[x.shell]

First I want to say that this is a serious question for RWD F30s.

What are the pros/cons of running a staggered diameter set up as long as the overall diameter of the wheel/tire combo is the same?

I've search the internet and this forum about it, but there isn't a lot of smart and informed information on the topic. I'm itching to try out a 19" on the front with a 20" rear set up. My reasons are as follows.

• The ride comfort of a larger side wall for the front is important to me than the rear.
  
• However, the bulkier rear quarter of the F30 lends for a bigger wheel to balance it out visually.

My concern isn't peak performance at the track. The concern has more to do with comfort and visual balance. Let me know what you think (unless it has anything to do with "What is this? A muscle car forum?").

[richb811]

I don't see why it would be a problem so long as the overall diameters are the same.

[gonein10]

other than the visual aspect there would be no adverse affect. The beauty of RWD over AWD

[x.shell]

There's no turning back now. I just ordered some 19s for the front and 20s for the rear.

[AMJAM]

Originally Posted by ex º

There's no turning back now. I just ordered some 19s for the front and 20s for the rear.

I am really interested to see what it looks like I think you may well have stumbled on something really good

[.BMW.]

Originally Posted by AMJAM

I am really interested to see what it looks like I think you may well have stumbled on something really good

Very interesting!

Don't forget to post pics when you have mounted up your new wheels!

[x.shell]

Wheels arrived today. They aren't bad looking.

19x8.5 Offset 35
20x10 Offset 40

Now I have to find some tires.

[BaLLzZz]

cant wait to see

[AMJAM]

Looking forward to seeing them mounted

[richb811]

Pics or it didn't happen!

[x.shell]

Okay ordered some Hankook V12s. 245/40/19 front + 275/30/20 rear.

[amf]

you overnighted the tires right? can't wait to see this!!!

[x.shell]

Originally Posted by amf

you overnighted the tires right? can't wait to see this!!!

Tire shop has them in stock. I reserved them. I will probably go in tomorrow to get them mounted. I'll post up pics as soon as I get to taking the photos.

[x.shell]

I apologize for the phone photo. And I know the car is dirty.

Here are my initial thoughts. I think the 20 inch is a bit too aggressive while the 19 inch is too subdued. The 275/30/20 Hankook does rub the inner liner when the suspension is compressed. I may have to get the camber adjusted to compensate. The width is 10 inch with a offset of 40. The rear tires are inflated to 40psi; I may bring it down to 38psi. I The front is kind of bland but no rubbing issues. I may get a 5mm spacer for the front. The front tires are inflated to 38psi; I will most likely bring it down to 35psi.

I will post up better photos when I get the car detailed.

For the small percentage of people that were wondering about this set up, I hope this was helpful. I just thought I'd give it a shot. I'm not sure if I like it, but it's not too bad.

[PrinceBarin]

Kudos for even attempting this and thanks especially for sharing. If you can get the car valeted before the next set of pics I'm sure it would help

How noticeable is the difference irl? Maybe it's just me but from this pic I'm not sure I'd have clocked the difference if I didn't already know.

Are you going to stick with it?

[x.shell]

Originally Posted by PrinceBarin

Kudos for even attempting this and thanks especially for sharing. If you can get the car valeted before the next set of pics I'm sure it would help

How noticeable is the difference irl? Maybe it's just me but from this pic I'm not sure I'd have clocked the difference if I didn't already know.

Are you going to stick with it?

In real life the difference is pretty noticeable because of the difference in concavity and tire side wall. If the front was a 19x9 instead of the 19x8.5, it would help hide the difference more. For the next round of tires, I'll probably get a taller rear tire or a less aggressive front tire; this would balance it out more successfully.

Here is another picture I just took. The car is nice and clean now.

[richb811]

It definitely does make a visible difference in the rear. That rear looks a lot more pronounced and "Purposeful" now.

I like it! for attempting it!

[.BMW.]

Originally Posted by ex o

In real life the difference is pretty noticeable because of the difference in concavity and tire side wall. If the front was a 19x9 instead of the 19x8.5, it would help hide the difference more. For the next round of tires, I'll probably get a taller rear tire or a less aggressive front tire; this would balance it out more successfully.

I really like how it looks, glad you pursued your idea!

But as you say, the front tire side wall is noticeable higher. A front tire with slightly more stretch in combination with a taller rear tire should help to improve the look even further.

[.BMW.]

Forgot to ask, which tire sizes did you choose front and rear?

Edit: Found info about tire sizes in one of your previous posts

[AMJAM]

I have to say I think this could look even better. Personally I would get a smaller tyre in the rear say a 265 or 255 I actually have a 255 on my 20x10 and I would lower it more. If you look at the muscle cars that run these different diameters they are always lower. Honestly if you do this I really think you have created something really good