[Solidjake]

Morning guys. Today I hit a real nasty piece of metal on the highway and it destroyed the sidewall on one of my PSS's. Current setup is 18x8.5 ET35 with PSS 245/40 all around square setup.

I commute a lot more now and don't track my car so I want to switch to all seasons. I have Michelin X-Ice 3's for the winter. I'm looking to see which tire size would be best for the wheel specs.

235/40
235/45
245/40


235/45 is what I'm learning towards to have a bit more sidewall.

[alohasurftoad]

235/45/18(26.3") taller sidewall will provide better ride, impact protection and reduce wheel gaps further. will look a pinch beefy if you don't mind.
https://f30.bimmerpost.com/forums/sh...3&postcount=29

you may want to also consider 255/40/18(26"). max size on 8.5" width, so there's tiny bit of sidewall bulge, reduces fenderwell gap with girth.
https://f30.bimmerpost.com/forums/sh...8&postcount=46
https://f30.bimmerpost.com/forums/sh...7&postcount=19
no bulge on 9" width
https://f30.bimmerpost.com/forums/sh...4&postcount=66

245/40/18(what you have now) fits optimally on 8.5", lower profile provides sharper turn-in and looks nicer, especially if you're lowered.

since you have winters, i'd actually stay with a summer such as MPS4S, however if you are definitely switching to a ultra high performance all season then i'd go with MPSAS4, ContiDWS06+, Goodyear Exhilarate

[Solidjake]

alohasurftoad I cannot thank you enough for your reply. I ended up ordering the 235/45's so the ride is a bit more comfortable (even better for the wife and daughter). Will report back once I put more miles on the DWS06+

[Solidjake]

Alohasurf Drive drives great on the DWS06+. Nice and smooth and great over bumps. Thanks!

[Tallest]

Originally Posted by Solidjake

alohasurftoad I cannot thank you enough for your reply. I ended up ordering the 235/45's so the ride is a bit more comfortable (even better for the wife and daughter). Will report back once I put more miles on the DWS06+

Please post pics from side or 3/4 angle of the car on new tires. Considering same setup for winter.

[Solidjake]

Originally Posted by Tallest

Please post pics from side or 3/4 angle of the car on new tires. Considering same setup for winter.

Hey, this is what I have on hand

[Maximus92]

That looks awesome!

[Tallest]

Originally Posted by Solidjake

Hey, this is what I have on hand

Wait, this is 235/45 R18 8in rim?? This looks SO good.

[Solidjake]

Originally Posted by Tallest

Wait, this is 235/45 R18 8in rim?? This looks SO good.

On 8.5's. ET35



Note to self, idk if I should have put the tire shine on it. I like the matte look for I will find one that maintains that.

[alohasurftoad]

Originally Posted by Solidjake

I like the matte look for I will find one that maintains that.

Adam's VRT. matte, no sling, water and dust resistant.

[Solidjake]

Originally Posted by alohasurftoad

Adam's VRT. matte, no sling, water and dust resistant.

Thanks!

[AndrewC1989]

Originally Posted by Solidjake

I ended up ordering the 235/45's so the ride is a bit more comfortable

Do you feel any noticeable change (decrease) in acceleration after slightly increasing the wheel diameter?

I want to do the same with my next set of tires but not at the cost of acceleration. Granted you went from 245/40 to 235/45 which is a +2.3% increase whereas I'd be going from 225/45 which would only be +1.2% so I feel like you'd be more likely to feel a difference than I would.

[Solidjake]

Originally Posted by AndrewC1989

Do you feel any noticeable change (decrease) in acceleration after slightly increasing the wheel diameter?

I want to do the same with my next set of tires but not at the cost of acceleration. Granted you went from 245/40 to 235/45 which is a +2.3% increase whereas I'd be going from 225/45 which would only be +1.2% so I feel like you'd be more likely to feel a difference than I would.

Honestly I have not noticed any changes. From a stop it's not noticeable and on the highway the car picks up great.

[Maximus92]

Isn't ride more comfortable on 245/40 than on 235/45? Does 235/45 have a higher or a lower sidewall than 245/40? Considering those 2 dimensions for my summer square set up (currently running stock 17), I would like a higher sidewall as well, seen 245/40 looks meaty and I like it, but I want smooth and comfortable ride. As I read most prefer 235/45 set up.

[alohasurftoad]

245x40%=98mm sidewall
225x45%=101.25mm sidewall(oem)
235x45%=105.25mm sidewall

245/40/18 best increased performance
235/45/18 best combination of ride, bump in increased grip, slightly reduced fenderwell gap.

no need to overthink this. choose based what you desire most. either choice is fine.

[Polo08816]

Originally Posted by Solidjake

Morning guys. Today I hit a real nasty piece of metal on the highway and it destroyed the sidewall on one of my PSS's. Current setup is 18x8.5 ET35 with PSS 245/40 all around square setup.

I commute a lot more now and don't track my car so I want to switch to all seasons. I have Michelin X-Ice 3's for the winter. I'm looking to see which tire size would be best for the wheel specs.

235/40
235/45
245/40


235/45 is what I'm learning towards to have a bit more sidewall.

Originally Posted by Maximus92

Isn't ride more comfortable on 245/40 than on 235/45? Does 235/45 have a higher or a lower sidewall than 245/40? Considering those 2 dimensions for my summer square set up (currently running stock 17), I would like a higher sidewall as well, seen 245/40 looks meaty and I like it, but I want smooth and comfortable ride. As I read most prefer 235/45 set up.

Originally Posted by alohasurftoad

245x40%=98mm sidewall
225x45%=101.25mm sidewall(oem)
235x45%=105.25mm sidewall

245/40/18 best increased performance
235/45/18 best combination of ride, bump in increased grip, slightly reduced fenderwell gap.

no need to overthink this. choose based what you desire most. either choice is fine.

It seems like the OP originally opted for a tire size that has a lower sidewall height than OEM.

If he's running 18x8.5 all around, he could also run a 255/40-18 tire which is the original sidewall height.

[AndrewC1989]

Originally Posted by Maximus92

Isn't ride more comfortable on 245/40 than on 235/45?

No, the 235/45 has a larger sidewall:

https://tiresize.com/calculator/

Originally Posted by Solidjake

Honestly I have not noticed any changes. From a stop it's not noticeable and on the highway the car picks up great.

Good to hear. I'll be getting my next set of MPSAS4 in 235/45/18

[alohasurftoad]

Originally Posted by AndrewC1989

I'll be getting my next set of MPSAS4 in 235/45/18

FYI, 235/45/18 is typically 26.3". for some reason a MPSAS4 in 235/45/18 is 26.7". it's sidewall will be 0.2" more than a typical 235/45/18 sidewall, so it'll look quite beefy and heigtening gearing slightly more.

for some reason, many MPSAS4 tires are taller than typical for a given size, not sure why...
.

[AndrewC1989]

Originally Posted by alohasurftoad

FYI, 235/45/18 is typically 26.3". for some reason a MPSAS4 in 235/45/18 is 26.7". it's sidewall will be 0.2" more than a typical 235/45/18 sidewall, so it'll look quite beefy and heigtening gearing a bit more.

That's weird, I wonder why that is. Good to know though, guess I'll have to pick a different tire.

[alohasurftoad]

Originally Posted by AndrewC1989

That's weird, I wonder why that is. Good to know though, guess I'll have to pick a different tire.

many tire reviews out there. here is a one of many

[chowser51]

Originally Posted by alohasurftoad

for some reason, many MPSAS4 tires are taller than typical for a given size, not sure why...
.

I wonder if it’s because of the rim protection?

[alohasurftoad]

Originally Posted by chowser51

I wonder if it’s because of the rim protection?

i don't think so. using nominal numbers, the aspect ratio is not really correct. 235x45%=105.75mm =4.16" sidewall =(4.16+4.16+18) =26.33" diameter.

if you do the math, a 235 that is 26.7" is more like a 47% aspect ratio sidewall.

maybe the mold designer partied too much the night before he made it,
.