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[grilledruben]

Good Day everyone.

I just purchased Apex ARC-8 rims 18/8.5 et 38 and 18/9.5 et 35.
Im driving a 2006 330xi e90 on H&R coils.

Wondering what everyone thinks for tires on the rear?
I want to run a 245/40/18 on the front
They recommend a 265/35/18 for the rear but has anyone installed 275/35/18?
My rear fenders are rolled a little and I have some natural camber from being lowered.

Will 275 rub on the rear? Worth getting a wider tire?
Anyone got pictures?

[Expert@ApexWheels]

Congrats on the wheels! We typically recommend 235/40-18 front and 265/35-18 rear for those wheel sizes. With xDrive, it's also important to keep the front and rear rolling diameter difference as close to 0% as possible. The above setup is 0.4% different, which is within the 1% threshold.

The 245/40 and 275/35 setup you're proposing is 0.5% different, so you're good to go with those sizes as well, but you'll likely need rolled rear fenders to prevent rubbing. You may also experience slight rubbing on the front fender liners during full-lock turns if the car is super low due to the 245/40 being 8mm taller than the 235/40.

Here are some reference photos:






Front: 18x8.5" ET35 with 235/40-18 tires
Rear: 18x9.5" ET35 with 265/35-18 tires



We don't have photos showing the 245/40 setup in the front, but here's how a 275 looks on a 9.5" ET35 wheel on the rear (in 17"):



--Dylan

[Banana Clipper]

I've run as big as 255/40/18 Front (5mm spacers) and 265/35/18 Rear on the MSport suspension but once I lowered it I had to go 235/40/18 in the front to clear the fender and I still get slight rubbing on certain driveways and U shaped dips on the freeway

[nissubaru]

Originally Posted by grilledruben

Good Day everyone.

I just purchased Apex ARC-8 rims 18/8.5 et 38 and 18/9.5 et 35.
Im driving a 2006 330xi e90 on H&R coils.

Wondering what everyone thinks for tires on the rear?
I want to run a 245/40/18 on the front
They recommend a 265/35/18 for the rear but has anyone installed 275/35/18?
My rear fenders are rolled a little and I have some natural camber from being lowered.

Will 275 rub on the rear? Worth getting a wider tire?
Anyone got pictures?

Why do you need wider tires? Your 330i is unlikely to have traction issues compared to a 335i for instance. Outside of function, you have the aesthetic purpose..which I'm all for, but I think you're asking for a bad time with 275s in the rear. I can't remember if I'm running 255 or 265 and a 5 or 10mm spacer. Rolled fenders + camber and I still rub on some big dips. The sidewalls of my tires are rubbing down pretty good too, like the lettering, not so much uneven treadwear.

Maybe I'm getting older but I prefer not to worry about bumps and shit like that. When I put my winter setup on they don't rub and I can relax a bit lol

[tcphoto]

Just look at how long he's been here, he seems to be part of the Fast and Furious crowd. He has an older E90 that's lowered, fenders rolled and thinks he knows better than BMW's engineers and those of us that have been here longer. I must be getting older also!

BTW, I'm running 235/40/18 and 265/35/18 on my E92 with stock suspension without an issue and it looks good.

[Antetokounmpo]

Originally Posted by tcphoto

Just look at how long he's been here, he seems to be part of the Fast and Furious crowd. He has an older E90 that's lowered, fenders rolled and thinks he knows better than BMW's engineers and those of us that have been here longer. I must be getting older also!

BTW, I'm running 235/40/18 and 265/35/18 on my E92 with stock suspension without an issue and it looks good.

Fast and furious crowd would be running a 205 on a 9.5" wheel.

There's nothing wrong with more grip from wider fronts and rears, there are trade-offs to be made though, like worse road manners, fuel economy, etc. Engineering is about trade-offs.

[bobdrake]

Originally Posted by Expert@ApexRaceParts

Congrats on the wheels! We typically recommend 235/40-18 front and 265/35-18 rear for those wheel sizes. With xDrive, it's also important to keep the front and rear rolling diameter difference as close to 0% as possible. The above setup is 0.4% different, which is within the 1% threshold.

The 245/40 and 275/35 setup you're proposing is 0.5% different, so you're good to go with those sizes as well, but you'll likely need rolled rear fenders to prevent rubbing. You may also experience slight rubbing on the front fender liners during full-lock turns if the car is super low due to the 245/40 being 8mm taller than the 235/40.

Here are some reference photos:






Front: 18x8.5" ET35 with 235/40-18 tires
Rear: 18x9.5" ET35 with 265/35-18 tires



We don't have photos showing the 245/40 setup in the front, but here's how a 275 looks on a 9.5" ET35 wheel on the rear (in 17"):



--Dylan

Thank you fo this reply. I also purchased Apex ARC-8 rims 18/8.5 et 38 and 18/9.5 et 35 and I was interested to learn more about these tires. As I see you are an expert so maybe you can also help me with these tires Cooper Discoverer A/T3 4S. They are for Ford F 150.I won two cars but I am not a professional in this field. I was recommended to buy them and read about them at https://serioustruck.com/best-tires-for-ford-f150-4x4/. Maybe you can give me some suggestions about these tires because if speaking about the things discussed in this thread, everything is clear to me.