Sponsored by The Tire Rack

[IBOOSTU]

Originally Posted by bmw325i

Yes going up to the 45 profile from 40 would mean you are going 2mph faster than you think. But the stock speedometer reads 3mph higher than your actual speed.

So if it says 63 you are really going 60 with stock tires and 62 with the taller tires.

can i go 235/40/18 and 265/40/18?

[bmw325i]

Originally Posted by IBOOSTU

can i go 235/40/18 and 265/40/18?

The rear tire is taller than the front 265/35/18 is the proper size.

[trav00]

Wow I just came back from a little mini vacation to TONS of info on the topic. I just want to thank everyone that has contributed all of this info it means a lot to me.

Let me get reading I haven't even read everything yet.

Thank you!

[trav00]

Originally Posted by dbjb

When one gets a larger wheel, typically the tire gets a lower profile so that the total diameter is the same as the original tire.

For example, 225/40/18 becomes 235/35/19. So the tire isn't any meatier. It's actually thinner. The only way to reduce the appearance of gap is with spacers, pushing the wheel out further which gives some illusion that the gap is lessened or truly reduce gap through lowering springs.

Make sense?

yes it certainly does. thank you for the good reply!

[trav00]

Originally Posted by MonacoBlueE90

What you could do is use 225/45/18 and 255/40/18 with those 18x8 et34 and 18x8.5 et37. It's fine for xdrive the diameter difference is only 0.22% and since you aren't planning to lower the car i doubt there is going to be any rubbing issues. Here is a nice comparison with style 162 and stock vs. upsized tyres http://www.e90post.com/forums/showth...2#post14323772

Just remember those tyre sizes affect your speedo making it showing slower speed than you really are going, but in reality BMW's Speedo shows more than true speed from factory anyway. So it would be good idea to check with gps what's the true speed really is.

thank you for the reply and thats really interesting about the BMW speedo's not showing the true speed. i would have never known that

[MonacoBlueE90]

Originally Posted by trav00

thank you for the reply and thats really interesting about the BMW speedo's not showing the true speed. i would have never known that

Yeah, we had little bit of arguing about what happens to speedo, when upsized tyres are used. So there probably are some conflicting info. Truth is speedo shows more than true speed. You can code the digital speed hud to show the exact speed.

[mweisdorfer]

Your get more miles on your tires if you get a square set. Otherwise, you can't rotate your tires and that means you will be replacing them much more often.

e90's typically run about 3mph slow then true speed. 63 = 60 etc.

I agree with iboost, if you went up a profile in tire, you would probably cancel out this little misnomer.

Check these out before you make a final decision to buy.

This, I think is a square set up.

http://www.ebay.com/itm/18-M5-GUNMET...67242890&rt=nc

[trav00]

Originally Posted by MonacoBlueE90

Yeah, we had little bit of arguing about what happens to speedo, when upsized tyres are used. So there probably are some conflicting info. Truth is speedo shows more than true speed. You can code the digital speed hud to show the exact speed.

I actually have a buddy with an 09 m3 and he says him and people he know that have M's have read and debated that the digital tach is off as well. any info on that? thanks for the reply!

[MonacoBlueE90]

Originally Posted by trav00

I actually have a buddy with an 09 m3 and he says him and people he know that have M's have read and debated that the digital tach is off as well. any info on that? thanks for the reply!

Yes the digital speedo is off as well, but it can be coded to show true speed. Check number 79 from this document. https://docs.google.com/spreadsheet/...ext=true#gid=0

See sig for possible upsizing options.

It's true; stock speedo reads faster than you're actually going. With many smartphone apps being made available now and as cheap as stand alone GPS units are, why is this still a topic of debate? Either option will let you know EXACTLY how fast you're driving with any wheel/tire combination imaginable. It's not rocket surgery and peeps still fighting the truth are either dumb or just plain ignorant...either way, after using a GPS unit on my dash as well as road side radar based equipment, I can tell you that both my current wheel/tire setups read 100% accurate when compared to stock wheel/tire sizes at all speeds tested up to ~80 mph or so (which ends up being about 3-3.5% difference).

[trav00]

Originally Posted by MonacoBlueE90

Yes the digital speedo is off as well, but it can be coded to show true speed. Check number 79 from this document. https://docs.google.com/spreadsheet/...ext=true#gid=0

thanks brother you have been really helpful!

[bmw325i]

Originally Posted by mweisdorfer

Your get more miles on your tires if you get a square set. Otherwise, you can't rotate your tires and that means you will be replacing them much more often.

e90's typically run about 3mph slow then true speed. 63 = 60 etc.

I agree with iboost, if you went up a profile in tire, you would probably cancel out this little misnomer.

Check these out before you make a final decision to buy.

This, I think is a square set up.

http://www.ebay.com/itm/18-M5-GUNMET...67242890&rt=nc

Going up a profile would make it more accurate as long as you don't rub. Your odometer wouldn't be accurate anymore though. You would put less miles on your car than you actually drove

[paprmkr]

Originally Posted by trav00

Hey all I am brand new to this. Just picked up a 2011 335i xDrive. The car came with 17" wheels. I am looking at these 7 spoke 18's that come in 8" and 8.5" wide. I am totally sold on the oem sport suspension. It drives like a dream and I have no desire to change it. My goal is to decide to either get a square set up or go staggered with these 18" wheels. Another primary objective is to fill in the wheel gap with a meatier tire. I would also benefit form a meatier tire due to the condition of most roads here in NY.

Another factor- I purchased the wheel and tire protection plan for 5 years. Its to my understanding that as long as the wheels are OEM and under 21" and have the "original" tires on- I am warrantied. So I am unsure of tire options that are covered, as well as sizes. I am assuming run flats are my only choice for warranty coverage

Any advice would be great.

http://www.finishlinewheels.com/BMW/...11/A-59587U20/

Above is a link of the specific wheel I was referencing. Thank you

i have a set of oem style 197 chrome. excellent condition. no curb damage. where chromed one year ago.
size of wheel 18x8front, 18x8.5 rear
asking $400 plus shipping best if local in Socal. i can deliver.

[trav00]

Originally Posted by paprmkr

i have a set of oem style 197 chrome. excellent condition. no curb damage. where chromed one year ago.
size of wheel 18x8front, 18x8.5 rear
asking $400 plus shipping best if local in Socal. i can deliver.

hey buddy I am trying to PM you but its failing to send. I get an error message. Can you email me some photos to travisjohnt@gmail.com please. Thanks, we can go from there.

[paprmkr]

they are currently on car. i was suppose get my new wheels in today. now they say next week. but will send u pics asap