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Old 07-18-2019, 11:18 AM   #8201
jcb-memphis
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Or either of the NJMP outlines . . .


Norm
LOL

When on those, will add....

DD car - subaru sti's are an amazing thing. We are very lucky to have them as the world goes boring. (my opinion only - thank you subaru)

The factory can race any size tire on the car (NBR) and they keep winning in the 2.0 L class on 18" tires. Nuff said. Drive now is sublime. Highly recommended on this chassis.
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Old 07-23-2019, 02:29 PM   #8202
RedFoxsi
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Default 2019 Sti

so I will looking at useing my car at the track.
currently 1.7 camber front and rear
Stock ride hight
might lower .5 inch with ohlins coilovers in the future.
I got a good deal on some 18x9.5 et 38
Can I fit 265/35r18 with no rolling? this car will be used hard so suspension will compress. Will I get rubbing ?
Looking to use Federal 595rs-r and Rs-rr. might use Federal FZ-201 later
Or should i stick with 255/35r18?

THANK YOU!! in advance!
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Old 07-27-2019, 08:03 PM   #8203
flipflop214
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anyone running 18x9.5 +38 with 255/40/18 tires? dropped on springs or coils.. any fender mods you needed to do?
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Old 07-28-2019, 08:53 PM   #8204
rymaggi
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2016 STI

Enkei RPF1 18x9.5 +38
265/35/18 RE71-r's

10mm Spacers up front w/ ARP studs.
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Old 07-29-2019, 10:53 PM   #8205
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anyone running 18x9.5 +38 with 255/40/18 tires? dropped on springs or coils.. any fender mods you needed to do?
That's exactly the same setup I plan to run next summer. Will be on stock suspension though.

Hopefully someone can comment on this setup.
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Old 07-30-2019, 01:00 AM   #8206
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Old 07-30-2019, 09:00 PM   #8207
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Hey all! I have searched a ton up to about the first 60 pages on this thread, but cant seem to find the info I am looking for. As I have read different opinions. and being that the car is about 2 weeks away from delivery I want to order my wheels/tires.. I plan to get Enkei Raijin 18x9.5+35, and now trying to find the right tire. I THINK I've narrowed it down to 265/35 or 255/35.. I like the slight poke which is why I'm going with that size wheel. So I've read some saying that a 9.5 wheel with 265 tires are not necessary at the power coming from the WRX (I am going stage 2 w/protune after the break in if that makes a difference). Would a 265/35 tire be best from a functional standpoint ? or maybe 255/35 is good enough ? Though I've heard 255 will require some tire stretch which I don't like. I am just so stumped trying to find the best tire for those wheels and have heard varying opinions and I am no expert. Also I PROBABLY plan to stay at stock ride height. I appreciate any help in finding the right tires

Edit: So after more reading I've read that 265 tires are not needed and after a certain point are just adding weight, but I've also read that 265/35 are closer to stock diameter than the 255/35. But not exactly sure how important that is. I dont know much about wheel/tire fitment so I'm just confused on what tires would be best to get for those wheels. Thanks again and I appreciate any input

Last edited by LouRoc24; 07-31-2019 at 02:53 AM.
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Old 07-31-2019, 07:36 PM   #8208
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18x9.5 +22, 255/35 AD08R
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Old 08-01-2019, 05:44 PM   #8209
LouRoc24
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Help anyone?? I was surprised and got my car early yesterday! '19 WRX CWP. I want to order my wheels/tires already but cant decide on what sizes to get. I was leaning toward Enkei Raijin 19x9.5 +35 with either 265/35 or 255/35... buttttt I'm really having second thoughts due to internet searches and seeing this guy 'Demand Common Sense' strongly stating on reddit that 9.5 wheels are such a bad fitment for these cars and saying tests have been done showing up to 20 WHP less on the dyno just based on having 9.5 wheels!? That obviously makes me second guess what I want. I kinda like the slight poke and the concave look with 9.5 Raijin's, but not if its gonna be so detrimental to the cars performance.. Should I just get 8.5 Raijin's +38 or +50 and give up the slight poke and concave look, if its gonna be that much of a negative impact on performance going 9.5 ??

Since this model has been around about 5 years now can anyone chime in and help me decide ?
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Old 08-01-2019, 06:51 PM   #8210
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I would suggest going with the Enkei Raijin 19x8.5 +50. Get the 255/35R19 if you want a wider tire. Shouldn't have any fitment issues.

I got the Prodrive GT1 18x8.5 +53 for my winter wheels. Might get the Raijin for summer when my tires wear out.
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Old 08-01-2019, 07:51 PM   #8211
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Originally Posted by MountainMan10 View Post
I would suggest going with the Enkei Raijin 19x8.5 +50. Get the 255/35R19 if you want a wider tire. Shouldn't have any fitment issues.

I got the Prodrive GT1 18x8.5 +53 for my winter wheels. Might get the Raijin for summer when my tires wear out.
Did you mean you suggest 18x8.5 +50 ? (I wanna keep it at 18's)

So considering that I actually like the look of the slight poke and concave look of the Raijin's 18.x9.5 +35, are the performance downsides of that size that major that I should give that up and go a more conservative 18x8.5 +50 ? If so that's what I'll do, unless the performance downsides are not that noticeable. It'll be my daily driver with some spirited driving but that's about it. But then again if what that guy said was true about losing 20 WHP (or anywhere close to that) by just going with that much more of a wheel, then yeah I'll stick to 8.5. I'm just not sure exactly how much the impact will really be
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Old 08-02-2019, 10:37 AM   #8212
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From all the research I have done and from working in the alignment industry for 20 years, I would not go below a +50 offset.

If you are going to be optimizing your car for the track there are some performance gains with going to a lower offset. But on the street you should stay close to the stock +55.

We both said 19. Must have been a typo.

If you want a more flush look go with the +45.

I doubt the lower offset has any effect on WHP. It just makes turning a bit softer and at the extreme limits there is less warning of impending break away.

Wider tires do suck up power. That's why I would not go wider than 255/40r18. You can put the 255 on an 8.5" wheel.

I just put OEM wheels on my F150. I went with a 8.5 wide with +39 offset. OEM is 7.5 and +44 offset. I was surprised how much more flush they look. The slightly lower offset and wider wheel makes the tires stick out a lot more. Even that small change has made the steering a bit softer.

I really like how my STI handles. I personally would not go with a low offset just for looks. But I am sure you will find many that disagree with me.
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Old 08-02-2019, 11:21 AM   #8213
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Agree with most everything ↑↑↑

I just don't understand the use of offsets that are any lower than necessary to avoid strut-side rubbing. It's not at all necessary to have up around a whole inch of inboard clearance (depending on the specific tire size and wheel width, most people would be surprised how little is all that's necessary)

But the gains in lateral stiffness you get from running rims out near or at "max-recommended" do outweigh any negatives provided you drive the corners hard enough to notice. I'd be the guy with 255/xx on 9.5" wheels (actually ran that combination on the Mustang).

Torque lost to rotational acceleration of slightly heavier rims is finite but pretty small. Worth maybe a tenth of a second at a typical autocross or a few hundredths at the dragstrip. This can be estimated fairly closely via rotational inertia calculations.


Norm
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Old 08-02-2019, 01:25 PM   #8214
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yeah sounds about right ↑↑↑

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Old 08-02-2019, 01:35 PM   #8215
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Originally Posted by Norm Peterson View Post
Agree with most everything ↑↑↑

I just don't understand the use of offsets that are any lower than necessary to avoid strut-side rubbing. It's not at all necessary to have up around a whole inch of inboard clearance (depending on the specific tire size and wheel width, most people would be surprised how little is all that's necessary)

But the gains in lateral stiffness you get from running rims out near or at "max-recommended" do outweigh any negatives provided you drive the corners hard enough to notice. I'd be the guy with 255/xx on 9.5" wheels (actually ran that combination on the Mustang).

Torque lost to rotational acceleration of slightly heavier rims is finite but pretty small. Worth maybe a tenth of a second at a typical autocross or a few hundredths at the dragstrip. This can be estimated fairly closely via rotational inertia calculations.


Norm


Tl;DR
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Old 08-02-2019, 01:42 PM   #8216
Norm Peterson
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It's actually been verified by test that the autocross run time benefit from dropping 5 lb/corner falls in the 0.1 to 0.2 second per 40-ish second run. I think it was Jason Isley's testing in SCCA's monthly magazine a few years back.

Grassroots Motorsport found up to 0.46 seconds in 55-ish at about 11.5 lb/corner difference.

I think both tests were done using a Miata, whose light weight and low power would exaggerate differences in wheel weight compared to the WRX or most any car with decent-ish power and capable of seating four in any semblance of comfort.


Norm
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Old 08-02-2019, 01:43 PM   #8217
Norm Peterson
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Originally Posted by Stoleyourboard View Post
Tl;DR
Too short;no value


Norm
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Old 08-02-2019, 03:54 PM   #8218
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Too short;no value





Norm


In all seriousness what car do you drive. You talk like an expert but I havenít seen any execution on your end.
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Old 08-02-2019, 03:58 PM   #8219
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Going wider or lower offset doesnt necessarily mean its going to be heavier, stock wheels are pretty heavy 24-25lbs for the 18in enkei's. Dropping X lbs per corner helps tremendously, obviously. From personal experience I went with stock 8.5 to a 9 +35 wheels that were 18lbs or less compared to the stocks, also weight of the tires were the same 245/40 vs 265/35 (25lbs), that's 50lbs vs 43lbs.

So why do the fast cars on the track run wider wheels and bigger tires?

Also in terms of clearance between tires and struts obviously you have to check that, you'd be an idiot to run stupid offset just for it to rub on struts causing major problems. Also not everyone wants to be vanilla and have regular spec wheels, there's always a happy median between.

And this is the wheel and tire fitment thread, if you want to be a purist and elitist go drop that knowledge on the STU section. We can be technical with coil spring rates and suspension setup, corner balance etc, but this section isnt for that. And using a miata for comparison to the heavy wrx isnt fair. 2300+- vs 3200+-

post pics of your current car, would love to see your current setup, not your mustang btw, not trying to discredit your knowledge cause you sure do have a lot to say.

kevin

just examples of fast track cars with "offsets lower than 40 and wheels wider than 255"













Last edited by kaeknows; 08-02-2019 at 04:29 PM.
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Old 08-03-2019, 01:05 AM   #8220
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Quote:
Originally Posted by kaeknows View Post
Going wider or lower offset doesnt necessarily mean its going to be heavier, stock wheels are pretty heavy 24-25lbs for the 18in enkei's. Dropping X lbs per corner helps tremendously, obviously. From personal experience I went with stock 8.5 to a 9 +35 wheels that were 18lbs or less compared to the stocks, also weight of the tires were the same 245/40 vs 265/35 (25lbs), that's 50lbs vs 43lbs.

So why do the fast cars on the track run wider wheels and bigger tires?

Also in terms of clearance between tires and struts obviously you have to check that, you'd be an idiot to run stupid offset just for it to rub on struts causing major problems. Also not everyone wants to be vanilla and have regular spec wheels, there's always a happy median between.

And this is the wheel and tire fitment thread, if you want to be a purist and elitist go drop that knowledge on the STU section. We can be technical with coil spring rates and suspension setup, corner balance etc, but this section isnt for that. And using a miata for comparison to the heavy wrx isnt fair. 2300+- vs 3200+-

post pics of your current car, would love to see your current setup, not your mustang btw, not trying to discredit your knowledge cause you sure do have a lot to say.

kevin

just examples of fast track cars with "offsets lower than 40 and wheels wider than 255"














bruh that gc8 fitment
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Old 08-03-2019, 09:03 AM   #8221
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So track cars have wide wheels with low offsets... This applies to street cars used for commuting how?
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Old 08-03-2019, 10:07 AM   #8222
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Originally Posted by MountainMan10 View Post
So track cars have wide wheels with low offsets... This applies to street cars used for commuting how?
cus if it works for them it'll sure as hell work for our grocery getters
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Old 08-03-2019, 10:12 AM   #8223
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So track cars have wide wheels with low offsets... This applies to street cars used for commuting how?




Ig I have a track car ??? 21k miles in a year and a half
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Old 08-03-2019, 12:28 PM   #8224
Norm Peterson
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Originally Posted by Stoleyourboard View Post
In all seriousness what car do you drive.
The primary ones are listed under my username. 2019 WRX Limited and 2008 Mustang GT. Not listed is a 2001 Maxima.


Quote:
You talk like an expert but I havenít seen any execution on your end.
I guess there isn't any reason you'd know that I've done nearly all of my own maintenance, repair, and modification work for the last 50 years. Or that I've put a considerable amounts of time into understanding the engineering behind it all. Or that in many cases I'll look for a DIY-workaround before farming out some task to a shop (most recently, differential side bearings onto a Torsen diff, without using a press, this eventually going in the Mustang).

I'd be happy to post pictures except that NASIOC doesn't want me linking to what I've already loaded up on other sites, and won't let me attach pictures directly.

I do have a few things in mind for the WRX but I have not put a timetable on any of them yet. Not even for the tires I'll be getting for when the weather turns colder. I did align the front end out toward the maximum negative cambers that the production components would physically allow. And done a couple of little one-off interior things that I won't go into any further.


Norm
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Old 08-03-2019, 01:00 PM   #8225
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So track cars have wide wheels with low offsets... This applies to street cars used for commuting how?
So, why do track cars have wider wheels and lower offsets?
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