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Old 04-14-2020, 12:29 PM   #8451
kaeknows
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Originally Posted by bamx View Post
Hey would you mind sharing specs of your whole wheel/suspension setup please. That’s damn perfect
ohlins with swift springs, stance lca, apr extended studs in the front w/ 10mm mach v spacers.

advan tc3 18x10 +35mm, yokohama advan ad08 265/35, front fitment is 18x10 +25 due to spacers.





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Old 04-15-2020, 07:44 AM   #8452
Norm Peterson
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Originally Posted by devil doc View Post
Does anyone know if 265/40r18s be used for a 2017 limited stock BBS wheel set up, just looking for an OEM meatier look.

Also does anyone have pictures? I’ve seen a few 255/40r18s tires on the stock 8.5” wheels, but I haven't found any with 265/40r18s. Thanks
What you're proposing is outside the wheel width range that's tire industry approved for that tire size. The tire industry (Tire & Rim Association) has set 9" as the minimum acceptable width wheel for mounting 265/40 tires (255/40's are OK'ed for fitment on 8.5").

It's best to follow T&RA guidelines, and FWIW going outside their wheel width range on the narrow end generally results in somewhat more sidewall heating as you drive on them. Steering precision would also suffer a bit, which your car's VDC might not be too happy about.

40 profile tires aren't supposed to have much visible 'bulge' or sidewall curvature to their appearance.


Norm
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Old 04-15-2020, 12:25 PM   #8453
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The wheel I want comes in the size of 18x9.5 +35. Can I fit a 265/35 tire?



I'd like to avoid rolling or pulling the fenders on a stock suspension. From what I have gathered it seems like I'd either have to go +40 offset or 255 wheels.



My goal is for a flush wheel, minimized the wheel gap, close to stock final diameter, widest wheel possible and no stretched tires.
265/35 is pretty standard on the 2015+.
On stock suspension I dont think you should have any issues. Lowered will be another story...
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Old 04-15-2020, 07:08 PM   #8454
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Originally Posted by Norm Peterson View Post
What you're proposing is outside the wheel width range that's tire industry approved for that tire size. The tire industry (Tire & Rim Association) has set 9" as the minimum acceptable width wheel for mounting 265/40 tires (255/40's are OK'ed for fitment on 8.5").

It's best to follow T&RA guidelines, and FWIW going outside their wheel width range on the narrow end generally results in somewhat more sidewall heating as you drive on them. Steering precision would also suffer a bit, which your car's VDC might not be too happy about.

40 profile tires aren't supposed to have much visible 'bulge' or sidewall curvature to their appearance.


Norm

Thanks for the explanation, I just wanted to avoid the stretched look.
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Old 04-17-2020, 09:15 PM   #8455
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Looooong time lurker...first post! I've read quite a bit of this huge thread for weeks, but could really use some insight.

I have a 2015 WRX that came with 235/45/17, and after 5 years, it is time to change. Long overdue.

My first thought is to go to 18 inch from the OEM 17 inch. This car certainly rides a bit rough on 17 inch wheels and does not have the inverted strut change that came in certain trim levels with OEM 18 inch after the WRX 2015 year. Despite this, it should be fine to make this change to 18s without too much degradation in ride quality, as I don't really mind and kind of like the suspension setup...just don't want it to be really bad to daily.

Second, I plan on keeping the car stock ride height. I've had a super low BRZ before and it is not something I will do with the roads where I live. Additionally, my driveway is as steep as possible and requires a perfect angle to not scrape. And even then it does so super super slightly, however it is seems to be the mudflaps, but will diagnose this further before pulling the trigger on wheels, yet I doubt it is rubbing tires/liners on OEM 17. Still, this is an important consideration for me. (Taking the wrong angle bottoms out and scrapes what I believe to be the aluminum skid plate in the front and flashes a light on the dash....)

Third, tire size. I have looked at going to the OEM 18 at 245/40/18, which at the moment seems to be the best choice. Initially, I was thinking about going with a wider tire since I am buying rims anyways. Something like 255/40/18 or 265/35/18. I've done the tire calculations for size, but it is quite hard to figure out if these will rub at all (remember the driveway) at stock height depending on the offset. Also, I really don't want to sacrifice the drivability or great handling of this car. It is stock minus some cosmetics and a muffler delete, so a super wide tire other than looking nice, could sacrifice handling etc from what I have read here, however that seems mostly related to offset. While a lot of people like the 35ish offset and it does look great, I plan on sticking closer to stock like 42 or 45 to find the balance of looks with performance. I just don't know what tire size to get will all of these considerations in mind....help?

I will get Michelin Pilot Sport A/S 3+ and like the style of 6 spoke rims like Rota Concave Grids or AVID1 AV06 if they fit the selected tire. Possibly in white to match the white paint on the car. Will look pretty great with some of the gloss black vinyl wrapping/accents and red S207 pinstripe. (If anyone has recommendations on rim brands here, send me a DM.)

Thanks!
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Old 04-18-2020, 08:33 AM   #8456
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I think that 255/40's on 18x9 with +45 offset is your best easy choice. You get just a little more ride height from 255/40 being about 0.3" taller than the OE 245/40 (~0.15" more ground clearance), and you're not moving the wheel laterally enough to cause any problems. Here's a plot comparing 255/40-18 on 9", +45 against Subaru's OE 245/40-18 on 8.5", +55. The tire's outer sidewall at sidewall mid-height will be about 15mm closer to flush than Subaru's OE (should be clearly noticeable).



I could re-plot this with 9.5" wide wheels and whatever offset.

265/35 tires would be 0.4" shorter than Subaru's OE 18" setup (~0.2" less ground clearance).


Norm
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Old 04-18-2020, 04:16 PM   #8457
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Originally Posted by Norm Peterson View Post
I think that 255/40's on 18x9 with +45 offset is your best easy choice. You get just a little more ride height from 255/40 being about 0.3" taller than the OE 245/40 (~0.15" more ground clearance), and you're not moving the wheel laterally enough to cause any problems. Here's a plot comparing 255/40-18 on 9", +45 against Subaru's OE 245/40-18 on 8.5", +55. The tire's outer sidewall at sidewall mid-height will be about 15mm closer to flush than Subaru's OE (should be clearly noticeable).



I could re-plot this with 9.5" wide wheels and whatever offset.

265/35 tires would be 0.4" shorter than Subaru's OE 18" setup (~0.2" less ground clearance).


Norm
Thanks for the analysis Norm.

Compared to the 235/45/17, the 255/40/18 9 +45 it looks like a nice choice.
(Other than the Michelin Pilot Sport A/S 3+ only comes with 95Y at that size instead of OEM 97Y, which I guess could be negligible at the weight numbers, not sure how I feel about that.)

When comparing the 235/45/17 to 265/35/18, I saw that the diameter/circumference is identical while gaining 1.1 inchs in width and losing 0.5 inches in sidewall.

That would be what, a 18x9.5 inch rim with a 42 to 45 offset? But, I just can't find people saying how that drives stock.
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Old 04-19-2020, 08:16 AM   #8458
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You have to be a little careful when comparing load index numbers. The A/S 3+ is an SL tire, and the SL table is different from the XL table I'm getting for the OE. The quick and dirty conversion is that an SL tire rates like an XL tire four numbers higher. Until inflation pressures exceed 35 psi, where the XL continues to gain rated load capacity (and the SL tire cannot take credit for inflation past that point).

IOW, a 95SL tire is a match for a 99XL tire up to 35 psi, and I'm guessing that your door sticker calls for something like 33 front/32 rear.

I would expect the 255/40 on 9" to handle just a little more 'crisply', slightly better initial response even in street driving. Section height is about 1/8" shorter than the 235/45-17 but you'd gain 1/2" of ground clearance from the wheel diameter difference. Yes, the 255/40-18 is a little taller and will fill up the wheel well a little more (and take a little out of the tire to fender gap at the top), but it won't be much different from Subaru's 18" option that I plotted up above.

For your change, you're looking at something more like this




Norm
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Old 04-21-2020, 10:47 AM   #8459
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Originally Posted by Raccoon WRX View Post
My first of (hopefully) many posts to come.



After weeks of practically living in this thread, then another couple of weeks picking the perfect set of wheels, I finally pulled the trigger.



Enkei TSR-X (new for 2020) in Gloss Bronze

18x9.5 +38 on Michelin Pilot Sport A/S 3+ in 255/35/18
Stock suspension for now, no rubbing as of yet.











I love how they came out

These look great, Iím thinking of getting these in gloss black. Where did you get them from?
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Old 04-23-2020, 11:26 AM   #8460
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Originally Posted by JeffrWRX View Post
255/35/18 on 18x9.5+35 and fenders are not rolled and no issues. However, I am running GTWorx Bilstein Trophy Cup + RCE Street Plates



Untitled by Jeff Ruhl, on Flickr

Untitled by Jeff Ruhl, on Flickr

Untitled by Jeff Ruhl, on Flickr
What specs? I like that look a lot. Good choice of wheel!
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Old 04-23-2020, 04:28 PM   #8461
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What specs? I like that look a lot. Good choice of wheel!
You just quoted his post with the specs in it...
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Old 04-24-2020, 12:53 AM   #8462
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2018 WRX . Would 18x9.5 et 38 with 255/40 tires on swift springs fit without rolling or pulling fenders? Any input pls. Thank you
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Old 04-24-2020, 03:06 PM   #8463
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would their be much of a ride quality difference going from a 245/40 to a 255/35 on a 18x9+35 wheel?
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Old 04-25-2020, 11:53 AM   #8464
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Originally Posted by PointNShoot24 View Post
would their be much of a ride quality difference going from a 245/40 to a 255/35 on a 18x9+35 wheel?
Mostly subjective. Overall the tire will be undersized from stock. Sidewall is about 3/8" smaller on the 255/35.
Personally I wouldnt do it. A 245 on a 9" wheel is fine.
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Old 04-26-2020, 07:43 AM   #8465
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Default 2015 WRX/STi Aftermarket wheel and tire fitment

Sorry, Wrong spot.

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Old 04-26-2020, 08:56 AM   #8466
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Originally Posted by PointNShoot24 View Post
would their be much of a ride quality difference going from a 245/40 to a 255/35 on a 18x9+35 wheel?
The 255/35 is three load index numbers smaller than a 245/40. While recovering the "lost" load capacity is at least possible via extra inflation pressure (about 37 psi vs OE 33), that's also working in the 'wrong' direction from the standpoint of ride quality and would make the 255/35's naturally firmer ride somewhat more so. If ride quality has much importance to you, the overall result almost certainly isn't likely to be worth it.


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Old 04-26-2020, 08:33 PM   #8467
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bit a newb when it comes to this, just looking for some guidance...

Own a 2017 STI, looking at trying to improve the ride comfort a bit as these trash LA roads are finally taking a toll on my commute.

I understand that downsizing rim and going with a taller tire can help alleviate my concern, but I am trying to figure out what I am supposed to go with.

Ultimately, I would like to keep the same overall tire height to the OEM rim/tire combination. So should I be looking for a 17" rim and a tire size 245/45/17?

Im interested in the Sparco Terras which would be 17x7.5 with a 245/45ZR17 Michellin (either summer or all season). Am I looking in the right direction? Any advice?
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Old 04-26-2020, 11:57 PM   #8468
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Originally Posted by anonymoose87 View Post
bit a newb when it comes to this, just looking for some guidance...

Own a 2017 STI, looking at trying to improve the ride comfort a bit as these trash LA roads are finally taking a toll on my commute.

I understand that downsizing rim and going with a taller tire can help alleviate my concern, but I am trying to figure out what I am supposed to go with.

Ultimately, I would like to keep the same overall tire height to the OEM rim/tire combination. So should I be looking for a 17" rim and a tire size 245/45/17?

Im interested in the Sparco Terras which would be 17x7.5 with a 245/45ZR17 Michellin (either summer or all season). Am I looking in the right direction? Any advice?


Tire size sounds fine for the car but a 7.5" is a bit narrow. Might get a bit of tire bulge with that setup. Do they offer a wider option, stock wheel is 8.5" wide.
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Old 04-27-2020, 08:59 AM   #8469
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7.5" is do-able for 245/45, but it's a min-recommended fitment. 8" is measuring width, so 7.5" would be expected to ride just a little softer . . . and have slightly softer cornering response and steering precision as well.


Norm
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Old 04-27-2020, 10:36 AM   #8470
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Quote:
Originally Posted by Raccoon WRX View Post
My first of (hopefully) many posts to come.



After weeks of practically living in this thread, then another couple of weeks picking the perfect set of wheels, I finally pulled the trigger.



Enkei TSR-X (new for 2020) in Gloss Bronze

18x9.5 +38 on Michelin Pilot Sport A/S 3+ in 255/35/18
Stock suspension for now, no rubbing as of yet.











I love how they came out
I just might pull the trigger on those wheels, how does the ride feel with them?
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Old 04-30-2020, 07:55 PM   #8471
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Originally Posted by dpetro1 View Post
Tire size sounds fine for the car but a 7.5" is a bit narrow. Might get a bit of tire bulge with that setup. Do they offer a wider option, stock wheel is 8.5" wide.
They don't, but thanks for the input.

Im guessing I would have to go with 235 if i were to go with 7.5? or probably look for an 8.5 rim.
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Old 05-01-2020, 08:04 AM   #8472
Norm Peterson
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Originally Posted by anonymoose87 View Post
They don't, but thanks for the input.
Technically, they do. Just not by enough to tell just by looking at them.


Quote:
Im guessing I would have to go with 235 if i were to go with 7.5? or probably look for an 8.5 rim.
Better than 245/45 on 7.5", but for a 'sport sedan', I'd still rather see 245/45's on 8" wide wheels.

Either size is enough bigger than 245/35-19 that you could reduce the inflation pressure a little without compromising any rated load considerations (this is a legitimate thing to do, and I have the tables to work out how much this inflation pressure change would amount to).


Norm

Last edited by Norm Peterson; 05-07-2020 at 07:21 AM.
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Old 05-03-2020, 10:56 PM   #8473
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Originally Posted by Norm Peterson View Post
Technically, they do. Just not by enough to tell just by looking at them.



Better than 245/45 on 7.5", but for a 'sport sedan', I'd still rather see 245/45's on 8" wide wheels.

Either size is enough bigger than 235/35-19 that you could reduce the inflation pressure a little without compromising any rated load considerations (this is a legitimate thing to do, and I have the tables to work out how much this inflation pressure change would amount to).


Norm

thanks!
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Old 05-06-2020, 11:37 PM   #8474
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18x9.5 +38 w/ 275/35/18s


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Old 05-07-2020, 07:24 AM   #8475
Norm Peterson
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Originally Posted by anonymoose87 View Post
thanks!
Sorry for not catching a typo.

"Either size is enough bigger than 245/35-19 that you could reduce the inflation pressure a little"

It makes a difference.


Norm
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