FK8 255/40/18 on 18x9.5 +45

[Boost Blue]

Sorry if this has been answered before i can't seem to find any info on this particular set up. I'm picking up 18x9.5 +45 wheels and have purchased 255/40/18 Michelin Pilot Sport 4S. I can't seem to find anyone running these tires on that spec wheel. I'm on stock suspension, but I may consider installing spoon springs. Anyone have pictures of the fitment or know if I should be able to run this set up without rubbing/fender work?

Thanks in advance

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[ToofHurts]

I have 18 x 9.5 +44 on General GMax 255/40/18 tires lowered on H&R springs. No rubbing. No rear camber arms installed.

 

[PK1]

You will be find with those specs. Especially at stock height. (you will be fine once u add lowering springs also)

On "fitment industries" website they have a TypeR with those specs if you want a picture.

 

[Si_chRis]

255/40 on 18x9.5 is perfect on stock suspension.

I do have rub but only on super hard dips on the front when the suspension compresses. It rarely happens though.

However, my setup is +38. Your +45 setup will be sunk in just a tad, you might not even rub to be honest.

 

[Bob_L]

I'm running this setup almost exactly. I have Michelin Pilot Sport 4AS (all seasons) on Titan7 T-D6 18x9.5 +45 wheels. Stock suspension. No rubbing of any kind in any mode.

Here are some shots from the side and along the wheels to show how they sit.

Hope that helps.

-bob

 

[Boost Blue]

I'm running this setup almost exactly. I have Michelin Pilot Sport 4AS (all seasons) on Titan7 T-D6 18x9.5 +45 wheels. Stock suspension. No rubbing of any kind in any mode.

Here are some shots from the side and along the wheels to show how they sit.

Hope that helps.

-bob

Thanks Bob!
ppreciate you taking the time to post those pics. Feel much better about my wheel/tire choices. Nice looking boost blue too !

 

[HoboKit]

255/40 on 18x9.5 is perfect on stock suspension.

I do have rub but only on super hard dips on the front when the suspension compresses. It rarely happens though.

However, my setup is +38. Your +45 setup will be sunk in just a tad, you might not even rub to be honest.

What tires are you running?

 

[Cavayo]

Thanks Bob!
ppreciate you taking the time to post those pics. Feel much better about my wheel/tire choices. Nice looking boost blue too !

Beautiful ? about how much total

 

[Si_chRis]

What tires are you running?

The tires are Bridgestone Potenza RE970AS which are discontinued, but the current successor is the RE980AS.

 

[BoostedDreams]

Here’s a 18x9.5 +35 stock suspension on ps4s for more reference.
I want toget 265/35 and have a mild drop possibly on white line springs in the future. Will probably have to add some camber.

 

[Jickster343]

I'm running this setup almost exactly. I have Michelin Pilot Sport 4AS (all seasons) on Titan7 T-D6 18x9.5 +45 wheels. Stock suspension. No rubbing of any kind in any mode.

Here are some shots from the side and along the wheels to show how they sit.

Hope that helps.

-bob

Hello! I apologize for bringing this back but I am thinking of getting 255/40 tires for my TE37s (18x9.5 +45). I see that the 255/40s leave a good amount of space, do you think 255/45 tires would work or would that rub?

 

[Bob_L]

I see that the 255/40s leave a good amount of space, do you think 255/45 tires would work or would that rub?

I don't know, but I can run some numbers and make an educated guess.

Note: These numbers are calculated, not measured. As a result, they don't take into account real-world dimensions which probably vary slightly between brands.


The OEM 245/30-20 wheel & tire combo has a sidewall height of 73.5mm and an overall height of 655mm.

255/40-18 tires have a sidewall height of 102mm and an overall height of 661.2mm, which is 6.2mm taller than a stock wheel/tire combo.

A 255/45-18 is going to to have a sidewall height of 114.75mm and an overall height of 686.7mm, which is 31.7mm higher than stock.

I've read of people on these forums who use 255/35-20 tires on their stock wheels, which are 31.5mm taller than the OEM setup. Based on that it seems like it would work, but I've never read of anyone doing it.

When you plug that tire size into https://tiresize.com/comparison/ it shows there would be a fairly significant speedometer variance as well:

The last thing I'll mention is the taller sidewall on the 255/40's makes them less immediate and a bit more "floaty" as compared to the OEM wheel and tire combo - I know this from first hand experience. This will be even more pronounced on 255/45's.

If you do proceed with that tire size, please be sure to check and/or re-do the math yourself beforehand. For all you know, I'm a moron.

Anyway, please let us know what you end up doing.

-bob

 

[SmokeGhost]

Just be aware. All tires despite having the same written size are physically different in size. Tirerack has data on every tires dimensions.
in other words a bridgestone 255 40 18 will be a different physical size than a continental 255 40 18 fwiw.

 

[Jickster343]

I don't know, but I can run some numbers and make an educated guess.

Note: These numbers are calculated, not measured. As a result, they don't take into account real-world dimensions which probably vary slightly between brands.


The OEM 245/30-20 wheel & tire combo has a sidewall height of 73.5mm and an overall height of 655mm.

255/40-18 tires have a sidewall height of 102mm and an overall height of 661.2mm, which is 6.2mm taller than a stock wheel/tire combo.

A 255/45-18 is going to to have a sidewall height of 114.75mm and an overall height of 686.7mm, which is 31.7mm higher than stock.

I've read of people on these forums who use 255/35-20 tires on their stock wheels, which are 31.5mm taller than the OEM setup. Based on that it seems like it would work, but I've never read of anyone doing it.

When you plug that tire size into https://tiresize.com/comparison/ it shows there would be a fairly significant speedometer variance as well:

The last thing I'll mention is the taller sidewall on the 255/40's makes them less immediate and a bit more "floaty" as compared to the OEM wheel and tire combo - I know this from first hand experience. This will be even more pronounced on 255/45's.

If you do proceed with that tire size, please be sure to check and/or re-do the math yourself beforehand. For all you know, I'm a moron.

Anyway, please let us know what you end up doing.

-bob

I currently do have 255/35/20 tires on my OEM wheels and they do not rub, that is the reason why I was considering the 255/45/18 size tire because they are pretty much dead on. It is just that the offset is what I am worried about because the tire is going to stick out a tad bit so I am not sure if it will hit the fender or not but will definitely do some measurements beforehand.

https://tiresize.com/wheel-offset-calculator/

Thank you for taking the time to do the research for me, I really appreciate it! Also, your last sentence from the second to last paragraph made me chuckle XD. I will definitely let you know what I end up doing!

 

[Jickster343]

Just be aware. All tires despite having the same written size are physically different in size. Tirerack has data on every tires dimensions.
in other words a bridgestone 255 40 18 will be a different physical size than a continental 255 40 18 fwiw.

Will put this into consideration when I choose which tires to go with, thank you for the information!

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