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Tire & Wheel Forum sponsored by The Tire Rack |
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08-15-2019, 10:44 AM | #8251 | |
Scooby Specialist
Member#: 498642
Join Date: Mar 2019
Chapter/Region:
Tri-State
Location: our wrx IS the family sedan
Vehicle:'19 WRX Ltd 6M dgm '08 Mustang GT (the toy) |
Quote:
It's a flange contour that appears to be providing a false flange well outside where the tire sidewall ends up being based on the real flange contour and bead seat dimensions. This is strictly for visual effect, fooling the observer into thinking the tire is stretched more than it really is. Norm
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08-16-2019, 10:50 PM | #8252 |
Scooby Newbie
Member#: 500326
Join Date: Apr 2019
Chapter/Region:
International
Location: Australia
Vehicle:2015 WRX Premium 6MT Stage 2 |
Another couple of questions on the back of the discussion I started in the last page - putting aside differences in fitment in terms of aesthetics, is there an objectively better option between 18x9.5 +38 and 18x9 +35 for this car from a functionality/driving performance perspective?
Would the higher offset but wider width with the 18x9.5 +38 be more in keeping with manufacturer specs as opposed to the lower offset but closer-to-OE width of the 18x9 +35? |
08-17-2019, 10:38 AM | #8253 |
Scooby Newbie
Member#: 501522
Join Date: May 2019
Location: Front Range, Colorado
Vehicle:2019 WRX STI Pearl White |
OEM is 18x8.5 with a 55 offset.
Assuming that only the wheel width matters to keep the same backspacing to avoid rubbing on suspension the 18x9.5 would require a 43 offset. 45 is safe. No way the stock clearance is less than 2mm. The 18x9.0 would require a 48 offset. 50 is safe. To keep it as close to OEM as possible you should stick with no less than a 45 to 50 mm offset. Tire rack shows a wheel 18x9 with a 55 offset for the WRX. So the OEM 55 mm offset is OK with at least some wheels even with a 9 inch width. This implies the stock inside clearance is more than 7mm. The +38 offset is closer than the +35 to OEM, but not enough to matter. Wheel width does not affect scrub radius, only offset does. Change in scrub radius will affect handling during hard stopping, heavy acceleration and hard turns. Wider wheel width affects handling similar to tire width, and will improve handling on dry roads, and slightly decrease handling on wet. |
08-17-2019, 08:40 PM | #8254 | |
Scooby Newbie
Member#: 500326
Join Date: Apr 2019
Chapter/Region:
International
Location: Australia
Vehicle:2015 WRX Premium 6MT Stage 2 |
OEM for my 2015 WRX is 17x8 +55. I'm not sure whether or not that's specific to the AUDM, but according to fastwrx.com's wheel information page there are indeed two specs which could by why we're both thinking of different OEM specs: 18x8.5 +55 with 245/40R18 and 17x8 +55 with 235/45R17.
Quote:
What I've gathered from your post is that the 18x9.5 +38 is likely a better option as far as keeping geometry closest to OEM spec. Based on what Norm has said previously, the other benefits of the wider wheel would include increased lateral resistance and improved turn-in response. On the other hand, would the slightly thinner wheel of the 18x9 +35 in theory reduce rolling resistance and thus have less of a detrimental effect on straight-line performance (i.e. the thinner wheel/tyre will affect acceleration less) as well as fuel economy (not something I'm concerned about)? Coming back to fitment, the 18x9 +35 would be the safer option as the outer edge of the wheel will poke out less than the 18x9.5 +38. Last edited by rst.ack; 08-17-2019 at 08:59 PM. |
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08-17-2019, 10:13 PM | #8255 |
Scooby Newbie
Member#: 487500
Join Date: Jun 2018
Location: Catonsville, MD
Vehicle:2018 WRX |
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08-17-2019, 10:23 PM | #8256 |
Scooby Newbie
Member#: 500326
Join Date: Apr 2019
Chapter/Region:
International
Location: Australia
Vehicle:2015 WRX Premium 6MT Stage 2 |
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08-18-2019, 07:37 AM | #8257 | |
Scooby Newbie
Member#: 501522
Join Date: May 2019
Location: Front Range, Colorado
Vehicle:2019 WRX STI Pearl White |
Oops, I quoted the spec for my STI, not your WRX. But the that doesn't change anything in my answer. The +55 is the most significant number.
Quote:
Both your choices are very close in all aspects, both performance and fit. They are both at the limit of what will fit without rubbing. It may come down to actual tire chosen to determine if it rubs. Last edited by MountainMan10; 08-18-2019 at 07:48 AM. |
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08-18-2019, 09:34 AM | #8258 | |
Scooby Specialist
Member#: 498642
Join Date: Mar 2019
Chapter/Region:
Tri-State
Location: our wrx IS the family sedan
Vehicle:'19 WRX Ltd 6M dgm '08 Mustang GT (the toy) |
Quote:
From that, you should be able to go all the way to the OE +55 offset with 18x9.5 wheels before strut rubbing even starts to be a concern. Norm |
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08-18-2019, 10:10 AM | #8259 |
Scooby Newbie
Member#: 500326
Join Date: Apr 2019
Chapter/Region:
International
Location: Australia
Vehicle:2015 WRX Premium 6MT Stage 2 |
And yet the RPF1s dont come in 18x9.5 +55 The closest I can get is 18x9.5 +45 but they only come in silver and I'm after flat black wheels...
The next best are Rota DPT in 18x9.5 +44 but I can't determine the concavity of that width/offset nor can I find how much extra weight the cast wheels carry over the flow-formed RPF1s (plus I just prefer the looks of the RPF1s). |
08-18-2019, 01:11 PM | #8260 |
Scooby Newbie
Member#: 15870
Join Date: Feb 2002
Location: S. Indiana
Vehicle:2015 WRX Ice Silver Metallic |
I have the DPT's on my 15 WRX.
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08-18-2019, 05:01 PM | #8261 |
Scooby Newbie
Member#: 500326
Join Date: Apr 2019
Chapter/Region:
International
Location: Australia
Vehicle:2015 WRX Premium 6MT Stage 2 |
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08-18-2019, 05:14 PM | #8262 |
Scooby Newbie
Member#: 15870
Join Date: Feb 2002
Location: S. Indiana
Vehicle:2015 WRX Ice Silver Metallic |
18x9.5 +44 hyper black with 255/40 Generals. I like them. I am hoping to lower a bit with coilovers but not sure how easy it will be.
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08-18-2019, 06:01 PM | #8263 |
Scooby Newbie
Member#: 487500
Join Date: Jun 2018
Location: Catonsville, MD
Vehicle:2018 WRX |
The 255/40 looks good. I think I'm going to do that on my next set.
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08-20-2019, 11:03 AM | #8264 | |
Scooby Newbie
Member#: 501522
Join Date: May 2019
Location: Front Range, Colorado
Vehicle:2019 WRX STI Pearl White |
Quote:
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08-23-2019, 03:18 AM | #8265 | |
Scooby Newbie
Member#: 500326
Join Date: Apr 2019
Chapter/Region:
International
Location: Australia
Vehicle:2015 WRX Premium 6MT Stage 2 |
Quote:
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08-27-2019, 04:45 PM | #8266 |
Scooby Newbie
Member#: 357191
Join Date: May 2013
Chapter/Region:
SCIC
Location: Socal
Vehicle:2016 WRX ISM |
Last edited by kaeknows; 09-01-2019 at 08:45 PM. |
09-04-2019, 08:04 PM | #8267 |
Scooby Newbie
Member#: 451587
Join Date: Jul 2016
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Updated: 275/30R19 with 19x9.0 BBS/RCF Wheel.
Here is my 2015 STi with 275s.
Tire: Michelin Pilot Sport A/S 3+ Size: 275/30ZR19 6-Rib Tread Design Serv. Desc: 96Y UTQG: 500 AA A Wheel: Lexus / BBS RC-F 19x9.0 +50mm. https://i.imgur.com/gX5N51J.jpg https://i.imgur.com/HRoLFft.jpg https://i.imgur.com/usqZKmC.jpg https://i.imgur.com/YQt0uLe.jpg https://i.imgur.com/jFBDkSu.jpg Stock Suspension, No fender roll / No rub even with All the Passenger and Cargo. About Three finger space between tire and Stock suspension. So close and Clears. Thank you. Last edited by evei0326; 09-12-2019 at 05:55 PM. Reason: Photo not displaying imgur |
09-05-2019, 07:21 AM | #8268 | |
Scooby Specialist
Member#: 498642
Join Date: Mar 2019
Chapter/Region:
Tri-State
Location: our wrx IS the family sedan
Vehicle:'19 WRX Ltd 6M dgm '08 Mustang GT (the toy) |
Quote:
Imgur can't find them for me when I go to your imgur.com/xxxxxxx address directly, either. Norm |
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09-05-2019, 04:49 PM | #8269 |
Scooby Newbie
Member#: 451587
Join Date: Jul 2016
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Trying Again With Flickr
Please Delete this post.
I think I have fix. Last edited by evei0326; 09-05-2019 at 04:57 PM. Reason: Photo did not load. |
09-09-2019, 01:19 PM | #8270 |
Scooby Newbie
Member#: 341458
Join Date: Dec 2012
Vehicle:2016 WRX Limited LPB |
I've been trying to nail down a definitive answer, but I keep getting conflicting information. I mounted a set of 18x9 +35 wheels, wrapped in 255/40s. I'm personally getting a bit of rub in the rear when I have weight in the back. It seems to be that little plastic hump on the underside of the rear arches. Aside from that, no other contact. All of this is on stock suspension
I've seen others say that they've fit my size, around my size, or even my size with bigger tires and zero modification. I've also seen, and been told, that rolling fenders is necessary. At this point I'm just confused, and wondering if there's anything I can do (not really a fan of rolling fenders) to get those wheels to work without rub. I've been thinking about a 255/35 to give myself a little extra clearance as well; but, any help that anybody can give me would be greatly appreciated. |
09-09-2019, 08:50 PM | #8271 |
Scooby Newbie
Member#: 487500
Join Date: Jun 2018
Location: Catonsville, MD
Vehicle:2018 WRX |
What suspension are you on? Maybe the stock 245/40 would clear up your issue?
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09-09-2019, 09:28 PM | #8272 | |
Scooby Newbie
Member#: 431618
Join Date: Oct 2015
Chapter/Region:
MAIC
Location: Virgina
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Quote:
Do you have any shots from directly behind or head on? |
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09-10-2019, 09:40 AM | #8273 | |
Scooby Newbie
Member#: 341458
Join Date: Dec 2012
Vehicle:2016 WRX Limited LPB |
Quote:
I'll take a picture later to show where on the tire it's making contact. Also try to check it the springs look like they are non-oem. Also not sure if this helps to determine, but this is how it sat on the stock wheels. |
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09-11-2019, 10:40 PM | #8274 | |
Scooby Newbie
Member#: 487500
Join Date: Jun 2018
Location: Catonsville, MD
Vehicle:2018 WRX |
Quote:
As for tires, going to a 35 series is going to be under sized from stock. I would try to stick to 245/40 if you can. |
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09-12-2019, 04:44 PM | #8275 | |
Scooby Newbie
Member#: 341458
Join Date: Dec 2012
Vehicle:2016 WRX Limited LPB |
Quote:
I'm going to have to check the suspension this weekend to see if any lowering springs were installed, or if they're just shot in general. Also, this is how it sits with the wheels on: |
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