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[austinla335d]

http://www.caranddriver.com/features...d-tires-tested

I can't find this article ANYWHERE on E90post but I originally saw it on a bmw forum, possibly not this one.

Anyhow, it is interesting to note that a lot of us spend a lot of money and even some time upgrading our vehicles for speed, mpg's, handling, etc. and don't consider this aspect enough.

According to this article which translates to basically any other vehicle fairly accurately, there is a definite consequence in going bigger, wider, (usually) heavier. A 0-60 dropping by 4%, a loss of 2mpg, a worse skidpad (18" vs 19") and so on.
Even if we drop 3lbs from each wheel, the tire might weigh 2lbs more, and since the tire is the outermost part of the wheel mass it probably translates to an overall more heavily weighted wheel/tire combo despite the lighter wheel weight.
When it comes to acceleration, braking, suspension responsiveness and of course, MPG, going big is counter-productive.

For the record, I'm on 19x9 and 19x10 AG M359's, but my 335d definitely felt quicker off the line on the stock wheels/tires, believe it or not. We are talking butt dyno, not facts and figures, but it is noticeable.

[IK6SPEED]

Originally Posted by austinla335d

http://www.caranddriver.com/features...d-tires-tested

I can't find this article ANYWHERE on E90post but I originally saw it on a bmw forum, possibly not this one.

Anyhow, it is interesting to note that a lot of us spend a lot of money and even some time upgrading our vehicles for speed, mpg's, handling, etc. and don't consider this aspect enough.

According to this article which translates to basically any other vehicle fairly accurately, there is a definite consequence in going bigger, wider, (usually) heavier. A 0-60 dropping by 4%, a loss of 2mpg, a worse skidpad (18" vs 19") and so on.
Even if we drop 3lbs from each wheel, the tire might weigh 2lbs more, and since the tire is the outermost part of the wheel mass it probably translates to an overall more heavily weighted wheel/tire combo despite the lighter wheel weight.
When it comes to acceleration, braking, suspension responsiveness and of course, MPG, going big is counter-productive.

For the record, I'm on 19x9 and 19x10 AG M359's, but my 335d definitely felt quicker off the line on the stock wheels/tires, believe it or not. We are talking butt dyno, not facts and figures, but it is noticeable.

so what would the optimal wheel size for our cars be? 18x8.5 and 18x9.5?

[bmw325i]

Originally Posted by igor_ki

so what would the optimal wheel size for our cars be? 18x8.5 and 18x9.5?

How the wheel is made makes a difference as well. A forged wheel is usually lighter than a cast wheel. I really don't think it makes much of a difference though.

[IK6SPEED]

What about apex wheels? I heard theyre strong but not forged

[TokyoCarGuy]

I think for BMW there will always be improvement in ride quality and handling as with replacement rims comes standard rubber to replace the harsh and heavy RFT's.

Originally Posted by igor_ki

so what would the optimal wheel size for our cars be? 18x8.5 and 18x9.5?

It depends on what you're trying to accomplish. There is no "optimal" tires size when you're trying to put a check box in every single category (performance, looks, price, etc.)

[007_e350]

Wait 19" would weigh heavier than 18" overall ? by how much ??? (with tires)
Say:
Stock 162 18": front = 24 lbs, rear = 26 lbs

If I were to pick MRR GF07 fronts are 27, rear 29 - how much is the actual delta going to be with PSS tires

[bmw325i]

Originally Posted by 007_e350

Wait 19" would weigh heavier than 18" overall ? by how much ??? (with tires)
Say:
Stock 162 18": front = 24 lbs, rear = 26 lbs

If I were to pick MRR GF07 fronts are 27, rear 29 - how much is the actual delta going to be with PSS tires

It depends. A lightweight, forged 19" wheel can weigh less than a heavy, cast 18" wheel. Apex wheels are flow forged and a good deal for the price.

[007_e350]

Originally Posted by bmw325i

It depends. A lightweight, forged 19" wheel can weigh less than a heavy, cast 18" wheel. Apex wheels are flow forged and a good deal for the price.

Where can I but apex, they don't appear to be on ebay, elementwheels.con etc

Originally Posted by 007_e350

Where can I but apex, they don't appear to be on ebay, elementwheels.con etc

http://bit.ly/1xDGrOE

[007_e350]

Originally Posted by FCobra94

http://bit.ly/1xDGrOE

doesnt show 19s A n y w h e r e

Originally Posted by 007_e350

doesnt show 19s A n y w h e r e

That's because they are not available yet!!!1!1!

S E A R C H I N G + R E A D I N G = S U C C E S S
http://www.myapexparts.com/2014/05/2...rc-8-wheels-2/

Got any other questions google can answer?

[bmw325i]

Originally Posted by FCobra94

That's because they are not available yet!!!1!1!

S E A R C H I N G + R E A D I N G = S U C C E S S
http://www.myapexparts.com/2014/05/2...rc-8-wheels-2/

Got any other questions google can answer?

LMAO

[lonestar22]

This doesn't apply to our cars as much because you must remember how heavy those run flats are