Anybody running a 245-40-17 tire on a 8" wide wheel?

[Jason5driver]

I need tires.
Badly.
I am wondering if guys have ran this tire size on a 17"x8" wheel?
I have OEM 17"x8" style 5's with 20mm offsets.

I found a good deal on some used tires, but the size is 245-40-17 = 24.7" outside diameter (O.D.)
I have 235-45-17 tires which = 25.4" outside diameter (OD)
So, that's about 3/4" of an inch difference...

If I do get these 245-40-17's, I would get another pair of 245-45-17's to make it a square setup.

Thoughts?
Discuss...

Thank you!
Jason

[sirius815]

That's not that big of a difference. You're speedo will be a little fast, meaning you'll be traveling a bit slower than what is is shown. Won't be that bad.

[Jason5driver]

That's not that big of a difference. You're speedo will be a little fast, meaning you'll be traveling a bit slower than what is is shown. Won't be that bad.

Right.
There will be a 3/4" of a difference between the OEM setup and the 245-40-17 size.
I would run 245-40-17 all around.

Things to consider are:
1. Steering response slowed
2. Overall diameter less = more tire rotations
3. Weight - the 245-40-17 tires are heavier than the stock OEM sizes (235-45-17).

Thanks!
Jason

[PFunk242]

I have 245 40 17's on 7.5 wheels with no problems. Tread is flat in the center of the tire also.

[Jason5driver]

I have 245 40 17's on 7.5 wheels with no problems. Tread if flat in the center of the tire also.

That's interesting.
I will have to see some pictures!

What are you trying to say here?:

Tread if flat in the center of the tire also.

[Ztrim3]

Not 17s, but I've been running 245 40 18s on my front two rims for about a year with no problems. I cant really comment on the steering response because I've been running this size since I bought the rims. They do bulge just a little bit but the tread is even and I see no stress marks of any kind. I have 9's in the back running 255-35s and the sidewalls seem much firmer..Next time I buy tires I think I'll try 245 35s but the 245 40s are fine. Just my 2 cents. Sweet car btw, coilovers?

[Jason5driver]

Not 17s, but I've been running 245 40 18s on my front two rims for about a year with no problems. I cant really comment on the steering response because I've been running this size since I bought the rims. They do bulge just a little bit but the tread is even and I see no stress marks of any kind. I have 9's in the back running 255-35s and the sidewalls seem much firmer..Next time I buy tires I think I'll try 245 35s but the 245 40s are fine. Just my 2 cents. Sweet car btw, coilovers?

Thanks.
But, 245-40-18 is normal for an 18"x8.5" wheel.

Thanks, yes, I have coil-overs.
Ref. here:
http://forums.bimmerforums.com/forum/showthread.php?t=1379498

[QuestMCoupe]

I run 245/40/17 on my front wheels on the Coupe. No problems. Has a fuller look to it IMO.

[Jason5driver]

I run 245/40/17 on my front wheels on the Coupe. No problems. Has a fuller look to it IMO.

Right.
I am wondering if I will need to lower the car more, since the 245's will be approx. 0.75" smaller than my 235's...?

The fender gap between the tire will be increased.

[QuestMCoupe]

Good question. Good thing you have to ability to adjust the gap.

[Jason5driver]

Good question. Good thing you have to ability to adjust the gap.

Thanks!

True, I do have the ability to adjust the heights.
Although, I have to be careful not lower the car too much, because I could ground out.