[matt2621]

Hey everyone,

I cannot seem to get a direct answer anywhere so I want your expertise. I recently bought a 2013 335i xdrive. It has the square 225/45/18 et34 setup. Car is stock other than an MST Intake. I'm looking at getting a second set to run in the summer months but I'm looking to go with 19s. This is a multi part question:

Will 19x8.5 +33 Rohana RFX11's on 225/35/19 fit just fine or will I have any rubbing issues?

Should I go 225/40/19 instead of 225/35/19?

Would I be better off going with 235 instead of 225 for any reason?


I really appreciate your feedback

[Th3Walrus]

225 is the min. width of tire for 8.5" wide rim. A 225 really should be on an 8" rim.

225/40 is the correct size for 19", not 225/35.

[matt2621]

ok, 225/40 it is. Would there be any fitment issues with going with a +33 offset on a 19x8.5?

[Kooner23]

It would probably be more ideal to go with a 235 on an 8.5" rim. The minimum recommended is a 225 tire on the 8.5" but it'll probably stretch the tire a bit.

[alohasurftoad]

OP, you should run 235/40/19(26.4"). fits good on 8.5", 0.2" more sidewall than a 225/40/19, will give a better ride, impact protection and help to fill the some of the unsightly fenderwell gap

[J555]

Originally Posted by alohasurftoad

OP, you should run 235/40/19(26.4"). fits good on 8.5", 0.2" more sidewall than a 225/40/19, will give a better ride, impact protection and help to fill the some of the unsightly fenderwell gap

While it's good solution for square setup with 8.5" wide wheels, for six cylinder (and especially if you consider further engine tune) I'd suggest considering the staggered setup with wider rear rims and 235/265 tires or wider...

[Desertnate]

Originally Posted by J555

While it's good solution for square setup with 8.5" wide wheels, for six cylinder (and especially if you consider further engine tune) I'd suggest considering the staggered setup with wider rear rims and 235/265 tires or wider...

I think it depends on what you want to do with the car.

Going square makes the handling more balanced and dials back some of the car's tendency to understeer. For blasting down backroads, autocrossing, or even track time, the added ease of rotation in the car is a real bonus. The only thing I miss when going from my square winter set up back to my OEM staggered set for summer is the rotation. I have far more grip with the summers, but the car isn't as agile.

Ideally if you wanted to improve the grip and keep the agility, a wider square set up would be the way to go.

[matt2621]

Originally Posted by alohasurftoad

OP, you should run 235/40/19(26.4"). fits good on 8.5", 0.2" more sidewall than a 225/40/19, will give a better ride, impact protection and help to fill the some of the unsightly fenderwell gap

alohasurftoad So the OEM 19" front setup is 225/40/19. If I daily the car and don't track it, does it make sense for me to deviate from that and go with 235? I understand your reasoning, just wondering if it makes sense for me to "deviate" from that setup if I only do commutes from work and back.

[matt2621]

Originally Posted by J555

While it's good solution for square setup with 8.5" wide wheels, for six cylinder (and especially if you consider further engine tune) I'd suggest considering the staggered setup with wider rear rims and 235/265 tires or wider...

I appreciate the feedback. Will oem size lugs still work when going from 8.0 to 8.5 wheels?

[alohasurftoad]

Originally Posted by matt2621

alohasurftoad So the OEM 19" front setup is 225/40/19. If I daily the car and don't track it, does it make sense for me to deviate from that and go with 235? I understand your reasoning, just wondering if it makes sense for me to "deviate" from that setup if I only do commutes from work and back.

IMO 225 is narrow for 6-cyl torque, however if its just for daily commute, you never drive sporty and your not convinced of the improvement this small deviation to a 235 will have, don't deviate.

personally, with 6-cyl torque and 8.5" width, i'd deviate even further, to a 255/35/19 square setup for high speed sweepers...
https://f30.bimmerpost.com/forums/sh....php?t=1353997

[matt2621]

Originally Posted by alohasurftoad

IMO 225 is narrow for 6-cyl torque, however if its just for daily commute, you never drive sporty and your not convinced of the improvement this small deviation to a 235 will have, don't deviate.

personally, with 6-cyl torque and 8.5" width, i'd deviate even further, to a 255/35/19 square setup for high speed sweepers...
https://f30.bimmerpost.com/forums/sh....php?t=1353997

I agree, just wanted to fully understand. I know I asked this question above but since you just replied, will oem size lugs work with 8.5 wheels or will I need longer?

[alohasurftoad]

Originally Posted by matt2621

I agree, just wanted to fully understand. I know I asked this question above but since you just replied, will oem size lugs work with 8.5 wheels or will I need longer?

the oem lug bolts will work.

longer lug bolts are only required if you use a spacer.

[wdeerfield]

do 235/40/19. Nothing but benefits from it. I run that on my F30 for summer fronts.

[matt2621]

you guys have been an enormous help. As you can see I'm new here but will definitely be using these threads more.

[alohasurftoad]

here is a bmw F30 xdrive (340i) with bronze rohana rfx11 19x8.5 +33 with 255/35/19 square on stock suspension. https://www.customwheeloffset.com/wh...ock-suspension

fyi, the 8.5" width on a rfx11 has a flat face, no concavity. i thought i'd let you know now, in case you were expecting more, concavity.

i still feel Michelin Pilot Sport 4S in 235/40/19 would be most suitable according to what you wrote for your needs, which is daily commuter. unfortunately they are quite expensive in this size.

[matt2621]

That's great info to know and nice to see an actual picture of it. Since we're on the fitment topic, the more and more "options" ive looked at today, the more I may go with something else besides the rfx11. The recommended offset of the f30 is +35-45, but a lot of 19x8.5 that i see are +30. Will this offset also work ok, just with a bit more poke? And will that poke be too much that it doesn't look flush and just looks goofy?

[alohasurftoad]

Originally Posted by matt2621

the more I may go with something else besides the rfx11. The recommended offset of the f30 is +35-45, but a lot of 19x8.5 that i see are +30. Will this offset also work ok, just with a bit more poke? And will that poke be too much that it doesn't look flush and just looks goofy?

it depends on the tire width. up front, +30 with 235/40/19 will be flush but poke a little with 255/35/19. are you going with square for rotatability and it being less costly than staggered?

[matt2621]

Yes, 100% planning on going square and likely 235/40/19 from what I've gathered here

[AspektUSA]

https://motoiq.com/how-to-properly-s...r-performance/

Posting this article written by an actual race car driver, once again.

tl;dr - look on tirerack.com at a tire's actual Tread Width (225/235/245 are not exact measurements), select a tire that is approx 0.5" narrower than your wheel.

Have an 8.5" wheel? Select a tire that has a tread width of 8.1".

[JonathanFa004]

When I have a fitment question like this I normally call the dealers that sell aftermarket wheels and they help me out with every question I have. I recently bought the RFX13 from unleashedwheels and they were able to help with me with my fitment questions. Hope this helps in some way!

[Silverlining_m2]

I run 235/35r19 on 19x8.5 et33 wheels, but I'm lowering my car on the 9th. If I were not, I would have purchased 235/40 for sure.

[obzen]

Initially I put 235/40 on a 8.5 wheel with et30 and I was rubbing on the front on full lock. If your wheels are above et30 should be no rub but I had to learn the hard way. 235 tire stands taller than the 255/35/19 something to think about also