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Old 03-03-2021, 04:04 PM   #1
Mach V Dan
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Default Extra-Wide Subaru Wheels

For you motorsports-y types, we had Titan 7 make us some forged 18x10.5" wheels intended for extra-wide Subaru fitment. We have had several customers ask for something like this over the past few years.







With 285/30R18 tires:







This is obviously going to need fender cutting and/or flares.

If you are interested, you can find pricing and purchase the wheels HERE.

Dan
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Old 03-05-2021, 02:57 AM   #2
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Those wheels look AWESOME!!!
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Old 03-05-2021, 03:13 AM   #3
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Phatties
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Old 03-05-2021, 12:41 PM   #4
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What is the widest 18" tire size to fit without rubbing issues or fender mods?
Rim size?
Thanks
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Old 03-05-2021, 03:48 PM   #5
Mach V Dan
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Quote:
Originally Posted by george3 View Post
What is the widest 18" tire size to fit without rubbing issues or fender mods?
Rim size?
You mean with this specific wheel? I'm not sure there is any tire size that is going to fit without fender mods.

If you mean in general? On the 2015+ WRX/STI, we run fairly high-offset (+40-42 range) 18x9.5" wheels with 265/35R18 without any rubbing.

Dan
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Old 03-05-2021, 06:38 PM   #6
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Thanks for the info Dan. Which tire do you recommend for the track in the 265/35R18 size? In the past, I've used Nitto, Kumho, etc. Please PM me a price of 4 in the Black finish.
Thanks................. George
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Old 03-08-2021, 11:30 AM   #7
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Thanks for the info Dan. Which tire do you recommend for the track in the 265/35R18 size? In the past, I've used Nitto, Kumho, etc. Please PM me a price of 4 in the Black finish.
Thanks................. George
To be clear, I would NOT run these 10.5" wide wheels with a 265 tire. It would be very stretched. If you want to run only a 265 width, use a 9.5" wide wheel, of which we stock many. Might I suggest our 18x9.5" Mach V Wicked Awesome.

Which tire to use at the track is not something I can answer without more information. What is your budget? How modified is the car? What kind of events will you be running? Is the car driven to the track or trailered? What conditions will you be driving in?

If you still want the wheels I spoke about above you can find them here:

Mach V x Titan 7 18x10.5" wheels -- click me!

Click the link for pricing and ordering.

Dan
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Old 03-17-2021, 10:38 AM   #8
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Quote:
Originally Posted by Mach V Dan View Post
To be clear, I would NOT run these 10.5" wide wheels with a 265 tire. It would be very stretched.
Agreed. Though 265/35 is still T&RA-approved for fitment to 10.5" wide wheels.



Personally, for 265-wide tires I'd be looking for 10" wide wheels.

265/xx on 9.5" wide wheels feels a little softer and less precise than a max-recommended fitment for a tire of similar diameter and identical tread width. Same make and model tires (MPSS). Same suspension/damper tuning.


Norm
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Old 03-17-2021, 02:45 PM   #9
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Quote:
Originally Posted by Norm Peterson View Post
Agreed. Though 265/35 is still T&RA-approved for fitment to 10.5" wide wheels.



Personally, for 265-wide tires I'd be looking for 10" wide wheels.

265/xx on 9.5" wide wheels feels a little softer and less precise than a max-recommended fitment for a tire of similar diameter and identical tread width. Same make and model tires (MPSS). Same suspension/damper tuning.


Norm
Fender mods would be needed for the 10" wide wheel though no? on stock suspension at least I would think.

I've got some Weds 18x9.5 +45 and plan on running 265/35 on stock suspension. Would've run 255 but wanted to protect the lip of the wheel more and go for the "meaty" look
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Old 03-18-2021, 08:09 AM   #10
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Originally Posted by standardtranny View Post
Fender mods would be needed for the 10" wide wheel though no? on stock suspension at least I would think.
More than likely. I haven't measured my WRX to see what might be involved so I'm really just commenting on tire to wheel matters. Much past that gets too deep into appearance preferences for me.


Norm
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Old 03-08-2021, 05:24 PM   #11
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Cool stuff.

I can feel all of us back in the aughts drooling.

Just call me Vicarious Lee.
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Old 03-17-2021, 02:41 PM   #12
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What tire size is going to be super dependent on tire selection if you're in the 200TW track tire realm.

The 255/35/18 RT660 looks to be a great fit on a 10.5" wheel.
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Old 03-17-2021, 03:47 PM   #13
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What tire size is going to be super dependent on tire selection if you're in the 200TW track tire realm.

The 255/35/18 RT660 looks to be a great fit on a 10.5" wheel.
A 255 of any brand on a 10.5 wheel? You are kidding right? So sick of the mecky poke stretched tire thing that has taken over the subie world. ...I wish these people stuck with Honda's and VW's.



Signed,
18x10 3 Piece HRE's wrapped in a proper set of 285/35 Michelin Pilots.
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Old 03-18-2021, 12:03 AM   #14
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Originally Posted by umscooby View Post
A 255 of any brand on a 10.5 wheel? You are kidding right? So sick of the mecky poke stretched tire thing that has taken over the subie world. ...I wish these people stuck with Honda's and VW's.



Signed,
18x10 3 Piece HRE's wrapped in a proper set of 285/35 Michelin Pilots.
You're a moron

It's obvious who actually uses their cars for motorsports vs hard parking. A 255 Falken RT660 would be fine on a 10.5. I just mounted some RT660's in 225/45/15 on 15x9s and they look great. Hundreds of people who actually compete will show you the same. Can guarantee motorsports tires run wider than most Michelins, and 99% aren't going to be running wheels as heavy as HRE's
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Old 03-18-2021, 08:26 AM   #15
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You're a moron

It's obvious who actually uses their cars for motorsports vs hard parking. A 255 Falken RT660 would be fine on a 10.5.
And that 255 on 10.5" is getting out there with what the import car show crowd does for shock value.

I get the idea of stretching the beads out to increase a couple of a tire's stiffness values, but there's a reasonable limit. I've mounted a few tires on wheels half an inch wider than "max recommended", but those were taller profile tires where you had enough sidewall height to distribute the extra stretch over.

Just so you know, I'm running 285/35 tires on 18x11 wheels on the other car for its track time and some street driving. If I went to 305-wide tires, I'd want another half inch of rim width.


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Old 03-18-2021, 09:33 AM   #16
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And that 255 on 10.5" is getting out there with what the import car show crowd does for shock value.

I get the idea of stretching the beads out to increase a couple of a tire's stiffness values, but there's a reasonable limit. I've mounted a few tires on wheels half an inch wider than "max recommended", but those were taller profile tires where you had enough sidewall height to distribute the extra stretch over.

Just so you know, I'm running 285/35 tires on 18x11 wheels on the other car for its track time and some street driving. If I went to 305-wide tires, I'd want another half inch of rim width.


Norm
You're missing the point. Not all tires are made the same. Here is a 255 Falken RT660 on a 10.5 wide wheel. It's not stretched in anyway past a reasonable limit. If I were saying mount some Tigerpaw special in that size on a 10.5 it'd definitely be stance nation.

Untitled by Justin Tilus, on Flickr

Untitled by Justin Tilus, on Flickr

Untitled by Justin Tilus, on Flickr

Tire width is relative, and there's plenty of manufacturers that stamp a number on the sidewall that's less than what it really is. Until you see it with your own eyes and see the results it seems prudent to not judge it.
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Old 03-18-2021, 12:06 AM   #17
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For the wheel, I'm glad there's another option on the market, but if you're doing fender mods there's plenty of 11's and 12's out there now. 200tw tires and the classes that require them usually don't allow for much fender modification, so once you cut things it seems to make more sense to go a good bit wider. I was running 11's back in 2014 and 12's in 2017. Those two sizes make more sense given the motorsports market these days.

That being said, 10.5 will capture more canyon runners or similar, and that might be a bigger market.
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Old 03-18-2021, 01:17 PM   #18
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^^^ there appears to be a fairly substantial rub strip on the 660 that makes the fitment look better than it really is - regardless of how it looks, it's still half an inch outside T&RA guidelines.

For a little math . . . the RT660 in 255/35-18 has a 10.4" section width when mounted on its 9" wide "measuring" wheel. Stretch the wheel out to 10.5" and that 10.4" grows approximately 0.6" for an as-mounted section width of 11.0". That's half an inch narrower than the outside to outside width of the wheel (10.5" + 2 x 0.5" for the flange thicknesses). IOW, the 'tire looking to be flush with the outer face of the rim' appearance is deceiving. Those are actual dimensions from Tire Rack's specs page for the RT660, not numbers calculated from the nominal tire size.

I get that you can get away with being outside T&RA guidelines for autocross where speeds and risks are both low. I've done it, too, and I'll run max-recommended fitments anywhere without second thought. Daily-driving on the street included.

But we both know that there's going to be people reading this thread looking to do the exact same fitment for their street-only car because they saw it on the internet. Vendor Dan is perhaps even more aware of this, as his 9.5" recommendation is slightly more conservative than mine.


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Old 03-18-2021, 02:53 PM   #19
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While I understand it's outside the mandated recommended wheel size (that doesn't take into account tires outside the stamped sizes), the point is people also run the Yokohama A052, BFG Rival, etc on wheels wider than guidelines and have excellent results. I get how tire widths work too, and have run 205's on 9's on track (as in actual time trial) with very good results.

As this is posted in the motorsports forum I find it amusing people with no experience seem to want to poo poo setups. In the regular wheel and tire forum? Sure, flame away.

Flip side is I run 335's on 12's on the autox car because Hoosiers don't mind less support. 200tw tires tend to want more support or a slight stretch. If you look at bigger factory wheel sizes and OEM stuff you'll see the same slight stretch because that's where the tire gives the best performance.
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Old 03-18-2021, 04:18 PM   #20
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I'd say there is a balance between width, contact patch, and stiffness. I still would argue that a 255 MOTORSPORTS tire on 10.5" wheels is on the side of sacrificing grip and gaining very little too nothing with the extra stiffness. A 265 seems like it would be better based on what I see in your photos. But I'm just a moron who is happy to be educated and fire up you professional race car drivers.

Last edited by umscooby; 03-18-2021 at 05:23 PM.
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Old 03-20-2021, 11:47 AM   #21
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Originally Posted by subydude View Post
While I understand it's outside the mandated recommended wheel size (that doesn't take into account tires outside the stamped sizes), the point is people also run the Yokohama A052, BFG Rival, etc on wheels wider than guidelines and have excellent results. I get how tire widths work too, and have run 205's on 9's on track (as in actual time trial) with very good results.
At some point, it's time to move up to a little more tire. Yeah, I get it if you're running in a class that limits tire size (either directly or indirectly) but leaves wheel width 'open'.


Quote:
As this is posted in the motorsports forum I find it amusing people with no experience seem to want to poo poo setups. In the regular wheel and tire forum? Sure, flame away.
No flame, more like a caution that that much stretch probably isn't going to be right for everybody. Actually, I've got a bit of autocrossing in my background and am an intermediate-level HPDE driver who has been placed in advanced/instructor run groups a few times.


Quote:
Flip side is I run 335's on 12's on the autox car because Hoosiers don't mind less support. 200tw tires tend to want more support or a slight stretch. If you look at bigger factory wheel sizes and OEM stuff you'll see the same slight stretch because that's where the tire gives the best performance.
I'm honestly surprised that you'd ever go with a min-recommended wheel width.


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Old 03-22-2021, 09:51 AM   #22
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At some point, it's time to move up to a little more tire. Yeah, I get it if you're running in a class that limits tire size (either directly or indirectly) but leaves wheel width 'open'.
When it's an A052 that 205 is .1" difference on a 9 vs a 225 BFG Rival. And in 15" sizes there aren't tons of options. You're still missing the point that not all tires are stamped with numbers that show how wide they are, and the "recommended wheel width" on sites like TireRack are mandated sizes, not what the tire actually wants.


Quote:
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No flame, more like a caution that that much stretch probably isn't going to be right for everybody. Actually, I've got a bit of autocrossing in my background and am an intermediate-level HPDE driver who has been placed in advanced/instructor run groups a few times.
You're right about that bit. Someone buying 10.5's and mounting some Indy 500's or Michelin PS4S or something will want to go to a 265-285ish section tire, because those tires don't run wide. If you tried running a 285 A052 or Falken RT660 it'd be pinched.

Regarding your experience, it was already obvious you are someone who enjoys casual motorsports, but doesn't really compete more than the occasional weekend a few times a year. Nothing wrong with that, but it's a very different world vs running 15-25 events a year for almost 15 years now.

Quote:
Originally Posted by Norm Peterson View Post
I'm honestly surprised that you'd ever go with a min-recommended wheel width.


Norm
As stated, the car with 18x12's is an autox car. The wider the car, the further it has to go around cones. I don't have any more inbound clearance so 13's would just make the car 2" wider total and I don't want that. I already stated how to compensate, so I'm not sure why you're surprised other than you're just not used to someone doing something outside the box.

Personally, this conversation has gone on long enough. 10.5's on a street (non-motorsports) tire can have a 265-305 depending on how narrow the tire actually measures. People who know what they're doing can mount 245 (motorsport) tires without issue.
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Old 03-18-2021, 04:25 PM   #23
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For reference of what Subydude is getting at. Here are 255/40r17 RE71Rs on 17x9s. Usually considered somewhere between a square and a pinched setup.



Here you can see the deflection. This is why people tend towards the stretched setups. It's probably a bit exaggerated due to the taller 17" sidewalls as well, but the street tires do fold over a bit.



I can't say I learned my lesson as I put 275/35/18 on 18x9.5s. To me it made more sense to get an increase in contact patch, but I obviously haven't tested many different setups myself, and these wheels are narrow compared to what's been mentioned previously in the thread. Our first event last weekend was wet so I didn't really get to lean on it yet. To me a 275 or 285 doesn't sound unreasonable on a 10.5" wheel, but I'm no expert

Last edited by T-37; 03-18-2021 at 04:31 PM.
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Old 03-18-2021, 04:50 PM   #24
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Originally Posted by T-37 View Post
For reference of what Subydude is getting at. Here are 255/40r17 RE71Rs on 17x9s. Usually considered somewhere between a square and a pinched setup.



Here you can see the deflection. This is why people tend towards the stretched setups. It's probably a bit exaggerated due to the taller 17" sidewalls as well, but the street tires do fold over a bit.



I can't say I learned my lesson as I put 275/35/18 on 18x9.5s. To me it made more sense to get an increase in contact patch, but I obviously haven't tested many different setups myself, and these wheels are narrow compared to what's been mentioned previously in the thread. Our first event last weekend was wet so I didn't really get to lean on it yet. To me a 275 or 285 doesn't sound unreasonable on a 10.5" wheel, but I'm no expert
I think it depends on tire for what's reasonable. A 71R? Sure, that size is probably ok but you will need to run more negative camber to compensate for sidewall flex. A Falken or Yokohama? Nah, gonna be too big and it'll wear and feel pretty poor in comparison to a smaller size.

As stated, 200tw likes being supported more which to the uninitiated looks like a bit of stretch. Excessive stretch for stance is definitely dumb, but that's like a 215 tigerpaw on a 10 or something.

There is some merit to contact patch vs sidewall support, but the trade off varies. When you support a tire it gives better feedback and the inputs feel more "crisp" which can lead to finer placement of a car, quicker steering, better tire wear, etc. All of this through corners though. When you go for contact patch and don't compensate with enough negative camber to keep that patch working on the ground while the car has rolled through all the weight transfer, then it's pointless and you're only increasing straight line traction.

The devil is always in the details. For example, on the autox car the 335's I run on 12's would be better on 13's, but I've run out of room to set the wheel inboard and don't want to make my car 2" wider. I also have enough camber and other fixes in place so the contact patch is optimized and the setup works. Theoretically 315's on a 12 would be "better" but because I'm working inside a rule set for a specific motorsports environment I don't support the tire in the optimal way. Conversely, on the track car I run a well supported 200tw tire. Still have good camber and such, but less because the car doesn't have ABS and I need to maintain brake capacity. The supported tire combined with reasonable camber helps wear, traction, feedback, etc.

Different strokes, lots of details, 100's of ways to get to the goal.
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Old 03-19-2021, 04:12 AM   #25
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For reference of what Subydude is getting at. Here are 255/40r17 RE71Rs on 17x9s. Usually considered somewhere between a square and a pinched setup.


what wheels are those?
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