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[RealityDesign]

Quick question for you tire/wheel fitment gurus...

I currently have a set of Breyton GTS-R's from several years ago. They are the original staggered fitment, I believe 18x7.5 +45mm and 18x8.5 +48mm. I'm also running KW Variant 2's, if it matters. I'd like to order another set of GTS-R's, but would probably go for 18x8.5 all around to reduce understeer.

I was looking on tire rack today, and noticed there is the matte grey finish WITHOUT the red stripe available in 18x8.5 + 37mm. I know a lot of guys run 8-10mm spacers anyway, so it seemed like 18x8.5 + 37mm would fit (since it's basically the same as running an 11mm spacer), but I wanted to get some input. As for tires, I was thinking about just getting four 245x40x18 Dunlop Z1 Star Specs.

So, will 18x8.5 +37mm Breyton GTS-R's with 245x40x18 Dunlop Z1SS's fit? If not, will they fit with a minor fender roll? I don't want to pull my fenders (been there, dont that), but if a minor roll will do the trick, that's fine.

If they just won't fit at all, will the same tires fit on the 18x8.5 +48mm?

Right now it seems like there's tons of room, but I only have 245x35x18 Yoko S-drives in the rear on the +48mm GTS-R's, so it's hard to say what the significantly wider 245 SS's and another 11mm of offset would do. On the 48mm offset, do people ever have issues with rubbing on the inside/strut with wider tires? That's another variable I don't even know if I have to worry about. If I'm just completely off, feel free to suggest a different breyton wheel size or dunlop tire size that I haven't thought of yet...

Thanks!

[onefastman]

Would like to know as well. Front would be really pushing it with out camber

[RealityDesign]

Also worth noting, the section width for the 245x40x18 Dunlop Z1SS's as well as the Bridgestone RE11's is 9.8". The section width of my existing tire (245x35x18 Yoko S-Drive) is 9.7". In other words, we're talking about a negligible difference in width (~3mm).

Although it seems like my problems are going to arise in the front more so than the rear just looking the numbers.

Rear goes from 8.5" + 48mm to 8.5" + 37mm = 11mm further out.
Front goes from 7.5" + 45mm to 8.5" + 37mm = 9mm + 12mm (~half inch more due to 1 inch wider wheel) = 21mm further out.

I don't know if my poor front fenders can really deal with another 21mm. I could always go with slightly narrower tires in the front, like a 225 or 235, which would just barely "stretch" them and maybe give me enough wiggle room. Slightly better steering response with a 225 or 235 on an 8.5" wheel anyway...hmmmm.

Looking forward to any input you guys have.

EDIT: Ouch...just went to the garage and measured a few things, and it looks like I have 10mm or so of wiggle room right now. 15mm maybe if I roll the fenders. Either way, there is no way 21mm is going to make it in there. The rears will probably barely fit, but I don't think the fronts have a chance.

The ones with the grey stripe are 18x8.5 + 48mm, which would be 9mm further out than now (in the front), which is easily doable. Even then, not sure how the 245's will work out in front, but it should be close enough to make it work. I don't really want to have to paint that stupid red stripe though .

[Eddy@ApexWheels]

I only read the bolded text.

Simple answer, a 245/40/18 is too tall. I've had a customer try that very same star spec tire. They mounted it, it did not fit, and immediately had to remove and return the tire. It touches the lower spring perch because it's so tall. it doesn't matter what offset the wheel is, the tire is just too tall.

You'd have to shoot for the 255/35/18 front and add a lot of camber and roll the front fenders.

even a 245/35/18 front will need camber plates. And even a 235/40/18 will be aggressive at that offset.

[RealityDesign]

Originally Posted by paintpro21

I only read the bolded text.

Simple answer, a 245/40/18 is too tall.

You'd have to shoot for the 255/35/18 front and add a lot of camber and roll the front fenders.

even a 245/35/18 front will need camber plates. And even a 235/40/18 will be aggressive at that offset.

Stock overall diameter is 25.2", the 245x40x18 is 25.7". That is definitely too tall, thanks for pointing that out

What are your thoughts on running:

235x40x18 (25.4" overall diameter) front
255x35x18 (25.0" overall diameter) rear
18x8.5 +37mm all the way around.

Seems kind of weird to run 0.4" taller in the front than rear.

The other option is:

225x40x18 (25.1" overall diameter) on 18x8 +34mm front
255x35x18 (25.0" overall diameter) on 18x8.5 +37mm rear

Or lastly, and possibly the best option:

225x40x18 (25.1" overall diameter) front
255x35x18 (25.0" overall diameter) rear
18x8.5 +37mm all the way around.

I've run 225's on 8.5's in the past and I have to say the slightly-stretched tire does improve steering response.

Regardless of the tire, will 18x8.5 +37mm fit in the front anyway?

[Eddy@ApexWheels]

none of the 3 options you listed will work. You cannot run 255/35/18 or even 245/35/18 on the rear if the offset is et37.

You can get 245/35/18 and 255/35/18 to fit up front with that offset, but to have an 8.5" square setup, you'd have to run the higher offset wheels in the rear (so you can't rotate, but they are functionally the same.

As previously mentioned, you must have camber plates and rolled fenders to fit either of those sizes up front. If you just run a 225/40/18 up front then you don't have to do anything at that offset. if you run that offset on the rear, then even a 235/40/18 will rub on bumps.

[RealityDesign]

Originally Posted by paintpro21

If you just run a 225/40/18 up front then you don't have to do anything at that offset. if you run that offset on the rear, then even a 235/40/18 will rub on bumps.

Assuming I go 225x40x18 front and 255x35x18 rear, what offset do you recommend for 18x8.5?

[Eddy@ApexWheels]

Originally Posted by RealityDesign

Assuming I go 225x40x18 front and 255x35x18 rear, what offset do you recommend for 18x8.5?

Assuming they look identical, you could run the low offset up front, and the high offset in the rear.

But I don't see the point of an 8.5" square setup if you're going to stagger the tires and run a narrow front and oversized rear tire. (optimal tire for 8.5" wheel is 235).

[RealityDesign]

Originally Posted by paintpro21

Assuming they look identical, you could run the low offset up front, and the high offset in the rear.

But I don't see the point of an 8.5" square setup if you're going to stagger the tires and run a narrow front and oversized rear tire. (optimal tire for 8.5" wheel is 235).

Well, ideally I just want to run 245 in the rear, which is what I have now. Unfortunately, the Z1SS and RE11 don't come in 245x35, only 245x40 which is too tall. That's where the 255 came in...

As for the wheels, you're right that a square setup doesn't make sense.

So, here is the last question (I promise ):

Will the following fit?

225x40x18 (25.1" overall diameter) on 18x8 +34mm front
255x35x18 (25.0" overall diameter) on 18x8.5 +37mm rear

If not, it's back to the drawing board.

[RealityDesign]

Originally Posted by maxnix

Why not look at better quality tires? BMW did.

Those off sets are not optimal. Might as well look for a better wheel fitment also.

Decide on which tire first then choose the best wheel to support its function.

Is that supposed to be a joke? Better quality tires than the #1 and #2 best rated tire on tirerack? The Dunlop Z1's are some of the best street tires available...the only tire I'd rather have (but for considerably more money) is the Bridgestone RE11. Those are the two tires I was considering...

As for "BMW did" what does that even mean? The runflat piece of shit tires that came on my car are better quality? LOL

Finally, some of the lightest wheels that fit fell on this car are what I already have...the Breyton GTS-R's in 18x7.5 +45 and 18x8.5 +48. I was asking if this other offset would fit, simply because it seemed possible and there is a specific color I wanted only available in that fitment.

[Lubo]

Originally Posted by RealityDesign

Is that supposed to be a joke? Better quality tires than the #1 and #2 best rated tire on tirerack? The Dunlop Z1's are some of the best street tires available...the only tire I'd rather have (but for considerably more money) is the Bridgestone RE11. Those are the two tires I was considering...

As for "BMW did" what does that even mean? The runflat piece of shit tires that came on my car are better quality? LOL

Finally, some of the lightest wheels that fit fell on this car are what I already have...the Breyton GTS-R's in 18x7.5 +45 and 18x8.5 +48. I was asking if this other offset would fit, simply because it seemed possible and there is a specific color I wanted only available in that fitment.

don't worry about it, some people think that if you do not spend $300 per tire you are buying something obsolete.

He mentions that BMW choose Bridgestone's but BMW also uses Dunlops for their OEM tires.

If you are set on Breytons I would do the 18 x 7.5 +45 front and 18 x 8.5 et48 rear with 225/40 18 and 255/35 18 rear as that will be plug and play solution and not to mention you will love the newly found traction from Z1 SS.

[RealityDesign]

Originally Posted by Lubo

don't worry about it, some people think that if you do not spend $300 per tire you are buying something obsolete.

He mentions that BMW choose Bridgestone's but BMW also uses Dunlops for their OEM tires.

If you are set on Breytons I would do the 18 x 7.5 +45 front and 18 x 8.5 et48 rear with 225/40 18 and 255/35 18 rear as that will be plug and play solution and not to mention you will love the newly found traction from Z1 SS.

Yeah, I already have a set in that size, so I would just get either the Z1's or the RE11's. I really wanted to get a matte grey set of Breytons, but that red ring (on the proper offset) is kind of obnoxious in my opinion. I guess I'll just buy tires for now, and in the future I may buy another set and paint the red ring grey or something.

As for the pricing...the Z1's are a hell of a lot more expensive than they used to be! I remember when they were $150 a tire, now they're $252 for a 255x35x18. Not exactly a "cheap" tire...lol

I may go with the RE-11's now that they're closer in price. Only $40 more expensive per tire, used to be more like $100 more. Dry and wet traction-wise, they are almost identical, but I think the RE-11's are a bit quieter and more comfortable (although the Z1's are still good in that department).

At this point, I'm dying to know what "maxnix" is running on his car...

[Lubo]

Originally Posted by RealityDesign

Yeah, I already have a set in that size, so I would just get either the Z1's or the RE11's. I really wanted to get a matte grey set of Breytons, but that red ring (on the proper offset) is kind of obnoxious in my opinion. I guess I'll just buy tires for now, and in the future I may buy another set and paint the red ring grey or something.

As for the pricing...the Z1's are a hell of a lot more expensive than they used to be! I remember when they were $150 a tire, now they're $252 for a 255x35x18. Not exactly a "cheap" tire...lol

I may go with the RE-11's now that they're closer in price. Only $40 more expensive per tire, used to be more like $100 more. Dry and wet traction-wise, they are almost identical, but I think the RE-11's are a bit quieter and more comfortable (although the Z1's are still good in that department).

At this point, I'm dying to know what "maxnix" is running on his car...

My first set of Z1 in 225f 255r set me back close to $900 shipped from TireRack. I believe same set is costing this before any taxes or shipping, but I still think that Z1 are around $200 cheaper than AD08 or RE11s. They way I look at it is $200 can buy me one HPDE

[RealityDesign]

Originally Posted by Lubo

My first set of Z1 in 225f 255r set me back close to $900 shipped from TireRack. I believe same set is costing this before any taxes or shipping, but I still think that Z1 are around $200 cheaper than AD08 or RE11s. They way I look at it is $200 can buy me one HPDE

Yeah, $200 sounds about right. I don't track my 135, it's just a street car, so RE11's might be better just in terms of comfort. Or maybe I should put the Yoko slicks from my track car on the 135 and daily drive it on those...

EDIT: A set of RE-11's is $1060 before shipping...not too bad.

[RealityDesign]

Originally Posted by Lubo

My first set of Z1 in 225f 255r set me back close to $900 shipped from TireRack...

Did your 255's fit without rubbing? Any need to roll fenders?