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      07-15-2012, 10:40 PM   #23
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What size are you running up front 255/35?
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      07-16-2012, 11:25 AM   #24
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Quote:
Originally Posted by 1&done View Post
What size are you running up front 255/35?
Yeah, I'm at 255/35 in the front, but don't use this as a great reference point.

I have the ER widebody kit on my car and can fit up to 285/30-18 on the front now, I just don't have the correct offset wheels to do so. Ideally, without modifying the body you can fit 255/35-18's on the front without m3 control arms (hd bushings ok) and you can get 285's in the back with no fit issues.
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      07-17-2012, 01:37 PM   #25
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IC. I like the wide body kit. Was considering it but wasn't sure about the rear not matching the vendors 100%. Would love to see more pics
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      01-23-2017, 04:03 PM   #26
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At the end, all work out, anything rubbed?
Did you need to roll fenders?
Quote:
Originally Posted by fboutlaw View Post
So rarely do I get to use this but...

Boom Shaka Laka!

285/35-18 Yokohama ADVAN NEOVA's on Apex ARC-8's


Clearance inside:


To Outside... I can't get a good image because it's very tight.


Rubber!


Conclusion:
They work, but I haven't maxed out the suspension or pulled the springs to check clearance all the way up. If there's going to be any issue, it's going to be on the outside, which can most likely be remedied with a fender roll. To keep the clearances where they're at, I'm going to replace the links with M3 variants so that there's no bushing play and check clearances while the suspension is apart in the next few weeks.

So far... slam dunk! And they ride soooo much better than the PSS's
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      09-23-2018, 06:33 PM   #27
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Quote:
Originally Posted by fboutlaw View Post
So rarely do I get to use this but...

Boom Shaka Laka!

285/35-18 Yokohama ADVAN NEOVA's on Apex ARC-8's


Clearance inside:


To Outside... I can't get a good image because it's very tight.


Rubber!


Conclusion:
They work, but I haven't maxed out the suspension or pulled the springs to check clearance all the way up. If there's going to be any issue, it's going to be on the outside, which can most likely be remedied with a fender roll. To keep the clearances where they're at, I'm going to replace the links with M3 variants so that there's no bushing play and check clearances while the suspension is apart in the next few weeks.

So far... slam dunk! And they ride soooo much better than the PSS's
What offset were the apex rims? They used to offer -62 and now they offer -58. I'm curious to try and do something similar and squeeze the 295/30R18 in there, looks like it could fit with a fender roll and slight pull maybe.
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      10-01-2018, 11:33 AM   #28
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for info I got 285 30 18 and 255 35 18 ad08r on my car

The 255 runs wide but the 285 runs narrow

if you put both side by side the 285 looks more a 265 compared to the 255

but the 295 30 19 ad08r runs wide more like 305

the same tire profile can run wide or narrow depending on the size.
this is confirmed by tire-rack table where all width in inch are marked
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      12-21-2018, 10:55 AM   #29
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Quote:
Originally Posted by marconi118 View Post
for info I got 285 30 18 and 255 35 18 ad08r on my car

The 255 runs wide but the 285 runs narrow

if you put both side by side the 285 looks more a 265 compared to the 255
Looks can be deceiving... but it depends on what the basis was for your measurements.

The following contains actual measurements taken on various wheel widths, not tyre manufacturers or resellers specifications, although, they're usually within a few millimetres (1/8") of each other. I prefer actual measurements as that is what I need to use to determine appropriate extreme wheel and tyre fitment on my car.

The section width for an AD08R 285/30/18 measures 288mm (11.34") on a 10" wheel, so it's not narrow. The measured rim for an AD08R 285/30/18 is 10".
The AD08R 285/30/18 on a narrower 9.5" wheel is 283mm.

The section width for an AD08R 265/35/18 measures 263mm, 270mm (10.63") and 278mm on a 9", 9.5" and 10" wheel, respectively. The measured rim for the AD08R 265/35 is 9.5". So the 265/35 on a 10" wheel is quite wide but it has a minuscule stretch since it's on a 10" wheel, which is the largest recommended wheel width for that 265 tyre.

When comparing the 265 and 285 on the same wheel, which I presume you did, there is a 10-13mm difference, which is relatively noticeable, which should be the case since one of the tyres being compared is being either stretched or pinched.
When comparing these two tyres on their measured rim, i.e. as they were designed, then there is a 18mm difference, which is certainly noticeable.

The section width for an AD08R 255/35/18 measures 259mm (10.20") and 265mm on a 9" and 9.5" wheel, respectively. The measured rim for the AD08R 255/35/18 is 9".

Again, an as-designed comparison of the 255, 265 and 285 on their respective measured rim shows a difference of 11mm (255-265), 18mm (265-285) and 29mm (255-285), which is a true reflection of the width differences, while a comparison between the three tyres on an in-common approved fitment 9.5" width wheel naturally shows a closer difference of 5mm (255-265), 13mm (265-285) and 18mm (255-285), due to the 255 being stretched and the 285 being pinched, but I don't think it's so little of a difference to say the 285 looks like a 265.

So these three AD08R tyres all run wide to different degrees, with the 265 fairing the best resulting in it being slightly closer to the 285, but it's still marginal at best.

So, as to whether the tyres look the same size, as I mentioned, it depends on what your metric is. I prefer using each tyre's specific measured rim or each tyre's specific measured rim + 0.5".
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      12-22-2018, 10:26 AM   #30
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Hmm....

Thinking of giving the 285/30 a try with my EC7. Don't like how much taller my 265/35 are than the proper 24.8" diameter.

Really wish Michelin would offer the PS4S in this size. Contacted Michelin, no plans I the works to start offering it.

Looks like I will give the Continental a try.
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      12-23-2018, 06:08 AM   #31
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I only use AD08Rs on the street, which is why I have all those measurements above available. If you're looking to use AD08Rs then my measurements would be a good indication of likely section width but always double check. You should be around 283mm with an AD08R on an EC-7 18x9.5.

I'm guessing you'll be using the et58 offset. I used an effective et55 offset on an 18x10, which had a 288mm section width, so your inner clearance (with respect to the tyre) would increase by 0.5mm (practically the same), while the outside (guard/fender) clearance would increase by 5.5mm - you'll also have additional clearance to the wheel itself, i.e. 3.3mm inside and 9.4mm outside. You just need to make sure that you perform sufficient guard/fender lip modifications and consider ride height (raising if necessary) to allow fitment of a tyre that wide. If you needed additional clearance on the inside, and you still had ample clearance of the outside, then you could use a 3mm spacer. I don't like using spacers, especially on the track, but it can be a useful tool if it's difficult to come by custom offset wheels.

I also prefer the shorter 628mm OD tyres but have also run 635mm OD tyres (255/35/18 and 295/30/18) and 643mm OD tyres (265/35/18) without any issues. I don't think OD is an issue (at least not on my car) until it is around 650mm, which is when tyre section width needs to be decreased to ensure rubbing on the fuel filler tube doesn't occur.
Every car is different (mine took a lot of time, effort and money to fit), though, so take your baseline measurements and work from there.

The Michelin PS4S and (I presume an equivalent) Continental are Max performance tyres, whereas, I only use an Extreme performance tyre at a minimum on the road e.g. AD08R (I may look at the RE-71R next) - I would also run a Pilot Sport Cup 2 (or the A052 in 265/35/18 if I was in the US) on the street - there's no need for anything less where I live.
On the track, it's either semi-slick (R-comp) or full slick.
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      12-23-2018, 08:58 AM   #32
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Quote:
Originally Posted by 135 View Post
I only use AD08Rs on the street, which is why I have all those measurements above available. If you're looking to use AD08Rs then my measurements would be a good indication of likely section width but always double check. You should be around 283mm with an AD08R on an EC-7 18x9.5.

I'm guessing you'll be using the et58 offset. I used an effective et55 offset on an 18x10, which had a 288mm section width, so your inner clearance (with respect to the tyre) would increase by 0.5mm (practically the same), while the outside (guard/fender) clearance would increase by 5.5mm - you'll also have additional clearance to the wheel itself, i.e. 3.3mm inside and 9.4mm outside. You just need to make sure that you perform sufficient guard/fender lip modifications and consider ride height (raising if necessary) to allow fitment of a tyre that wide. If you needed additional clearance on the inside, and you still had ample clearance of the outside, then you could use a 3mm spacer. I don't like using spacers, especially on the track, but it can be a useful tool if it's difficult to come by custom offset wheels.

I also prefer the shorter 628mm OD tyres but have also run 635mm OD tyres (265/35/18 and 295/30/18) without any issues. I don't think OD is an issue (at least not on my car) until it is around 650mm, which is when tyre section width needs to be decreased to ensure rubbing on the fuel filler tube doesn't occur.
Every car is different (mine took a lot of time, effort and money to fit), though, so take your baseline measurements and work from there.

The Michelin PS4S and (I presume an equivalent) Continental are Max performance tyres, whereas, I only use an Extreme performance tyre at a minimum on the road e.g. AD08R (I may look at the RE-71R next) - I would also run a Pilot Sport Cup 2 (or the A052 in 265/35/18 if I was in the US) on the street - there's no need for anything less where I live.
On the track, it's either semi-slick (R-comp) or full slick.
Yes, running the +58, 18x9.5 in the rear. Ride height is stock. With the MPSS in a 265/35/18, I get a little rub on the outside fender liners due to the larger diameter, when going over large dips on B roads at speed. It rubs on the outside diameter, not the sides.

Current Tire specs:
Diameter 25.3" (643 mm)
Section Width on 9.5" rim: 10.7" (272 mm)


Also looking to go with a much stiffer rear spring (Ohlins with custom Swift springs), but keep it near stock height, or at max 10-15mm lower.

I still have the ability to add a little more rear camber. Currently at -2.0 left and right.
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      12-24-2018, 11:15 AM   #33
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Thanks, for keeping me on my toes. I had a typo in my previous reply regarding OD tyre sizes, which I've corrected to reflect 635mm OD tyres (255/35/18 and 295/30/18) and 643mm OD tyres (265/35/18).

I removed my guard/fender liners a long time ago but that was more so due to the modifications on the lip, for running the wider but lower OD 285/30/18, not being able to seat the liner.

From what I recall, commentary was that the MPSS sizes tend towards a square shouldered tyre (although some were more rounded), so it's more likely that it could rub under certain conditions, as you mentioned.

When you say "it rubs on the outside diameter, not the sides" do you mean at the centre of the tread or off towards/at the edge of the tread?
If at centre, then that would mean rubbing no matter what 265/35/18 tyre you used.
If at the edge, then that could mean the squarer shoulder of the MPSS could be the contributing factor. A rounded shoulder tyre (I recall Hankook Ventus V12 Evo), determined by tread width : section width ratio, doesn't have the issue with rubbing on the OD towards the edge of the tread but, then again, they just don't look as meaty and menacing on the rear. But you also need 285s to amplify that.
I usually regard around 90% as rounded shoulder and around 95% as square. The MPSS were somewhere in the middle but sometimes closer to being classed as rounded, while, the AD08Rs at 97-98% are some of the most square shouldered tyres I have come across.

Changing ride height and camber are going to affect your clearance again. As I found out, it's literally a game of millimetres.
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      01-04-2019, 11:08 AM   #34
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Good discussion. Sorry as I'm sure it's mentioned here, but what wheels are you using and what did you do to your rear fender lips?


Quote:
Originally Posted by 135 View Post
Thanks, for keeping me on my toes. I had a typo in my previous reply regarding OD tyre sizes, which I've corrected to reflect 635mm OD tyres (255/35/18 and 295/30/18) and 643mm OD tyres (265/35/18).

I removed my guard/fender liners a long time ago but that was more so due to the modifications on the lip, for running the wider but lower OD 285/30/18, not being able to seat the liner.

From what I recall, commentary was that the MPSS sizes tend towards a square shouldered tyre (although some were more rounded), so it's more likely that it could rub under certain conditions, as you mentioned.

When you say "it rubs on the outside diameter, not the sides" do you mean at the centre of the tread or off towards/at the edge of the tread?
If at centre, then that would mean rubbing no matter what 265/35/18 tyre you used.
If at the edge, then that could mean the squarer shoulder of the MPSS could be the contributing factor. A rounded shoulder tyre (I recall Hankook Ventus V12 Evo), determined by tread width : section width ratio, doesn't have the issue with rubbing on the OD towards the edge of the tread but, then again, they just don't look as meaty and menacing on the rear. But you also need 285s to amplify that.
I usually regard around 90% as rounded shoulder and around 95% as square. The MPSS were somewhere in the middle but sometimes closer to being classed as rounded, while, the AD08Rs at 97-98% are some of the most square shouldered tyres I have come across.

Changing ride height and camber are going to affect your clearance again. As I found out, it's literally a game of millimetres.
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      01-07-2019, 07:37 AM   #35
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18x10, effective offset et55, but they're only available locally - you're best option is something like the Apex EC-7 18x9.5 et58 or a wheel that you can get in a custom offset to suit your requirements.

Regarding the rear guard lips, all the sealant was removed, which took a whole day per side, and then the guard lips were cut, prepped, sprayed, rolled and pulled and the guard liners were removed.

Also, over the years, the rear camber has ranged between -2.0° and -2.7°, with 0 toe.
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      01-07-2019, 05:08 PM   #36
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Quote:
Originally Posted by 135 View Post
18x10, effective offset et55, but they're only available locally - you're best option is something like the Apex EC-7 18x9.5 et58 or a wheel that you can get in a custom offset to suit your requirements.

Regarding the rear guard lips, all the sealant was removed, which took a whole day per side, and then the guard lips were cut, prepped, sprayed, rolled and pulled and the guard liners were removed.

Also, over the years, the rear camber has ranged between -2.0 and -2.7, with 0 toe.
That's awesome. I might experiment and try a 18x10.5 et 50-55 to fit a 295 back there. I'm thinking custom forgestars as they are not too expensive for a custom offset.
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      01-18-2019, 05:47 AM   #37
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Quote:
Originally Posted by gmagnus7 View Post
Quote:
Originally Posted by 135 View Post
18x10, effective offset et55, but they're only available locally - you're best option is something like the Apex EC-7 18x9.5 et58 or a wheel that you can get in a custom offset to suit your requirements.

Regarding the rear guard lips, all the sealant was removed, which took a whole day per side, and then the guard lips were cut, prepped, sprayed, rolled and pulled and the guard liners were removed.

Also, over the years, the rear camber has ranged between -2.0° and -2.7°, with 0 toe.
That's awesome. I might experiment and try a 18x10.5 et 50-55 to fit a 295 back there. I'm thinking custom forgestars as they are not too expensive for a custom offset.
For a year now, I've been contemplating a rear 18x10.5, more so just to maintain the OE 1" F/R difference, but I need to take fresh measurements at different camber settings to confirm what will fit.

Previous measurements indicate an effective ET55-60 would be required on my car to fit a 295mm section width tyre - a particular tyre on a 10.5" wide wheel would usually have a 5mm wider section width compared to the same tyre on a 10" wide wheel, which is why it's just easier to stay with a 10" wide wheel - the tyre's section width stays within a safer range, even for wide and square tyres.

I wouldn't recommend anyone buying wheels in these specs without first carefully measuring up on their car - it's certainly an extreme fitment.

Forgestar seem like a good option, especially for custom specs, but I've read about a number of complaints regarding the time it takes Forgestar to deliver from the date of order.
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