Will this fit? (width, offset and tire size Qs)

[Slick]

Originally Posted by ChrisP

I just got new wheels that measure 18x8.5 with a 33 offset and I was wondering what size tire I should put on. I was thinking 245 but will that rub? Should I go smaller?

245/35R18 is the right size tire. Won't rub.

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[ZOMFGAARON]

Hey guys, my fiancé bought me xxr 527's in 18x8.75 +35 and i have a question since i'm a super noob.

Will 225/45/18 work fine on stock suspension?
Also i'm planning on lowering on eibach sportlines in a month or so will these tires work with this setup as well or would you recommend a different size?

[churchx]

225/45/R18 tires are not just wider, but also with bigger rim diameter and higher sidewalls, so you may see some acceleration degradation vs stock. Ride 17.2mm higher, speedo error 5.21%. Why not 225/35/18, for closer to stock diameter (within 1.72%)?

[Thatguyjeremy]

So my current set up is 17x9 +35 and I'm running 235/45 tires. I'm currently lowered about 2" F&R with F camber at about -1.9 and R at 2.5 (I could actually dial it back to -2 and be perfectly flush). I just purchased a set of 18x9.5 +40 and I'm leaning on buying 255/35 tires.. Should I go 245/35 or just stick with the 255.. and will I need to run more -camber? I'm not to worried about slight rub here and there, just don't want to excessively rub. Thanks in advance, I know I'm a n00b.

[ZOMFGAARON]

Originally Posted by churchx

225/45/R18 tires are not just wider, but also with bigger rim diameter and higher sidewalls, so you may see some acceleration degradation vs stock. Ride 17.2mm higher, speedo error 5.21%. Why not 225/35/18, for closer to stock diameter (within 1.72%)?

Oh I didn't know that maybe I'll change my order to 225/35 is there a major difference or advantage minus the speedo?
Or is there a tire that would fit any better?

Thanks for the help I really know nothing about this.


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[Stang70Fastback]

Didn't see this pinned post until after I created my thread, but I'll post it here since this is where it belongs:

I have a set of 18x9 ET40 wheels (HRE FF15) to put on the car come spring. I'd like to fit 255/35R18 tires on it (Michelin PSS), but I'm still on stock suspension. The manufacturer of the wheels has confirmed fitment with 245 section tires, but I'm wondering if anyone can confirm if 255s will fit without rubbing the spring perch. Also, I've got some OEM crash bolts I'm going to use to adjust the front camber, and am wondering if you think I'll be able to eek out just 1 degree of negative camber as well.

The reason I'm sticking with stock suspension is so that I can run C Street this year (using the OEM wheels as dedicated autocross wheels). So I have no interest in changing the suspension at all. I just want to use these DD wheels.

[churchx]

ZINFGAARON: check some online tire size calculators. For example like this. There you can see differences of diameter/circumference/speedo reading difference/ride height change and such. Or made for our cars that also show wheel clearance this (change tire placement for both to be front or rear, if comparing tire size fitment, not same tire set on front-rear).
Simplest bet if you don't wish to change much resulting performance is to keep at least circumference somewhat similar to that of stock tire size's. After all, different circumference = different gearing ratio. So noticeably bigger diameter/circumference tire will make gears "taller" (longer distance travelled for same count of wheel/engine evolutions), resulting in worse acceleration (but higher top speed, which most probably you almost never need of unlike acceleration).
To get that usually means when using bigger diameter wheels (R17>R18), reducing at same time height of tire sidewall (profile, which is given as % from tire width), and vice versa, if you install R16 wheels, worth proportionally rising sidewall height. Note though, that as profile number is % of width, not specific length measurement, it changes also for different widths. For example, if you want to install narrower winter tires of 205 width vs 225 summers, then it's worth to up profile/sidewall a step, from 225/35/R18 to 205/40/R18.

[tyler_win_photo]

Originally Posted by Stang70Fastback

Didn't see this pinned post until after I created my thread, but I'll post it here since this is where it belongs:

I have a set of 18x9 ET40 wheels (HRE FF15) to put on the car come spring. I'd like to fit 255/35R18 tires on it (Michelin PSS), but I'm still on stock suspension. The manufacturer of the wheels has confirmed fitment with 245 section tires, but I'm wondering if anyone can confirm if 255s will fit without rubbing the spring perch. Also, I've got some OEM crash bolts I'm going to use to adjust the front camber, and am wondering if you think I'll be able to eek out just 1 degree of negative camber as well.

The reason I'm sticking with stock suspension is so that I can run C Street this year (using the OEM wheels as dedicated autocross wheels). So I have no interest in changing the suspension at all. I just want to use these DD wheels.

I would say most likely not, especially if you try to run camber bolts in the front as the camber will tilt the wheel + tire closer to your spring perch.

[Slick]

Originally Posted by Stang70Fastback

Didn't see this pinned post until after I created my thread, but I'll post it here since this is where it belongs:

I have a set of 18x9 ET40 wheels (HRE FF15) to put on the car come spring. I'd like to fit 255/35R18 tires on it (Michelin PSS), but I'm still on stock suspension. The manufacturer of the wheels has confirmed fitment with 245 section tires, but I'm wondering if anyone can confirm if 255s will fit without rubbing the spring perch. Also, I've got some OEM crash bolts I'm going to use to adjust the front camber, and am wondering if you think I'll be able to eek out just 1 degree of negative camber as well.

The reason I'm sticking with stock suspension is so that I can run C Street this year (using the OEM wheels as dedicated autocross wheels). So I have no interest in changing the suspension at all. I just want to use these DD wheels.

I'll add to this...

Keep in mind that on an 18" wheel, the part that will contact the spring perch is the edge of the wheel. (on a 17" wheel, it's the tire sidewall that is closest)

So it is feasible to do a test-fitment, with just the wheel to see if it will clear. My guess is that it should clear with completely stock suspension. Then swap the crash bolt in and re-measure clearances.

You will need to load that wheel in it's compressed state to accurately measure clearances. (i.e. support the wheel raised off the ground, then lower the car so the suspension compresses)

As long as you have 3-5mm between the perch and the wheel rim, you should be fine.

[Ketchum88]

I am currently running 18x9.5+38 square wrapped with 245/35-18 tires.
I also have installed Whiteline rear LCRs and Whiteline front camber bolts.

Basic question would be can I just run an Eibach Pro Kit / TRD Springs....or will I have to jump on the Coilover bandwagon?

[swarb]

Originally Posted by Ketchum88

I am currently running 18x9.5+38 square wrapped with 245/35-18 tires.
I also have installed Whiteline rear LCRs and Whiteline front camber bolts.

Basic question would be can I just run an Eibach Pro Kit / TRD Springs....or will I have to jump on the Coilover bandwagon?

It depends on who you ask. Some run it. Some say it is dangerously close. About 5mm or so BEFORE lowering. You decide what is safe as everyone runs slightly different alignment/tires and no one knows how safe it will be for you. The wheel gains negative camber when lowered so it will be closer than is currently is. You could always take out camber with camber bolts or add a small 3-5mm spacer for clearance. Still not safe enough for my liking.

In my opinion coilovers are the way to go with 9.5 widths. And don't call it a band wagon. Big boy 9.5 width wheels require big boy coilovers.

[PandaSPUR]

So I have a very good potential deal for a set of used wheels. I love the wheels, but they're bigger than what I was originally aiming for. Trying to figure out if the following would fit with just coilovers and no fender work:

Front: 18 x 9 +38 offset w. 255/35/18 tires
Rear: 18 x 10 +38 offset w. 275/35/18 tires

The front I know is no problem. The rear, according to the fitment guide stickied in this section says that I'd be sticking out 18mm past flush on a 1" drop. Is this fine? 18mm doesnt sound like much, but I just want to be sure. Previous owner also says it fits his twin without anything other than coilovers.

[Jesse1292]

Enkei RS05RR 18x9.5+43 all around. Will also be getting coils and lowering the car about an inch. Was wondering what tire size would be best without having any clearance issues.

[Slick]

Originally Posted by PandaSPUR

So I have a very good potential deal for a set of used wheels. I love the wheels, but they're bigger than what I was originally aiming for. Trying to figure out if the following would fit with just coilovers and no fender work:

Front: 18 x 9 +38 offset w. 255/35/18 tires
Rear: 18 x 10 +38 offset w. 275/35/18 tires

The front I know is no problem. The rear, according to the fitment guide stickied in this section says that I'd be sticking out 18mm past flush on a 1" drop. Is this fine? 18mm doesnt sound like much, but I just want to be sure. Previous owner also says it fits his twin without anything other than coilovers.

Yeah,no issues with the fronts.
I run 18x9 +35 on 265's with no rubbing on a 1.25" drop and -2.75 camber. You're tucked in 3mm more and a bit less tire, perfect.

Rears should be fine depending on your camber. You might need to dial some more in. Many folks are running 18x9.5 +38 and sit pretty flush but 6mm more outside and inside, plus more tire also than these guys typically run. It's gonna be tight but doable with the right specs.