inch wheels:
Front - 8.5 x 20 ET 49 - 245/35 ZR 20
Rear - 11.5 x 20 ET 56 - 305/30 ZR 20
^ Above is best of my knowledge, and I encourage others to check the info; PCNA's configurator lists a number of 991.2 S/4S/GTS offsets incorrectly, which doesn't help matters. Please also note that there is an "XXL" extra wide body for the 991, used for the 911 Turbo/S and GT3/GT2 RS—but those live in their own forums.
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10-23-2018, 11:58 AM
#11
Rennlist Member
Stout, your alert was a good one and the ongoing discussions certainly made it clear that this isn't well understood. Well done!
It was an interesting development that Porsche decide to go to such a more aggressive fitment on the 991.2 Carreras... as you are saying the rear wheels are nearly flush with the outer wheel wells with factory fitment. Given the small difference in published wheel offsets between 991.1 and 991.2 wheels, its clear that the tire mounting points on the hubs are several mm farther out on the 991.2 models than on the 991.1 cars... I'd guess somewhere between 6mm and 9mm farther out.
I previously had HRE wheels on my 991.1 that used effectively 13mm more offset (after taking the .5" wider wheels into account) than stock on the rears to get the wheels just as flush as it comes from the factory on the 991.2 (effectively the same position as a 13mm spacer on a stock wheel). It made it easy to decide not to mess around with spacers on my 991.2.
It was an interesting development that Porsche decide to go to such a more aggressive fitment on the 991.2 Carreras... as you are saying the rear wheels are nearly flush with the outer wheel wells with factory fitment. Given the small difference in published wheel offsets between 991.1 and 991.2 wheels, its clear that the tire mounting points on the hubs are several mm farther out on the 991.2 models than on the 991.1 cars... I'd guess somewhere between 6mm and 9mm farther out.
I previously had HRE wheels on my 991.1 that used effectively 13mm more offset (after taking the .5" wider wheels into account) than stock on the rears to get the wheels just as flush as it comes from the factory on the 991.2 (effectively the same position as a 13mm spacer on a stock wheel). It made it easy to decide not to mess around with spacers on my 991.2.
10-23-2018, 06:11 PM
#12
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What we experienced with the 991.2 Narrow body is that is has a lot more room for the wheels in the rear. Our most aggressive recommendation on 991.1 narrow body cars was 11.5" in the rear. With the 991.2's we've done 12.5" rears and it fit like a glove (with a correctly chosen offset of course).
21"x12.5" HRE P200's on a 325 tire below
21"x12.5" HRE P200's on a 325 tire below
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Follow us on YouTube: www.youtube.com/user/WheelsBoutique
Largest Dealer In The World for HRE Wheels, ANRKY Wheels, Vorsteiner Wheels & Aero, Akrapovic Exhaust, & iPE Exhaust
BBS, Forgeline, & TechArt Premium Dealer
Brembo / Rotiform / KW / H&R / Novitec / Brabus / Mansory and tons more...
10-23-2018, 06:46 PM
#13
Racer
Great alert Pete, hopefully saves some people the headache of finding out too late. I have a base 991.2, I kept the stock wheels but wanted to space them out a bit. I looked at the rear and it is pretty much perfect in and out (to my eye) from the factory so I left the rear as is and just used 7mm spacers for the front only. Techart springs and done.
10-23-2018, 06:54 PM
#14
991.1 Carrera-line narrow body offsets for 20-inch wheels:
Front - 8.5 x 20 ET51 - 245/35 ZR 20 (91Y)
Rear - 11 x 20 ET70 - 295/30 ZR 20 (101Y) XL
991.2 Carrera-line narrow-body offsets for 20-inch wheels:
Front - 8.5 x 20 ET 49 - 245/35 ZR 20
Rear - 11.5 x 20 ET 76 - 305/30 ZR 20 (note: offset "only" changed 6mm, but wheel is further out in fender, as if on a spacer, also)
991.1 Carrera-line wide-body offsets for 20-inch wheels:
Front - 8.5 x 20 ET 51 - 245/35 ZR 20
Rear - 11 x 20 ET 52 - 305/30 ZR 20
991.2 Carrera-line wide-body offsets for 20-inch wheels:
Front - 8.5 x 20 ET 49 - 245/35 ZR 20
Rear - 11.5 x 20 ET 56 - 305/30 ZR 20
^ Above is best of my knowledge, and I encourage others to check the info; PCNA's configurator lists a number of 991.2 S/4S/GTS offsets incorrectly, which doesn't help matters. Please also note that there is an "XXL" extra wide body for the 991, used for the 911 Turbo/S and GT3/GT2 RS—but those live in their own forums.
Front - 8.5 x 20 ET51 - 245/35 ZR 20 (91Y)
Rear - 11 x 20 ET70 - 295/30 ZR 20 (101Y) XL
991.2 Carrera-line narrow-body offsets for 20-inch wheels:
Front - 8.5 x 20 ET 49 - 245/35 ZR 20
Rear - 11.5 x 20 ET 76 - 305/30 ZR 20 (note: offset "only" changed 6mm, but wheel is further out in fender, as if on a spacer, also)
991.1 Carrera-line wide-body offsets for 20-inch wheels:
Front - 8.5 x 20 ET 51 - 245/35 ZR 20
Rear - 11 x 20 ET 52 - 305/30 ZR 20
991.2 Carrera-line wide-body offsets for 20-inch wheels:
Front - 8.5 x 20 ET 49 - 245/35 ZR 20
Rear - 11.5 x 20 ET 56 - 305/30 ZR 20
^ Above is best of my knowledge, and I encourage others to check the info; PCNA's configurator lists a number of 991.2 S/4S/GTS offsets incorrectly, which doesn't help matters. Please also note that there is an "XXL" extra wide body for the 991, used for the 911 Turbo/S and GT3/GT2 RS—but those live in their own forums.
Am I missing something?
