Anyone running 18x9 front and 18x10 rear wheels - What tire sizes are you running

[bmw m3 s50]

I have a set of 18’s that are 18x9 et30 for the fronts and 18x10 et25 for the rears. I am debating on what tire sizes to run on the wheels. I am generally a fan of running the widest tire on wheels for my car. I am debating between:

255/40/18 fronts and 285/35/18 rears

or

265/35/18 fronts and 275/35/18 rears.

In one sense the 255’s up fronts would fit the front wheel perfectly but be 10mm narrower than the 265’s. While the 285’s would not fit perfectly on the 18x10 compared to the 275’s.

Running the other setup, the 265’s up fronts would not fit the front 18x9 like the 255’s but the 275’s would fit better on the rears.

I figured running the proper in the fronts would probably be better for steering feel and input, but I am not sure.

Is anyone running these size wheels? What tire sizes are you running?

Any thoughts or input on tire sizes?

[Slideways]

235/40 and 265/35 - modern tires are already super grippy

[Tbonem3]

I'd do 245/275 with most tires, though 236/265 with something wide like a052 or nankang. I ran 245/275 ps4s.

I have to say, I hated 9/10, much happier with 9.5/10". 9/10 felt no better than typical 8.5/10 plus the tire math is worse. Don't do it imo. Plus the stretch of the 235 or 245 tire on 9" wheel was offputting imo.

[bmw m3 s50]

I'd do 245/275 with most tires, though 236/265 with something wide like a052 or nankang. I ran 245/275 ps4s.

I have to say, I hated 9/10, much happier with 9.5/10". 9/10 felt no better than typical 8.5/10 plus the tire math is worse. Don't do it imo. Plus the stretch of the 235 or 245 tire on 9" wheel was offputting imo.

I would have to agree with you that a 9.5/10 would be the best setup but I ended up getting a killer deal for the 9/10 wheels so I jumped on it.

Also agree the tried and true 245/275 setup is the go to setup but I feel with the 9” in the front it would be a waste running the 245. Wouldn’t the 255/285 be a better use of the wider wheels?

[bmw m3 s50]

235/40 and 265/35 - modern tires are already super grippy

Agreed but 255/40 and 285/35 would be even more grip, no?

[Slideways]

Agreed but 255/40 and 285/35 would be even more grip, no?

More is not always better especially if you want an M3 with a good balance of grip and slip. 235/265 CSL setup for the street is plenty IMO unless you are FI and need the extra traction of a 275 or 285.

[bmw m3 s50]

More is not always better especially if you want an M3 with a good balance of grip and slip. 235/265 CSL setup for the street is plenty IMO unless you are FI and need the extra traction of a 275 or 285.

Well, to be fair the CSL just upsized 10mm over the standard m3 tire sizes but the biggest difference is effect on grip was the tire compound of the Pilot Sport Cup tires. One could argue going from a PS2 or Supersport compound to a Pilot Cup compound could potentially be the equivalent of upsizing 20mm or 30mm via street summer compound tire.

For me, I am about the grip not so much the slip. I am not really a fan of sliding the car and would prefer the stability of grip in the corners.

[Chas3n]

I'd do 245/275 with most tires, though 236/265 with something wide like a052 or nankang. I ran 245/275 ps4s.

I have to say, I hated 9/10, much happier with 9.5/10". 9/10 felt no better than typical 8.5/10 plus the tire math is worse. Don't do it imo. Plus the stretch of the 235 or 245 tire on 9" wheel was offputting imo.

This.

Of many setup ups I've tried over the last decade+, the 9.5 et35 and 10 et25 really work well with this chassis.

DINAN showed me the way and apex offers those sizes standard on all their wheels


Sent from my iPhone using Tapatalk Pro

[bmw m3 s50]

This.

Of many setup ups I've tried over the last decade+, the 9.5 et35 and 10 et25 really work well with this chassis.

DINAN showed me the way and apex offers those sizes standard on all their wheels


Sent from my iPhone using Tapatalk Pro

As I mentioned, I completely agree. If I had the choice the would have been the 9.5 et35 and 10 et25. I came across this setup and trying to select the best size size using these specs.

I was hoping others ran a similar setup to give me feedback.

[9kracing]

I was going to say, Dinan used 275 front and 285 rear, correct?

[bmw m3 s50]

I was going to say, Dinan used 275 front and 285 rear, correct?

Yes, that is correct. The issue is that Dinan’s wheel setup was 9.5 in front and 10 rear would makes 275 front and 285 rear a good fit. My issue is that I have a 9 in the front not a 9.5, this makes selecting the tire size more tricky.

I am thinking that a 265 on a 9” wide wheel might not fit properly but not really sure.

[DJAM3]

Has anyone tried a 255/40 275/35 setup on a 9/10 set? Rears will be slightly shorter but it's only 1.5%.

[9kracing]

Has anyone tried a 255/40 275/35 setup on a 9/10 set? Rears will be slightly shorter but it's only 1.5%.

Firestone Firehawk

245/40/19 - 26.7"

285/35/19 - 26.89"


That's what I run, but I'm on a 8.5 front wheel. I'd imagine you could still run it on a 9" wheel though.

[MTiz]

I was 19x9 and 19x10 and ran 245/265 and it felt great

[Tbonem3]

For what's it's worth, BMW put 9"/10" wheels (ZCP) on e9x and they went with 245/265(40) or 255/285 (GTS). People often usize to 255/275 though that does stray from what DSC expects. And e9x expects a larger diameter rear tire where e46 dsc expects them to be basically equal so I don't know how much value there is in this comparison.