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[who's ur daddy?]

Has anyone gone up in profile?

I have an opportunity to buy some tires with a taller profile. I really don't care about the look of a tire with more rubber quite honestly. The diameters front and rear are basically the same...

If it's a sporty summer tire, will the taller sidewall really affect handling much. Other than that, my only other concern would be the taller tire fitting into the wheel well but am guessing a small increase in profit won't hurt...

Lemme know what you think.

[John 070]

I think the only reason you would consider that is for looks. But since you don't care about looks, I don't think it's a good idea. What I mean is some people like to be different and not the same as everyone else, so they go with something that isn't a correct fitment.

[who's ur daddy?]

Originally Posted by John 070

I think the only reason you would consider that is for looks. But since you don't care about looks, I don't think it's a good idea. What I mean is some people like to be different and not the same as everyone else, so they go with something that isn't a correct fitment.

sorry, not following you.

the tire size in the subject line will result in more black sidewall. not necessarily the best thing for a sporty low profile tire look...

assuming it fits the wheel well without rubbing, then the only other thing the bigger tire would affect is the speedo...

[uabimmer]

also i believe ride quality (as far as softness) would be improved , but ever so slightly

[meyergru]

Originally Posted by who's ur daddy?

Has anyone gone up in profile?

I have an opportunity to buy some tires with a taller profile. I really don't care about the look of a tire with more rubber quite honestly. The diameters front and rear are basically the same...

If it's a sporty summer tire, will the taller sidewall really affect handling much. Other than that, my only other concern would be the taller tire fitting into the wheel well but am guessing a small increase in profit won't hurt...

Lemme know what you think.

Yup. I did that and I know of at least two other people. Still very satisfied. It's been discussed before...

http://www.e90post.com/forums/showthread.php?t=225228

http://www.e90post.com/forums/showthread.php?t=194743

http://www.e90post.com/forums/showpost.php?p=3700538

Here's what you get, in a nutshell:

1. Higher max speed.
2. More exact speedometer.
3. Better ride quality.
4. Better filled wheel wells.

[gfortner]

I recently ordered 19" Forgestars for my 2007 e92. Because I'm not dissatisfied with the factory sport suspenison ride/handeling, I'm planning to install 225/40 Hankook V12 on the front and 255/35 Hankook V12on the rear of my 8.5" front and 9.0" rear Forgestars. I realize that most posters to this blog are probably not in agreement based on all the 8.5/10.0 setups that I read, but I think meyergru is right on with the expected benefits of the taller tires.

Once I'm all mounted up, I'll take pictures and post my impression of the difference from the stock 18" setup.

Regards,

Gary

[gfortner]

Below are pictures of my 19" Forgestars on my e92 coupe. I have included pictures before and after the installation. I decided to run 225/40/19 front and 255/35/19 rear tires on the 8.5" front width and 9" rear width wheels.

I have no clearance issues, the car rides great on the stock suspension, and I don't notice any major speedo difference (although I know an additional inch of tire diameter did affect the speedo). I also like the the look of the larger tires to fill in the wheel wells without having to lower the suspension.

[meyergru]

Looks great. You'll notice the speedo difference when you get send a free photo from a speedcam...

Subjectively, it's no difference. Here in Germany, many drivers go ~20 km/h faster than the posted speed limit since fines get much higher exceeding this. Now I know that in-town that means more like 15km/h faster for most cars.

Since the difference is percentual, it grows to a fair amount at top speed. Our german models are limited to ~268km/h according to speedo which should equal 250km/h real speed. With the larger diameters it's real for my car, which some limited M3 have already experienced. Also, 268km/h is not far below unlimited 335i max speed any more.

[Ja50n934]

Hello All,

I'm a new member and I've been reading all the information I can here.

Just to be clear, will 225/45-18 and 255/40-18's work on a 2009 328i non-sport suspension?

Thanks to everyone for the wealth of info here.

[meyergru]

Originally Posted by Ja50n934

Just to be clear, will 225/45-18 and 255/40-18's work on a 2009 328i non-sport suspension?

Yes, if you use them on BMW 18" staggered rims that are designed for 225/40-18 and 255/35-18, which means the rims must have the correct widths and offsets.

[Ja50n934]

Yes, if you use them on BMW 18" staggered rims that are designed for 225/40-18 and 255/35-18, which means the rims must have the correct widths and offsets.

Exactly the answer I was looking for.

Thanks Meyer.

[mattsten]

Originally Posted by Ja50n934

Hello All,

I'm a new member and I've been reading all the information I can here.

Just to be clear, will 225/45-18 and 255/40-18's work on a 2009 328i non-sport suspension?

Thanks to everyone for the wealth of info here.

Personally I would get 235/40-18 and 265/35-18. Some people don't like the idea of the 265 on a 8.5" rim, but it seems to work fine. BMW has in the past used a rim a half of an inch too narrow on several vehicles....

[dbarragan]

hi, is it possible to use tires 225/45 18" on all four wheels? my E92 has not sport suspension but has 8Jx18 front wheels and 8.5Jx18 rear wheels style 189.

It seems the 225/45 is in good range for the wide 8.5Jx18 wheels, I just want to make sure no damage to the differential or transmission will occur by doing this, there are so much stories around this subject,

Thanks in advance.

[demontwinz]

so what if i go 235/40/18 front and 255/40/18 back on BBS RGR 18 , 8.5, will this work?

e92 coupe 335i , sport suspension

I will have more comfort, correct speed but slower acceleration?

[meyergru]

Originally Posted by demontwinz

so what if i go 235/40/18 front and 255/40/18 back on BBS RGR 18 , 8.5, will this work?

e92 coupe 335i , sport suspension

I will have more comfort, correct speed but slower acceleration?

It would fit, but I would not recommend that combination, because the diameters differ ~ 2.5% which can cause DSC and ABS problems. 235/45/18 is only 1.1% difference and 225/40/18 is 0.2%, but the latter don't fit too good on 8.5" rims. I don't really know if 235/45/18 would still fit, though. You have 8.5" all around, so it partly depends on the offsets, too.

The "slower" acceleration lasts only up to ~30mph in 1st gear - after that, you lose earlier when you are force to change into the next higher gear eralier when the tires are normal while with larger diameters, you can stay longer in the lower gear. An even in 1st gear, you cannot put down the torque you have, so you lose almost nothing.

[demontwinz]

so i should copy your set up

225/45/18 and 255/40/18

this should be pretty good comfortable.

[meyergru]

Originally Posted by demontwinz

so i should copy your set up

225/45/18 and 255/40/18

this should be pretty good comfortable.

It should, but the 8.5" rear rims (are you sure?) are quite thin for 255s... I don't know if that works.

[N8N]

I'm running 225/45r17 for the winter, they actually look good but the rear is definitely tucked up into the rear wheel well. Maybe I'm old but I don't get "stance" I like my suspension to work. I also don't really think 19s make a car look "sportier" when everyone's racing on 18s or even 17s. The downside to my winter setup is the speedo error; it is noticeable when I'm running trapster on my phone, and the 5 mph increments on the cruise control aren't useful anymore.

[demontwinz]

my wheels are 8.5 squared. i found a great deal on pss but if it won't fit...

[demontwinz]

according to tire Rack's Mich PSS

225/45/18 and 255/40/18 will fit 8.5 wheels.

Originally Posted by demontwinz

my wheels are 8.5 squared. i found a great deal on pss but if it won't fit...

So your wheels are squared but you want to run a staggered tire size?

Just pick one size, run them on all four, and be done with it.

[BASTOS HUMARUROT 335i]

@ who's your daddy? - Did you end up running the tire size set up you posted about?
@ meyergru - Your photo documented input about this topic is of big help in my deciding to run the same tire size set up. I'll be mounting Pirelli Sottozero Series II RFT (225/45-18 Fronts & 255/40-18 Rears) onto OEM BMW Style 313's that are on order. Any issues with rubbing when taking on 1-2 adult passengers in the back? Gary @ TIRERACK says using 225/45-18 at the front alone will result to rubbing. Could you confirm or comment to that? Cheers!

Quick links to proof it works:
http://www.treffbilder.de/show.php?s...sc01147adx.jpg
http://www.treffbilder.de/show.php?s...sc01149tft.jpg
http://www.treffbilder.de/show.php?s...sc01148hmb.jpg

The only E90POST member to have ran them successfully:
http://www.e90post.com/forums/showthread.php?t=142543

NOTE: There may be more who have ran this tyre size set up with success but failed to chime in about it.